Usenet 1994 October/usenetsourcesnewsgroupsinfomagicoctober1994disk2.iso/misc/volume21/rayshade/part06

LaTeX Document | 1991-07-21 | 56KB | 1,731 lines

Newsgroups: comp.sources.misc
From: Rayshade Construction Co. <[e-mail]>
Subject:  v21i009:  rayshade - A raytracing package for UNIX, Part06/19
Message-ID: <[e-mail]>
X-Md4-Signature: 9460758b6d1b7446ee76a8e036ff510a
Date: Sat, 20 Jul 1991 04:34:56 GMT
Approved: [e-mail]
Submitted-by: Rayshade Construction Co. <[e-mail]>
Posting-number: Volume 21, Issue 9
Archive-name: rayshade/part06
Environment: UNIX, !16BIT
#! /bin/sh
# This is a shell archive.  Remove anything before this line, then unpack
# it by saving it into a file and typing "sh file".  To overwrite existing
# files, type "sh file -c".  You can also feed this as standard input via
# unshar, or by typing "sh <file", e.g..  If this archive is complete, you
# will see the following message at the end:
#        "End of archive 6 (of 19)."
# Contents:  Doc/Guide/intro.tex Examples/planet.map
#   libray/liblight/extended.c libray/libobj/hf.h libray/libobj/list.c
#   libray/libobj/plane.c libray/libsurf/fogdeck.c
#   libray/libtext/cloud.c libray/libtext/stripe.c
#   libshade/Makefile.SH libshade/surfdef.c raypaint/Makefile.SH
#   raypaint/glgraphics.c raypaint/main.c rayshade/Makefile.SH
#   rayview/Makefile.SH
# Wrapped by kolb@woody on Wed Jul 17 17:56:45 1991
PATH=/bin:/usr/bin:/usr/ucb ; export PATH
if test -f 'Doc/Guide/intro.tex' -a "${1}" != "-c" ; then
  echo shar: Will not clobber existing file \"'Doc/Guide/intro.tex'\"
echo shar: Extracting \"'Doc/Guide/intro.tex'\" \(2585 characters\)
sed "s/^X//" >'Doc/Guide/intro.tex' <<'END_OF_FILE'
X\chapter{Introduction}
X\pagenumbering{arabic}
XThis document describes \rayshade in enough detail to enable
Xthe technical-minded to
Xsit down and render some images.  In its current form,
Xit is truly a draft, and even then
Xmore of a reference manual than a proper user's guide.
XThis document does not provide any kind of thorough introduction
Xto the basics of computer graphics or ray tracing.
XThere are many other excellent sources for this kind of information.
XThe technical and coding details of \rayshade and
Xits libraries will be documented elsewhere.
X\section{Getting Started}
XThe best way to learn how to use \rayshade is to dive right in and
Xstart making pictures.  Study the example
Xinput files that are packaged with {\em rayshade}.  Run them through
Xrayshade to see what the images they produce look like.
XChange the input files; move the camera,
Xchange the field of view, modify surface properties, and see what differences
Xyour changes make, all the while referring to the appropriate portions
Xof this document.  Browse through the individual chapters
Xto see what \rayshade can and cannot do.  The \rayshade quick reference
Xguide may also help you sort out syntactical nasties.
XThroughout this text, the {\tt typewriter} type style is used to indicate
Xkeywords and other items that should be passed
Xdirectly {\em rayshade}.  Where appropriate,
Xitems in an {\em italic\/} style indicate
Xplaces where you should provide an appropriate number or string.
XVectors, which consist of three numerical values, are indicated by
Xan arrow over a name written in italic type style, e.g., \evec{vector}.
XItems enclosed between {\tt [} and {\tt ]} characters indicate
Xthat specifying those items is optional.
XComplex constructions that are
Xdescribed elsewhere in the text, such as surface or object specification,
Xare denoted by enclosing descriptive text between
X{\tt $<$} and {\tt $>$} characters.
X\section{A Simple Example}
XBecause \rayshade provides a default camera description, surface properties,
Xand a default light
Xsource, it is easy to construct short input files that allow you to
Xexperiment with objects, textures, and transformations.
XIf you haven't already run \rayshade on one of the example input files,
Xyou might want to try producing an image using the following input:
X\begin{verbatim}
X   sphere 2 0 0 0
X\end{verbatim}
XIf you are running \rayshade on a UNIX\footnote{UNIX is a trademark
Xof AT\&T Bell Laboratories}-like machine, the command:
X\begin{verbatim}
X  echo "sphere 2 0 0 0" | rayshade > sphere.rle
X\end{verbatim}
Xshould produce an image of a sphere.
END_OF_FILE
if test 2585 -ne `wc -c <'Doc/Guide/intro.tex'`; then
    echo shar: \"'Doc/Guide/intro.tex'\" unpacked with wrong size!
# end of 'Doc/Guide/intro.tex'
if test -f 'Examples/planet.map' -a "${1}" != "-c" ; then
  echo shar: Will not clobber existing file \"'Examples/planet.map'\"
echo shar: Extracting \"'Examples/planet.map'\" \(2551 characters\)
sed "s/^X//" >'Examples/planet.map' <<'END_OF_FILE'
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END_OF_FILE
if test 2551 -ne `wc -c <'Examples/planet.map'`; then
    echo shar: \"'Examples/planet.map'\" unpacked with wrong size!
# end of 'Examples/planet.map'
if test -f 'libray/liblight/extended.c' -a "${1}" != "-c" ; then
  echo shar: Will not clobber existing file \"'libray/liblight/extended.c'\"
echo shar: Extracting \"'libray/liblight/extended.c'\" \(2819 characters\)
sed "s/^X//" >'libray/liblight/extended.c' <<'END_OF_FILE'
X * extended.c
X * Copyright (C) 1989, 1991, Craig E. Kolb
X * All rights reserved.
X * This software may be freely copied, modified, and redistributed
X * provided that this copyright notice is preserved on all copies.
X * You may not distribute this software, in whole or in part, as part of
X * any commercial product without the express consent of the authors.
X * There is no warranty or other guarantee of fitness of this software
X * for any purpose.  It is provided solely "as is".
X * $Id: extended.c,v 4.0 91/07/17 14:34:03 kolb Exp Locker: kolb $
X * $Log:    extended.c,v $
X * Revision 4.0  91/07/17  14:34:03  kolb
X * Initial version.
X#include "light.h"
X#include "libcommon/sampling.h"
X#include "extended.h"
Xstatic LightMethods *iExtendedMethods = NULL;
XExtended *
XExtendedCreate(r, pos)
XFloat r;
XVector *pos;
X    Extended *e;
X    e = (Extended *)share_malloc(sizeof(Extended));
X    e->pos = *pos;
X    e->radius = r;
X    return e;
XLightMethods *
XExtendedMethods()
X    if (iExtendedMethods == (LightMethods *)NULL) {
X        iExtendedMethods = LightMethodsCreate();
X        iExtendedMethods->intens = ExtendedIntens;
X        iExtendedMethods->dir = ExtendedDirection;
X    return iExtendedMethods;
X * Compute intensity ('color') of extended light source 'lp' from 'pos'.
Xstatic int
XExtendedIntens(lp, lcolor, cache, ray, dist, noshadow, color)
XExtended *lp;
XColor *lcolor, *color;
XShadowCache *cache;
XRay *ray;
XFloat dist;
Xint noshadow;
X    int uSample, vSample, islit;
X    Float jit, vbase, ubase, vpos, upos, lightdist;
X    Color newcol;
X    Ray newray;
X    Vector Uaxis, Vaxis, ldir;
X    if (noshadow) {
X        *color = *lcolor;
X        return TRUE;
X    newray = *ray;
X     * Determinte two orthoganal vectors that lay in the plane
X     * whose normal is defined by the vector from the center
X     * of the light source to the point of intersection and
X     * passes through the center of the light source.
X      */
X    VecSub(lp->pos, ray->pos, &ldir);
X    VecCoordSys(&ldir, &Uaxis, &Vaxis);
X    jit = 2. * lp->radius * Sampling.spacing;
X     * Sample a single point, determined by SampleNumber,
X     * on the extended source.
X     */
X    vpos = -lp->radius + (ray->sample % Sampling.sidesamples)*jit;
X    upos = -lp->radius + (ray->sample / Sampling.sidesamples)*jit;
X    vpos += nrand() * jit;
X    upos += nrand() * jit;
X    VecComb(upos, Uaxis, vpos, Vaxis, &newray.dir);
X    VecAdd(ldir, newray.dir, &newray.dir);
X    lightdist = VecNormalize(&newray.dir);
X    return !Shadowed(color, lcolor, cache, &newray,
X        lightdist, noshadow);
Xvoid
XExtendedDirection(lp, pos, dir, dist)
XExtended *lp;
XVector *pos, *dir;
XFloat *dist;
X     * Calculate dir from position to center of
X     * light source.
X     */
X    VecSub(lp->pos, *pos, dir);
X    *dist = VecNormalize(dir);
XExtendedMethodRegister(meth)
XUserMethodType meth;
X    if (iExtendedMethods)
X        iExtendedMethods->user = meth;
END_OF_FILE
if test 2819 -ne `wc -c <'libray/liblight/extended.c'`; then
    echo shar: \"'libray/liblight/extended.c'\" unpacked with wrong size!
# end of 'libray/liblight/extended.c'
if test -f 'libray/libobj/hf.h' -a "${1}" != "-c" ; then
  echo shar: Will not clobber existing file \"'libray/libobj/hf.h'\"
echo shar: Extracting \"'libray/libobj/hf.h'\" \(2626 characters\)
sed "s/^X//" >'libray/libobj/hf.h' <<'END_OF_FILE'
X * hf.h
X * Copyright (C) 1989, 1991, Craig E. Kolb
X * All rights reserved.
X * This software may be freely copied, modified, and redistributed
X * provided that this copyright notice is preserved on all copies.
X * You may not distribute this software, in whole or in part, as part of
X * any commercial product without the express consent of the authors.
X * There is no warranty or other guarantee of fitness of this software
X * for any purpose.  It is provided solely "as is".
X * $Id: hf.h,v 4.0 91/07/17 14:38:19 kolb Exp Locker: kolb $
X * $Log:    hf.h,v $
X * Revision 4.0  91/07/17  14:38:19  kolb
X * Initial version.
X#ifndef HF_H
X#define HF_H
X#define GeomHfCreate(f) GeomCreate((GeomRef)HfCreate(f), HfMethods())
X * Any height values <= Hf_UNSET is not considered to be part of the
X * height field. Any trianges containing such a vertex will not be
X * rendered.  This allows one to render non-square height fields.
X#define HF_UNSET        (-1000.)
X * Number of datapoints in a single cell.  If you've got loads of memory,
X * decrease this number.  The 'optimal' number is quite system-dependent,
X * but something around 20 seems to work well. For systems without much
X * memory, this constant should be greater than or equal to the largest
X * height field which will be rendered, thus making the algorithm
X * non-hierarchical.
X#define BESTSIZE        16
X * Size of triangle cache.
X#define CACHESIZE        6
X * Used to differentiate between the two triangles used to represent a cell:
X *    a------d
X *      |\     |
X *      | \TRI2|    TRI2 == c-->d-->a-->c
X *      |  \   |
X *      |   \  |
X *    |    \ |
X *      |TRI1 \|    TRI1 == c-->a-->b-->c
X *      b------c
X#define TRI1            1
X#define TRI2            2
Xtypedef struct hfTri {
X    Vector v1, v2, v3, norm;
X    Float d;
X    char type;
X    struct hfTri *next, *prev;
X} hfTri;
Xtypedef struct {
X    int len;
X    hfTri *head, *tail;
X} TriQueue;
Xtypedef struct {
X    float **data;        /* Altitude points */
X    float minz, maxz;
X    int size, *lsize;    /* # of points/side */
X    int BestSize;         /* "best" division size */
X    float iBestSize;    /* inverse of above (for faster computation) */
X    int levels;        /* log base BestSize of size */
X    float ***boundsmax;    /* high data values at various resolutions. */
X    float ***boundsmin;
X    float *spacing;
X    hfTri hittri, **q;    /* hit triangle and triangle cache */
X    int qtail, qsize;    /* end and length of cache */
X    Float boundbox[2][3];    /* bounding box of Hf */
X} Hf;
Xextern Hf    *HfCreate();
Xextern int    HfIntersect(), HfEnter(), HfNormal();
Xextern void    HfBounds(), HfUV(), HfStats();
Xextern char    *HfName();
Xextern Methods    *HfMethods();
X#endif /* HF_H */
END_OF_FILE
if test 2626 -ne `wc -c <'libray/libobj/hf.h'`; then
    echo shar: \"'libray/libobj/hf.h'\" unpacked with wrong size!
# end of 'libray/libobj/hf.h'
if test -f 'libray/libobj/list.c' -a "${1}" != "-c" ; then
  echo shar: Will not clobber existing file \"'libray/libobj/list.c'\"
echo shar: Extracting \"'libray/libobj/list.c'\" \(3113 characters\)
sed "s/^X//" >'libray/libobj/list.c' <<'END_OF_FILE'
X * list.c
X * Copyright (C) 1989, 1991, Craig E. Kolb
X * All rights reserved.
X * This software may be freely copied, modified, and redistributed
X * provided that this copyright notice is preserved on all copies.
X * You may not distribute this software, in whole or in part, as part of
X * any commercial product without the express consent of the authors.
X * There is no warranty or other guarantee of fitness of this software
X * for any purpose.  It is provided solely "as is".
X * $Id: list.c,v 4.0 91/07/17 14:38:42 kolb Exp Locker: kolb $
X * $Log:    list.c,v $
X * Revision 4.0  91/07/17  14:38:42  kolb
X * Initial version.
X#include "geom.h"
X#include "list.h"
Xstatic Methods *iListMethods = NULL;
Xstatic char listName[] = "list";
XList *
XListCreate()
X    return (List *)share_calloc(1, sizeof(List));
Xchar *
XListName()
X    return listName;
X * Take a list whose DATA field points to a linked list of objects and
X * turn it into a List.
XListConvert(list, objlist)
XList *list;
XGeom *objlist;
X    int num;
X     * Find the unbounded objects on the list as well as the
X     * bounding box of the list.
X     */
X    list->list = objlist;
X    for (num = 0; objlist; objlist = objlist->next)
X        num += objlist->prims;
X    return num;
X * Intersect ray & list of objects.
XListIntersect(list, ray, hitlist, mindist, maxdist)
XList *list;
XRay *ray;
XHitList *hitlist;
XFloat mindist, *maxdist;
X    Geom *objlist;
X    Vector vtmp;
X    Float s;
X    int hit;
X    hit = FALSE;
X     * Intersect with unbounded objects.
X     */
X    for (objlist = list->unbounded; objlist ; objlist = objlist->next) {
X        if (intersect(objlist, ray, hitlist, mindist, maxdist))
X            hit = TRUE;
X     * Check for intersection with bounding box.
X     */
X    s = *maxdist;    /* So maxdist won't be reset. */
X    VecAddScaled(ray->pos, mindist, ray->dir, &vtmp);
X    if (OutOfBounds(&vtmp, list->bounds) &&
X        !BoundsIntersect(ray, list->bounds, mindist, &s))
X        /*
X         * Ray never hit list.
X         */
X        return hit;
X     * Else the ray enters list-space before it hits an
X     * unbounded object. Intersect with objects on list.
X     */
X    for (objlist = list->list; objlist ; objlist = objlist->next) {
X        if (intersect(objlist, ray, hitlist, mindist, maxdist))
X            hit = TRUE;
X    return hit;
XMethods *
XListMethods()
X    if (iListMethods == (Methods *)NULL) {
X        iListMethods = MethodsCreate();
X        iListMethods->methods = ListMethods;
X        iListMethods->create = (GeomCreateFunc *)ListCreate;
X        iListMethods->name = ListName;
X        iListMethods->intersect = ListIntersect;
X        iListMethods->bounds = ListBounds;
X        iListMethods->convert = ListConvert;
X        iListMethods->checkbounds = FALSE;
X        iListMethods->closed = TRUE;
X    return iListMethods;
Xvoid
XListBounds(list, bounds)
XList *list;
XFloat bounds[2][3];
X    Geom *obj, *next;
X    BoundsInit(list->bounds);
X     * For each object on the list,
X     * compute its bounds...
X     */
X    list->unbounded  = GeomComputeAggregateBounds(&list->list,
X                list->unbounded, list->bounds);
X    BoundsCopy(list->bounds, bounds);
Xvoid
XListMethodRegister(meth)
XUserMethodType meth;
X    if (iListMethods)
X        iListMethods->user = meth;
END_OF_FILE
if test 3113 -ne `wc -c <'libray/libobj/list.c'`; then
    echo shar: \"'libray/libobj/list.c'\" unpacked with wrong size!
# end of 'libray/libobj/list.c'
if test -f 'libray/libobj/plane.c' -a "${1}" != "-c" ; then
  echo shar: Will not clobber existing file \"'libray/libobj/plane.c'\"
echo shar: Extracting \"'libray/libobj/plane.c'\" \(2991 characters\)
sed "s/^X//" >'libray/libobj/plane.c' <<'END_OF_FILE'
X * plane.c
X * Copyright (C) 1989, 1991, Craig E. Kolb
X * All rights reserved.
X * This software may be freely copied, modified, and redistributed
X * provided that this copyright notice is preserved on all copies.
X * You may not distribute this software, in whole or in part, as part of
X * any commercial product without the express consent of the authors.
X * There is no warranty or other guarantee of fitness of this software
X * for any purpose.  It is provided solely "as is".
X * $Id: plane.c,v 4.0 91/07/17 14:38:51 kolb Exp Locker: kolb $
X * $Log:    plane.c,v $
X * Revision 4.0  91/07/17  14:38:51  kolb
X * Initial version.
X#include "geom.h"
X#include "plane.h"
Xstatic Methods *iPlaneMethods = NULL;
Xstatic char planeName[] = "plane";
Xunsigned long PlaneTests, PlaneHits;
X * create plane primitive
XPlane *
XPlaneCreate(pos, norm)
XVector *pos, *norm;
X    Plane *plane;
X    Vector tmpnrm;
X    tmpnrm = *norm;
X    if (VecNormalize(&tmpnrm) == 0.) {
X        RLerror(RL_WARN, "Degenerate plane normal.\n");
X        return (Plane *)NULL;
X    plane = (Plane *)share_malloc(sizeof(Plane));
X    plane->norm = tmpnrm;
X    plane->pos = *pos;
X    plane->d = dotp(&plane->norm, pos);
X    return plane;
XMethods *
XPlaneMethods()
X    if (iPlaneMethods == (Methods *)NULL) {
X        iPlaneMethods = MethodsCreate();
X        iPlaneMethods->name = PlaneName;
X        iPlaneMethods->create = (GeomCreateFunc *)PlaneCreate;
X        iPlaneMethods->methods = PlaneMethods;
X        iPlaneMethods->intersect = PlaneIntersect;
X        iPlaneMethods->normal = PlaneNormal;
X        iPlaneMethods->uv = PlaneUV;
X        iPlaneMethods->bounds = PlaneBounds;
X        iPlaneMethods->stats = PlaneStats;
X        iPlaneMethods->checkbounds = FALSE;
X        iPlaneMethods->closed = FALSE;
X    return iPlaneMethods;
XPlaneIntersect(plane, ray, mindist, maxdist)
XPlane *plane;
XRay *ray;
XFloat mindist, *maxdist;
X    Float d;
X    PlaneTests++;
X    d = dotp(&plane->norm, &ray->dir);
X    if (fabs(d) < EPSILON)
X        return FALSE;
X    d = (plane->d - dotp(&plane->norm, &ray->pos)) / d;
X    if (d > mindist && d < *maxdist) {
X        *maxdist = d;
X        PlaneHits++;
X        return TRUE;
X    return FALSE;
X/*ARGSUSED*/
XPlaneNormal(plane, pos, nrm, gnrm)
XPlane *plane;
XVector *pos, *nrm, *gnrm;
X    *gnrm = *nrm = plane->norm;
X    return FALSE;
Xvoid
XPlaneUV(plane, pos, norm, uv, dpdu, dpdv)
XPlane *plane;
XVector *pos, *norm, *dpdu, *dpdv;
XVec2d *uv;
X    Vector vec, du, dv;
X    VecCoordSys(norm, &du, &dv);
X    VecSub(*pos, plane->pos, &vec);
X    uv->u = dotp(&vec, &du);
X    uv->v = dotp(&vec, &dv);
X    if (dpdu)
X        *dpdu = du;
X    if (dpdv)
X        *dpdv = dv;
X/*ARGSUSED*/
Xvoid
XPlaneBounds(plane, bounds)
XPlane *plane;
XFloat bounds[2][3];
X     * Planes are unbounded by nature.  minx > maxx signifies
X     * this.
X     */
X    bounds[LOW][X] = 1.0;
X    bounds[HIGH][X] = -1.0;
Xchar *
XPlaneName()
X    return planeName;
Xvoid
XPlaneStats(tests, hits)
Xunsigned long *tests, *hits;
X    *tests = PlaneTests;
X    *hits = PlaneHits;
Xvoid
XPlaneMethodRegister(meth)
XUserMethodType meth;
X    if (iPlaneMethods)
X        iPlaneMethods->user = meth;
END_OF_FILE
if test 2991 -ne `wc -c <'libray/libobj/plane.c'`; then
    echo shar: \"'libray/libobj/plane.c'\" unpacked with wrong size!
# end of 'libray/libobj/plane.c'
if test -f 'libray/libsurf/fogdeck.c' -a "${1}" != "-c" ; then
  echo shar: Will not clobber existing file \"'libray/libsurf/fogdeck.c'\"
echo shar: Extracting \"'libray/libsurf/fogdeck.c'\" \(2785 characters\)
sed "s/^X//" >'libray/libsurf/fogdeck.c' <<'END_OF_FILE'
X * fogdeck.c
X * Copyright (C) 1989, 1991, Craig E. Kolb
X * All rights reserved.
X * This software may be freely copied, modified, and redistributed
X * provided that this copyright notice is preserved on all copies.
X * You may not distribute this software, in whole or in part, as part of
X * any commercial product without the express consent of the authors.
X * There is no warranty or other guarantee of fitness of this software
X * for any purpose.  It is provided solely "as is".
X * $Id: fogdeck.c,v 4.0 91/07/17 14:40:28 kolb Exp Locker: kolb $
X * $Log:    fogdeck.c,v $
X * Revision 4.0  91/07/17  14:40:28  kolb
X * Initial version.
X#include "atmosphere.h"
X#include "fogdeck.h"
XFogdeck *
XFogdeckCreate(alt, offset, scale, chaoscale, octaves, color, trans)
XFloat alt, offset, chaoscale;
XVector *scale;
Xint octaves;
XColor *color, *trans;
X    Fogdeck *fogdeck;
X    static void ComputeFogdeck();
X    fogdeck = (Fogdeck *)Malloc(sizeof(Fogdeck));
X    fogdeck->alt = alt;
X    fogdeck->octaves = octaves;
X    fogdeck->scale = *scale;
X    fogdeck->chaoscale = chaoscale;
X    fogdeck->offset = offset;
X    if (color == (Color *)NULL)
X        fogdeck->color.r = fogdeck->color.g = fogdeck->color.b = 0.;
X    else
X        fogdeck->color = *color;
X    if (trans == (Color *)NULL)
X        fogdeck->trans.r = fogdeck->trans.g = fogdeck->trans.b =
X            FAR_AWAY;
X    else {
X        fogdeck->trans = *trans;
X    return fogdeck;
X * Add fogdeck to the given color.
Xvoid
XFogdeckApply(fogdeck, ray, pos, dist, color)
XFogdeck *fogdeck;
XRay *ray;
XVector *pos;
XFloat dist;
XColor *color;
X    Float atten, hitdist, density;
X    Color trans;
X    Vector endp;
X    extern Float ExpAtten(), PAChaos();
X     * Find distance from origin at which ray strikes
X     * z = fogdeck->alt plane
X     */
X    if (abs(ray->dir.z) < EPSILON)
X        return;
X    hitdist = (fogdeck->alt - ray->pos.z) / ray->dir.z;
X    if (hitdist < EPSILON || hitdist > dist)
X        return;
X     * Compute ray endpoint
X     */
X    VecAddScaled(ray->pos, hitdist, ray->dir, &endp);
X     * Modify transmissivity based on point of
X     * intersection.
X     */
X    endp.x *= fogdeck->scale.x;
X    endp.y *= fogdeck->scale.y;
X    endp.z *= fogdeck->scale.z;
X    density = fogdeck->offset +
X            fogdeck->chaoscale * PAChaos(&endp, fogdeck->octaves);
X    if (density < EPSILON)
X        density = HUGE;
X    else
X        density = 1. / density;
X    trans = fogdeck->trans;
X    ColorScale(density, trans, &trans);
X    dist -= hitdist;
X    atten = ExpAtten(dist, trans.r);
X    if (trans.r == trans.g &&
X        trans.r == trans.b) {
X        ColorBlend(color, &fogdeck->color, atten, 1. - atten);
X        return;
X    color->r = atten*color->r + (1. - atten) * fogdeck->color.r;
X    atten = ExpAtten(dist, trans.g);
X    color->g = atten*color->g + (1. - atten) * fogdeck->color.g;
X    atten = ExpAtten(dist, trans.b);
X    color->b = atten*color->b + (1. - atten) * fogdeck->color.b;
END_OF_FILE
if test 2785 -ne `wc -c <'libray/libsurf/fogdeck.c'`; then
    echo shar: \"'libray/libsurf/fogdeck.c'\" unpacked with wrong size!
# end of 'libray/libsurf/fogdeck.c'
if test -f 'libray/libtext/cloud.c' -a "${1}" != "-c" ; then
  echo shar: Will not clobber existing file \"'libray/libtext/cloud.c'\"
echo shar: Extracting \"'libray/libtext/cloud.c'\" \(2607 characters\)
sed "s/^X//" >'libray/libtext/cloud.c' <<'END_OF_FILE'
X * cloud.c
X * Copyright (C) 1989, 1991, Craig E. Kolb
X * All rights reserved.
X * This software may be freely copied, modified, and redistributed
X * provided that this copyright notice is preserved on all copies.
X * You may not distribute this software, in whole or in part, as part of
X * any commercial product without the express consent of the authors.
X * There is no warranty or other guarantee of fitness of this software
X * for any purpose.  It is provided solely "as is".
X * $Id: cloud.c,v 4.0 91/07/17 14:41:57 kolb Exp Locker: kolb $
X * $Log:    cloud.c,v $
X * Revision 4.0  91/07/17  14:41:57  kolb
X * Initial version.
X#include "texture.h"
X#include "cloud.h"
X * Gardner-style textured ellipsoid.  Designed to be used on unit spheres
X * centered at the origin.  (Of course, the spheres may be transformed
X * into ellipsoids, translated, etc.)
XCloudText *
XCloudTextCreate(scale, h, lambda, octaves, cthresh, lthresh, transcale)
XFloat scale, h, lambda, cthresh, lthresh, transcale;
Xint octaves;
X    CloudText *cloud;
X    cloud = (CloudText *)Malloc(sizeof(CloudText));
X    cloud->beta = 1. + 2 * h;
X    cloud->omega = pow(lambda, -0.5 * cloud->beta);
X    cloud->lambda = lambda;
X    cloud->scale = scale;
X    cloud->cthresh = cthresh;
X    cloud->range = lthresh - cthresh;
X    cloud->transcale = transcale;
X    cloud->maxval = 1. / (1. - cloud->beta);
X    cloud->octaves = octaves;
X    return cloud;
Xvoid
XCloudTextApply(cloud, prim, ray, pos, norm, gnorm, surf)
XCloudText *cloud;
XGeom *prim;
XRay *ray;
XVector *pos, *norm, *gnorm;
XSurface *surf;
X    Ray pray;
X    Float alpha, beta, It, dsquared, d, limb;
X     * Transform ray to prim. space.
X     */
X    pray = *ray;
X    (void)TextRayToPrim(&pray);
X    dsquared = dotp(&pray.pos, &pray.pos);
X    if (fabs(dsquared) < 1. + EPSILON) {
X        surf->transp = 1.;
X        surf->amb.r = surf->amb.g = surf->amb.b = 0.;
X        surf->diff.r = surf->diff.g = surf->diff.b = 0.;
X        return;
X    It = fBm(pos,cloud->omega,cloud->lambda,cloud->octaves);
X    It = (cloud->maxval + It) * 0.5/cloud->maxval;
X    if (It < 0.)
X        It = 0;
X    else if (It > 1.)
X        It = 1;
X    d = sqrt(dsquared);
X    beta = sqrt(dsquared - 1) / d;
X    alpha = -dotp(&pray.pos, &pray.dir) / d;
X    limb = (alpha - beta) / (1 - beta);
X     * limb is 0 on the limb, 1 at the center, < 1 outside.
X     */
X    surf->transp = 1. - (It-cloud->cthresh-cloud->range*(1.-limb))/
X            cloud->transcale;
X    if (surf->transp > 1)
X        surf->transp = 1.;
X    if (surf->transp < 0)
X        surf->transp = 0.;
X    ColorScale((1. - surf->transp) *
X           (1. - cloud->scale + cloud->scale*It),
X            surf->diff, &surf->diff);
X    ColorScale(1. - surf->transp, surf->amb, &surf->amb);
END_OF_FILE
if test 2607 -ne `wc -c <'libray/libtext/cloud.c'`; then
    echo shar: \"'libray/libtext/cloud.c'\" unpacked with wrong size!
# end of 'libray/libtext/cloud.c'
if test -f 'libray/libtext/stripe.c' -a "${1}" != "-c" ; then
  echo shar: Will not clobber existing file \"'libray/libtext/stripe.c'\"
echo shar: Extracting \"'libray/libtext/stripe.c'\" \(2911 characters\)
sed "s/^X//" >'libray/libtext/stripe.c' <<'END_OF_FILE'
X * stripe.c
X * Copyright (C) 1989, 1991, Craig E. Kolb
X * All rights reserved.
X * This software may be freely copied, modified, and redistributed
X * provided that this copyright notice is preserved on all copies.
X * You may not distribute this software, in whole or in part, as part of
X * any commercial product without the express consent of the authors.
X * There is no warranty or other guarantee of fitness of this software
X * for any purpose.  It is provided solely "as is".
X * $Id: stripe.c,v 4.0 91/07/17 14:43:52 kolb Exp Locker: kolb $
X * $Log:    stripe.c,v $
X * Revision 4.0  91/07/17  14:43:52  kolb
X * Initial version.
X#include "texture.h"
X#include "stripe.h"
XStripe *
XStripeCreate(surf, width, bump, mapping)
XSurface *surf;
XFloat width, bump;
XMapping *mapping;
X    Stripe *stripe;
X    stripe = (Stripe *)Malloc(sizeof(Stripe));
X    stripe->surf = surf;
X    stripe->mapping = mapping;
X    stripe->width = width;
X    stripe->bump = bump;
X    return stripe;
Xvoid
XStripeApply(stripe, prim, ray, pos, norm, gnorm, surf)
XStripe *stripe;
XGeom *prim;
XVector *ray, *pos, *norm, *gnorm;
XSurface *surf;
X    Vector dpdu, dpdv;
X    Float fu, fv, u, v;
X    TextToUV(stripe->mapping, prim, pos, gnorm, &u, &v, &dpdu, &dpdv);
X    u -= floor(u);
X    v -= floor(v);
X     *    s s          s
X     *   | | |        | |
X     * 1 +-+------------+
X     *   |X|\^^^^^^^^^^/| } s
X     *   |X|<+--------+>|
X     *   |X|<|        |>|
X     *   |X|<|        |>|
X     *   |X|<|        |>|
X     * v |X|<|        |>|
X     *   |X|<|        |>|
X     *   |X|<|        |>|
X     *   |X|<+--------+>|
X     *   |X|/vvvvvvvvvv\| } s
X     *   |X+------------+
X     *   |XXXXXXXXXXXXXX| } s
X     * 0 +--------------+
X     *   0              1
X     *        u
X     * where ^ == positive fv, 0 fu, original surf.
X     *     v == negative fv, 0 fu, original surf.
X     *     > == positive fu, 0 fv, original surf.
X     *     < == negative fu, 0 fv, original surf.
X     *   blank == 0 fu, 0 fv, original surf.
X     *       X == 0 fu, 0 fv, alternate surf.
X     * for stripe->bump > 0.  For stripe->bump < 0., change signs.
X     */
X    if (u > 2*stripe->width && v > 2*stripe->width &&
X        u <= 1. - stripe->width && v <= 1. - stripe->width)
X        /* flat surface */
X        return;
X    else if (u < stripe->width || v < stripe->width) {
X        /* on the bottom of the bump. */
X        *surf = *stripe->surf;
X        return;
X     * Lower u & v edges are the 'flat' part of the bump --
X     * make our lives simpler below by 'removing' this area
X     * from u & v.
X     */
X    u = (u - stripe->width) / (1. - stripe->width);
X    v = (v - stripe->width) / (1. - stripe->width);
X     * Now the hard part -- where's the bump?
X     */
X    if (v < u) {
X        if (v < 1. - u) {
X            /* bottom */
X            fu = 0.;
X            fv = -stripe->bump;
X        } else {
X            /* right */
X            fu = stripe->bump;
X            fv = 0.;
X    } else {
X        if (v < 1. - u) {
X            /* left */
X            fu = -stripe->bump;
X            fv = 0.;
X        } else {
X            /* top */
X            fu = 0.;
X            fv = stripe->bump;
X    MakeBump(norm, &dpdu, &dpdv, fu, fv);
END_OF_FILE
if test 2911 -ne `wc -c <'libray/libtext/stripe.c'`; then
    echo shar: \"'libray/libtext/stripe.c'\" unpacked with wrong size!
# end of 'libray/libtext/stripe.c'
if test -f 'libshade/Makefile.SH' -a "${1}" != "-c" ; then
  echo shar: Will not clobber existing file \"'libshade/Makefile.SH'\"
echo shar: Extracting \"'libshade/Makefile.SH'\" \(2825 characters\)
sed "s/^X//" >'libshade/Makefile.SH' <<'END_OF_FILE'
Xcase $CONFIG in
X    if test ! -f config.sh; then
X    ln ../config.sh . || \
X    ln ../../config.sh . || \
X    ln ../../../config.sh . || \
X    (echo "Can't find config.sh."; exit 1)
X    fi
X    . config.sh
X    ;;
Xesac
X: This forces SH files to create target in same directory as SH file.
X: This is so that make depend always knows where to find SH derivatives.
Xcase "$0" in
X*/*) cd `expr X$0 : 'X\(.*\)/'` ;;
Xesac
Xecho "Extracting Makefile (with variable substitutions)"
X: This section of the file will have variable substitutions done on it.
X: Move anything that needs config subs from !NO!SUBS! section to !GROK!THIS!.
X: Protect any dollar signs and backticks that you do not want interpreted
X: by putting a backslash in front.  You may delete these comments.
X$spitshell >Makefile <<!GROK!THIS!
X# Makefile for rayshade.
X# Craig Kolb
X# \$Id: Makefile.SH,v 4.0 91/07/17 14:44:47 kolb Exp Locker: kolb $
X# Bin directory
XBINDIR = $bin
X# If you are using LINDA, add -DLINDA
X# If you are running on a Multimax, add -DMULTIMAX -DSHAREDMEM
X# Be sure to add any necessary floating point hardware switches.
XOPTIMIZE = $optimize
XURTINC = $urtinc
XCCFLAGS = $ccflags $large
XCC = $cc
XMKDEP = $mkdep
XYACC = $yacc
XRANLIB = $ranlib
X!GROK!THIS!
X: In the following dollars and backticks do not need the extra backslash.
X$spitshell >>Makefile <<'!NO!SUBS!'
XLIBRAYDIR = ../libray
XINCLUDE = -I.. -I$(LIBRAYDIR)
XYFLAGS = -d
XCFLAGS = $(CCFLAGS) $(URTINC) $(INCLUDE) $(OPTIMIZE)
XSHELL = /bin/sh
XLIB = libshade.a
XSUPPORT_C =    builtin.c symtab.c misc.c lightdef.c objdef.c options.c \
X        stats.c surfdef.c
XSUPPORT_H =    ../config.h datatypes.h funcdefs.h \
X        ../patchlevel.h rayshade.h
XPARSE_C =    yacc.c lex.c
XDRIVE_C =    setup.c viewing.c shade.c picture.c
XDRIVE_H =    y.tab.h defaults.h viewing.h raytrace.h picture.h
XSUPPORT_O = $(SUPPORT_C:.c=.o)
XPARSE_O = $(PARSE_C:.c=.o)
XDRIVE_O = $(DRIVE_C:.c=.o)
XHFILES = $(DRIVE_H) $(SUPPORT_H)
XCFILES = $(DRIVE_C) $(PARSE_C) $(SUPPORT_C)
XSHFILES = Makefile.SH
XOFILES = $(DRIVE_O) $(PARSE_O) $(SUPPORT_O)
XDEPENDSRC = $(DRIVE_C) lex.l yacc.y $(SUPPORT_C)
X$(LIB): $(OFILES)
X    ar cur $(LIB) $(OFILES)
X    $(RANLIB) $(LIB)
X# Uncomment the following rule if using Linda.
X#raytrace.lo: raytrace.cl
X#    $(LCC) $(CFLAGS) -c raytrace.cl
X# End of configuration section
Xinstall:    rayshade
X        mv rayshade $(BINDIR)/rayshade
Xclean:
X    rm -f $(OFILES) core libshade.a
Xrealclean:
X    rm -f $(OFILES) core libshade.a y.tab.h
X    rm -f *.orig Makefile
Xlint:
X    lint $(CFLAGS) -x $(CFILES) -lm
Xtags:
X    ctags -t $(CFILES)
Xdepend:
X    (sed '/^# DO NOT DELETE THIS LINE/q' Makefile && \
X     $(MKDEP) $(DEPENDSRC) | sed 's/: \.\//: /; /\/usr\/include/d' \
X    ) >Makefile.new
X    cp Makefile Makefile.bak
X    cp Makefile.new Makefile
X    rm -f Makefile.new
X# DO NOT DELETE THIS LINE
X!NO!SUBS!
Xchmod 755 Makefile
X$eunicefix Makefile
END_OF_FILE
if test 2825 -ne `wc -c <'libshade/Makefile.SH'`; then
    echo shar: \"'libshade/Makefile.SH'\" unpacked with wrong size!
chmod +x 'libshade/Makefile.SH'
# end of 'libshade/Makefile.SH'
if test -f 'libshade/surfdef.c' -a "${1}" != "-c" ; then
  echo shar: Will not clobber existing file \"'libshade/surfdef.c'\"
echo shar: Extracting \"'libshade/surfdef.c'\" \(2988 characters\)
sed "s/^X//" >'libshade/surfdef.c' <<'END_OF_FILE'
X * surfdef.c
X * Copyright (C) 1989, 1991, Craig E. Kolb
X * All rights reserved.
X * This software may be freely copied, modified, and redistributed
X * provided that this copyright notice is preserved on all copies.
X * You may not distribute this software, in whole or in part, as part of
X * any commercial product without the express consent of the authors.
X * There is no warranty or other guarantee of fitness of this software
X * for any purpose.  It is provided solely "as is".
X * $Id: surfdef.c,v 4.0 91/07/17 14:47:53 kolb Exp Locker: kolb $
X * $Log:    surfdef.c,v $
X * Revision 4.0  91/07/17  14:47:53  kolb
X * Initial version.
X#include "rayshade.h"
X#include "libsurf/surface.h"
Xstatic Surface *Surfaces;    /* Named surfaces */
XSurface DefaultSurface = {
X        "DeFault",        /* name */
X        {0.1, 0.1, 0.1},    /* ambient */
X        {0.6, 0.6, 0.6},    /* diffuse */
X        {0.5, 0.5, 0.5},    /* specular */
X        {0.0, 0.0, 0.0},    /* Diffuse transmission 'curve' */
X        {1.0, 1.0, 1.0},    /* Specular transmission 'curve' */
X        12.,            /* reflected Phong coef */
X        12.,            /* transmitted Phong coef */
X        1.,            /* spec. transmitted attenuation */
X        DEFAULT_INDEX,        /* index of refr */
X        0.,            /* reflectivity */
X        0.,            /* transparency */
X        0.,            /* translucency */
X        FALSE,            /* noshadow */
X        NULL,            /* next */
XSurface *SurfaceGetNamed(), *SurfaceFetchNamed();
X * Add surf to the list of defined surfaces.
Xvoid
XSurfaceAddToDefined(surf)
XSurface *surf;
X     * Make sure index of refraction isn't bogus.
X     */
X    if (surf->transp > EPSILON && surf->index <= 0.)
X        RLerror(RL_PANIC,
X            "Index of refraction must be positive.\n");
X    if (surf->name == (char *)NULL || *surf->name == (char)NULL)
X        RLerror(RL_PANIC, "Surface with NULL name defined.\n");
X    if (SurfaceFetchNamed(surf->name) != (Surface *)NULL)
X        RLerror(RL_WARN,
X            "Redefinition of \"%s\" surface.", surf->name);
X    surf->next = Surfaces;
X    Surfaces = surf;
X * Search for surface with given name.  If not found, complain and exit.
XSurface *
XSurfaceGetNamed(name)
Xchar *name;
X    Surface *stmp;
X    stmp = SurfaceFetchNamed(name);
X    if (stmp == (Surface *)NULL)
X        RLerror(RL_PANIC, "Undefined surface \"%s\".", name);
X    return stmp;
X * Return pointer to surface with given name, NULL if no such surface.
XSurface *
XSurfaceFetchNamed(name)
Xchar *name;
X    Surface *stmp;
X    for (stmp = Surfaces; stmp ; stmp = stmp->next)
X        if(strcmp(name, stmp->name) == 0)
X            return stmp;
X     * No surface named "name".
X     */
X    return (Surface *)NULL;
X * Traverse the given hitlist to find the "bottom-most" surface.
X * If no surface is found, use the default.
XSurface *
XGetShadingSurf(hitlist)
XHitList *hitlist;
X    int i;
X     * -1 here because the World always has a NULL surface
X     * (DefaultSurf is used instead)
X     */
X    for (i = 0; i < hitlist->nodes -1; i++) {
X        if (hitlist->data[i].obj->surf)
X            return hitlist->data[i].obj->surf;
X     * No suface found -- use the default.
X     */
X    return &DefaultSurface;
END_OF_FILE
if test 2988 -ne `wc -c <'libshade/surfdef.c'`; then
    echo shar: \"'libshade/surfdef.c'\" unpacked with wrong size!
# end of 'libshade/surfdef.c'
if test -f 'raypaint/Makefile.SH' -a "${1}" != "-c" ; then
  echo shar: Will not clobber existing file \"'raypaint/Makefile.SH'\"
echo shar: Extracting \"'raypaint/Makefile.SH'\" \(2800 characters\)
sed "s/^X//" >'raypaint/Makefile.SH' <<'END_OF_FILE'
Xcase $CONFIG in
X    if test ! -f config.sh; then
X    ln ../config.sh . || \
X    ln ../../config.sh . || \
X    ln ../../../config.sh . || \
X    (echo "Can't find config.sh."; exit 1)
X    fi
X    . config.sh
X    ;;
Xesac
X: This forces SH files to create target in same directory as SH file.
X: This is so that make depend always knows where to find SH derivatives.
Xcase "$0" in
X*/*) cd `expr X$0 : 'X\(.*\)/'` ;;
Xesac
Xecho "Extracting Makefile (with variable substitutions)"
X: This section of the file will have variable substitutions done on it.
X: Move anything that needs config subs from !NO!SUBS! section to !GROK!THIS!.
X: Protect any dollar signs and backticks that you do not want interpreted
X: by putting a backslash in front.  You may delete these comments.
X$spitshell >Makefile <<!GROK!THIS!
X# Makefile for raypaint
X# Craig Kolb
X# \$Id: Makefile.SH,v 4.0 91/07/17 14:48:38 kolb Exp Locker: kolb $
X# Bin directory
XBINDIR = $bin
X# If you are using LINDA, add -DLINDA
X# If you are running on a Multimax, add -DMULTIMAX -DSHAREDMEM
X# Be sure to add any necessary floating point hardware switches.
XOPTIMIZE = $optimize
XURTINC = $urtinc
XCCFLAGS = $ccflags $large
XURTLIB = $urtlib
XLDFLAGS = $libs $ldflags
XCC = $cc
XMKDEP = $mkdep
XYACC = $yacc
X!GROK!THIS!
X: In the following dollars and backticks do not need the extra backslash.
X$spitshell >>Makefile <<'!NO!SUBS!'
XLIBRAYDIR = ../libray
XLIBSHADEDIR = ../libshade
XINCLUDE = -I$(LIBRAYDIR) -I$(LIBSHADEDIR) -I..
XYFLAGS = -d
X# If using X11, use:
X#GRAPHICSLIB = -lX11
X# If you are using GL, use:
XGRAPHICSLIB = -lgl_s
XLIBRAY = $(LIBRAYDIR)/libray.a
XLIBSHADE = $(LIBSHADEDIR)/libshade.a
XCFLAGS = $(CCFLAGS) $(URTINC) $(INCLUDE) $(OPTIMIZE) -DSHARED_EDGES
XSHELL = /bin/sh
X# If you are using a Multimax, add -lpp
X# If you have a fast malloc library, use it (e.g., -lmalloc on MIPS machines)
XLIBS = $(LIBSHADE) $(LIBRAY) $(URTLIB)
XDRIVE_C =    main.c graphics.c render.c version.c
XDRIVE_O = $(DRIVE_C:.c=.o)
XCFILES = $(DRIVE_C)
XSHFILES = Makefile.SH
XOBJ = $(DRIVE_O)
XDEPENDSRC = $(DRIVE_C)
Xraypaint: $(OBJ) $(LIBS)
X    $(CC) $(OPTIMIZE) -o raypaint $(OBJ) $(LIBS) $(LDFLAGS) $(GRAPHICSLIB)
X# Uncomment the following rule if using Linda.
X#raytrace.lo: raytrace.cl
X#    $(LCC) $(CFLAGS) -c raytrace.cl
X# End of configuration section
Xinstall:    raypaint
X        mv raypaint $(BINDIR)/raypaint
Xclean:
X    rm -f $(OBJ) core
Xrealclean:
X    rm -f $(OBJ) core y.tab.h
X    rm -f *.orig Makefile
Xlint:
X    lint $(CFLAGS) -x $(CFILES) -lm
Xtags:
X    ctags -t $(CFILES)
Xdepend:
X    (sed '/^# DO NOT DELETE THIS LINE/q' Makefile && \
X     $(MKDEP) $(DEPENDSRC) | sed 's/: \.\//: /; /\/usr\/include/d' \
X    ) >Makefile.new
X    cp Makefile Makefile.bak
X    cp Makefile.new Makefile
X    rm -f Makefile.new
X# DO NOT DELETE THIS LINE
X!NO!SUBS!
Xchmod 755 Makefile
X$eunicefix Makefile
END_OF_FILE
if test 2800 -ne `wc -c <'raypaint/Makefile.SH'`; then
    echo shar: \"'raypaint/Makefile.SH'\" unpacked with wrong size!
chmod +x 'raypaint/Makefile.SH'
# end of 'raypaint/Makefile.SH'
if test -f 'raypaint/glgraphics.c' -a "${1}" != "-c" ; then
  echo shar: Will not clobber existing file \"'raypaint/glgraphics.c'\"
echo shar: Extracting \"'raypaint/glgraphics.c'\" \(2838 characters\)
sed "s/^X//" >'raypaint/glgraphics.c' <<'END_OF_FILE'
X * glgraphics.c
X * Copyright (C) 1989, 1991 Craig E. Kolb
X * All rights reserved.
X * This software may be freely copied, modified, and redistributed
X * provided that this copyright notice is preserved on all copies.
X * You may not distribute this software, in whole or in part, as part of
X * any commercial product without the express consent of the authors.
X * There is no warranty or other guarantee of fitness of this software
X * for any purpose.  It is provided solely "as is".
X * $Id: glgraphics.c,v 4.0 91/07/17 17:36:39 kolb Exp Locker: kolb $
X * $Log:    glgraphics.c,v $
X * Revision 4.0  91/07/17  17:36:39  kolb
X * Initial version.
X#include <gl.h>
X#include <device.h>
X#define CPACK(x)    cpack(((((x)[2] << 8) | (x)[1]) << 8) | x[0])
XGraphicsInit(xsize, ysize, name)
Xint xsize, ysize;
Xchar *name;
X#ifndef _IBMR2
X    foreground();
X#endif
X    prefsize(xsize, ysize);
X    winopen(name);
X    ortho2(-0.5, (float)xsize -0.5, -0.5, (float)ysize - 0.5);
X    viewport(0, xsize -1, 0, ysize -1);
X    color(BLACK);
X    clear();
X    RGBmode();
X    gconfig();
X    unqdevice(INPUTCHANGE);
X    qdevice(LEFTMOUSE);  /* Pop a square on request */
X    qdevice(MIDDLEMOUSE);
X    qdevice(RIGHTMOUSE);
X    qdevice(REDRAW);
X * Draw the pixel at (xp, yp) in the color given by the rgb-triple,
X * 0 indicating 0 intensity, 255 max intensity.
XGraphicsDrawPixel(xp, yp, color)
Xint xp, yp;
Xunsigned char color[3];
X    unsigned long int pix;
X    pix = (((color[2] << 8) | color[1]) << 8) | color[0];
X    lrectwrite(xp, yp, xp, yp, &pix);
X * Draw the rectangle with lower left corner (xp, yp) and upper right
X * corner (xp+ys, yp+ys).  The colors of the l-l, l-r, u-r, and u-l
X * corners are given as arrays of unsigned chars as above.
XGraphicsDrawRectangle(xp, yp, xs, ys, ll, lr, ur, ul)
Xint xp, yp, xs, ys;
Xunsigned char ll[3], lr[3], ur[3], ul[3];
X    int   p[2];
X#if defined(_IBMR2) && !defined(SHARED_EDGES)
X     * RS6000 doesn't seem to draw lower and left edges
X     * of rectangles correctly.
X     */
X    xp--; yp--;
X    xs++; ys++;
X#endif
X    bgnpolygon();
X    p[0] = xp; p[1] = yp;
X    CPACK(ll);
X    v2i(p);
X    p[0] += xs;
X    CPACK(lr);
X    v2i(p);
X    p[1] += ys;
X    CPACK(ur);
X    v2i(p);
X    p[0] = xp;
X    CPACK(ul);
X    v2i(p);
X    endpolygon();
XGraphicsLeftMouseEvent()
X     * Return TRUE if left mouse button is down.
X     */
X    return getbutton(LEFTMOUSE);
XGraphicsMiddleMouseEvent()
X    return getbutton(MIDDLEMOUSE);
XGraphicsRightMouseEvent()
X    return getbutton(RIGHTMOUSE);
X * Return position of mouse in unnormalized screen coordinates.
XGraphicsGetMousePos(x, y)
Xint *x, *y;
X    int xo, yo;
X    getorigin(&xo, &yo);
X    *x = getvaluator( MOUSEX ) - xo;
X    *y = getvaluator( MOUSEY ) - yo;
XGraphicsRedraw()
X    Device dev;
X    short val;
X    while (qtest()) {
X        dev = qread(&val);
X        if (dev == REDRAW) {
X            reshapeviewport();
X            return TRUE;
X    return FALSE;
END_OF_FILE
if test 2838 -ne `wc -c <'raypaint/glgraphics.c'`; then
    echo shar: \"'raypaint/glgraphics.c'\" unpacked with wrong size!
# end of 'raypaint/glgraphics.c'
if test -f 'raypaint/main.c' -a "${1}" != "-c" ; then
  echo shar: Will not clobber existing file \"'raypaint/main.c'\"
echo shar: Extracting \"'raypaint/main.c'\" \(2648 characters\)
sed "s/^X//" >'raypaint/main.c' <<'END_OF_FILE'
X * main.c
X * Copyright (C) 1989, 1991, Craig E. Kolb
X * All rights reserved.
X * This software may be freely copied, modified, and redistributed
X * provided that this copyright notice is preserved on all copies.
X * You may not distribute this software, in whole or in part, as part of
X * any commercial product without the express consent of the authors.
X * There is no warranty or other guarantee of fitness of this software
X * for any purpose.  It is provided solely "as is".
X * $Id: main.c,v 4.0 91/07/17 17:36:46 kolb Exp Locker: kolb $
X * $Log:    main.c,v $
X * Revision 4.0  91/07/17  17:36:46  kolb
X * Initial version.
Xchar rcsid[] = "$Id: main.c,v 4.0 91/07/17 17:36:46 kolb Exp Locker: kolb $";
X#include "rayshade.h"
X#include "options.h"
X#include "stats.h"
X#include "viewing.h"
X#include "picture.h"
Xvoid RSInitialize(), RSStartFrame();
Xmain(argc, argv)
Xint argc;
Xchar **argv;
X    Float utime, stime;
X      * Initialize variables, etc.
X     */
X    RSInitialize(argc, argv);
X    RSStartFrame(Options.startframe);
X      * Print more information than we'll ever need to know...
X     */
X    if (Options.verbose) {
X        extern Geom *World;
X        /* World object info. */
X        AggregatePrintInfo(World, Stats.fstats);
X        /* Print info about rendering options and the like. */
X        RSOptionsList();
X     * Print preprocessing time.
X     */
X    RSGetCpuTime(&utime, &stime);
X    fprintf(Stats.fstats,"Preprocessing time:\t");
X    fprintf(Stats.fstats,"%2.2fu  %2.2fs\n", utime, stime);
X    fprintf(Stats.fstats,"Starting trace.\n");
X    (void)fflush(Stats.fstats);
X     * Render the image.
X     */
X    Render(argc, argv);
X    StatsPrint();
X    return 0;
Xstatic void
XRSStartFrame(frame)
Xint frame;
X     * Set the frame start time
X     */
X    Options.framenum = frame;
X    Options.framestart = Options.starttime +
X            Options.framenum*Options.framelength;
X    SamplingSetTime(Options.framestart, Options.shutterspeed,
X            Options.framenum);
X     * Set up viewing parameters.
X     */
X    RSViewing();
X     * Initialize world
X     */
X    WorldSetup();
X * Initialize non-time-varying goodies.
Xstatic void
XRSInitialize(argc, argv)
Xint argc;
Xchar **argv;
X      * Initialize variables, etc.
X     */
X    RSSetup();
X     * Parse options from command line.
X     */
X    RSOptionsSet(argc, argv);
X     * Process input file.
X     */
X    if (Options.verbose) {
X        VersionPrint();
X        fprintf(Stats.fstats,"Reading input file...\n");
X        (void)fflush(Stats.fstats);
X    RSReadInputFile();
X     * Set variables that weren't set on command line
X     * or in input file.
X     */
X    RSCleanup();
X     * Set sampling options.
X     */
X    SamplingSetOptions(Options.samples, Options.gaussian,
X               Options.filterwidth);
END_OF_FILE
if test 2648 -ne `wc -c <'raypaint/main.c'`; then
    echo shar: \"'raypaint/main.c'\" unpacked with wrong size!
# end of 'raypaint/main.c'
if test -f 'rayshade/Makefile.SH' -a "${1}" != "-c" ; then
  echo shar: Will not clobber existing file \"'rayshade/Makefile.SH'\"
echo shar: Extracting \"'rayshade/Makefile.SH'\" \(2719 characters\)
sed "s/^X//" >'rayshade/Makefile.SH' <<'END_OF_FILE'
Xcase $CONFIG in
X    if test ! -f config.sh; then
X    ln ../config.sh . || \
X    ln ../../config.sh . || \
X    ln ../../../config.sh . || \
X    (echo "Can't find config.sh."; exit 1)
X    fi
X    . config.sh
X    ;;
Xesac
X: This forces SH files to create target in same directory as SH file.
X: This is so that make depend always knows where to find SH derivatives.
Xcase "$0" in
X*/*) cd `expr X$0 : 'X\(.*\)/'` ;;
Xesac
Xecho "Extracting Makefile (with variable substitutions)"
X: This section of the file will have variable substitutions done on it.
X: Move anything that needs config subs from !NO!SUBS! section to !GROK!THIS!.
X: Protect any dollar signs and backticks that you do not want interpreted
X: by putting a backslash in front.  You may delete these comments.
X$spitshell >Makefile <<!GROK!THIS!
X# Makefile for rayshade.
X# Craig Kolb
X# \$Id: Makefile.SH,v 4.0 91/07/17 14:50:30 kolb Exp Locker: kolb $
X# Bin directory
XBINDIR = $bin
XOPTIMIZE = $optimize
XURTINC = $urtinc
XCCFLAGS = $ccflags $large
XURTLIB = $urtlib
XLDFLAGS = $libs $ldflags
XCC = $cc
XMKDEP = $mkdep
XYACC = $yacc
XCLC = $lindacc
X!GROK!THIS!
X: In the following dollars and backticks do not need the extra backslash.
X$spitshell >>Makefile <<'!NO!SUBS!'
XLIBRAYDIR = ../libray
XLIBSHADEDIR = ../libshade
XINCLUDE = -I$(LIBRAYDIR) -I$(LIBSHADEDIR) -I.. $(URTINC)
XYFLAGS = -d
XLIBRAY = $(LIBRAYDIR)/libray.a
XLIBSHADE = $(LIBSHADEDIR)/libshade.a
X# If you are using LINDA, add -DLINDA
X# If you are running 'tsnet'-style LINDA, add -DTSNET
X# If you are running on a Multimax, add -DMULTIMAX -DSHAREDMEM
XCFLAGS = $(CCFLAGS) $(INCLUDE) $(OPTIMIZE)
X# C-Linda flags, if appropriate
X#CLFLAGS = -linda ts 20000
XSHELL = /bin/sh
XLIBS = $(LIBSHADE) $(LIBRAY) $(URTLIB)
XDRIVE_C =    main.c raytrace.c version.c
XDRIVE_H =    raytrace.h
XDRIVE_O = $(DRIVE_C:.c=.o)
XHFILES = $(DRIVE_H)
XCFILES = $(DRIVE_C)
XSHFILES = Makefile.SH
XOBJ = $(DRIVE_O)
XDEPENDSRC = $(DRIVE_C)
X# Change $(CC) below to $(CLC) if using Linda.
Xrayshade: $(OBJ) $(LIBS)
X    $(CC) $(OPTIMIZE) -o rayshade $(OBJ) $(LIBS) $(LDFLAGS)
X# Uncomment the following rule if using Linda.
X#raytrace.lo: raytrace.cl
X#    $(CLC) $(INCLUDE) $(LCFLAGS) -c raytrace.cl
X# End of configuration section
Xinstall:    rayshade
X        mv rayshade $(BINDIR)/rayshade
Xclean:
X    rm -f $(OBJ) core
Xrealclean:
X    rm -f $(OBJ) core y.tab.h
X    rm -f *.orig Makefile
Xlint:
X    lint $(CFLAGS) -x $(CFILES) -lm
Xtags:
X    ctags -t $(CFILES)
Xdepend:
X    (sed '/^# DO NOT DELETE THIS LINE/q' Makefile && \
X     $(MKDEP) $(DEPENDSRC) | sed 's/: \.\//: /; /\/usr\/include/d' \
X    ) >Makefile.new
X    cp Makefile Makefile.bak
X    cp Makefile.new Makefile
X    rm -f Makefile.new
X# DO NOT DELETE THIS LINE
X!NO!SUBS!
Xchmod 755 Makefile
X$eunicefix Makefile
END_OF_FILE
if test 2719 -ne `wc -c <'rayshade/Makefile.SH'`; then
    echo shar: \"'rayshade/Makefile.SH'\" unpacked with wrong size!
chmod +x 'rayshade/Makefile.SH'
# end of 'rayshade/Makefile.SH'
if test -f 'rayview/Makefile.SH' -a "${1}" != "-c" ; then
  echo shar: Will not clobber existing file \"'rayview/Makefile.SH'\"
echo shar: Extracting \"'rayview/Makefile.SH'\" \(2878 characters\)
sed "s/^X//" >'rayview/Makefile.SH' <<'END_OF_FILE'
Xcase $CONFIG in
X    if test ! -f config.sh; then
X    ln ../config.sh . || \
X    ln ../../config.sh . || \
X    ln ../../../config.sh . || \
X    (echo "Can't find config.sh."; exit 1)
X    fi
X    . config.sh
X    ;;
Xesac
X: This forces SH files to create target in same directory as SH file.
X: This is so that make depend always knows where to find SH derivatives.
Xcase "$0" in
X*/*) cd `expr X$0 : 'X\(.*\)/'` ;;
Xesac
Xecho "Extracting Makefile (with variable substitutions)"
X: This section of the file will have variable substitutions done on it.
X: Move anything that needs config subs from !NO!SUBS! section to !GROK!THIS!.
X: Protect any dollar signs and backticks that you do not want interpreted
X: by putting a backslash in front.  You may delete these comments.
X$spitshell >Makefile <<!GROK!THIS!
X# Makefile for rayview
X# Craig Kolb
X# \$Id: Makefile.SH,v 4.0 91/07/17 14:55:03 kolb Exp Locker: kolb $
X# Bin directory
XBINDIR = $bin
X# If you are using LINDA, add -DLINDA
X# If you are running on a Multimax, add -DMULTIMAX -DSHAREDMEM
X# Be sure to add any necessary floating point hardware switches.
XOPTIMIZE = $optimize
XURTINC = $urtinc
XCCFLAGS = $ccflags $large
XURTLIB = $urtlib
XLDFLAGS = $libs $ldflags
XCC = $cc
XMKDEP = $mkdep
XYACC = $yacc
X!GROK!THIS!
X: In the following dollars and backticks do not need the extra backslash.
X$spitshell >>Makefile <<'!NO!SUBS!'
XLIBRAYDIR = ../libray
XLIBSHADEDIR = ../libshade
XINCLUDE = -I$(LIBRAYDIR) -I$(LIBSHADEDIR) -I..
XYFLAGS = -d
X# If using GL on an SGI machine, use:
XGRAPHICSLIBS = -lsphere -lgl_s
XSPHERELIB = -DSPHERELIB
X# If using GL on an RS6000, use:
X#GRAPHICSLIBS = -lgl
X#SPHERELIB=
XLIBRAY = $(LIBRAYDIR)/libray.a
XLIBSHADE = $(LIBSHADEDIR)/libshade.a
XCFLAGS = $(CCFLAGS) $(SPHERELIB) $(URTINC) $(INCLUDE) $(OPTIMIZE)
XSHELL = /bin/sh
X# If you have a fast malloc library, use it (e.g., -lmalloc on MIPS machines)
XLIBS = $(LIBSHADE) $(LIBRAY) $(URTLIB)
XDRIVE_C =    main.c glmethods.c spheregen.c version.c
XDRIVE_O = $(DRIVE_C:.c=.o)
XCFILES = $(DRIVE_C)
XSHFILES = Makefile.SH
XOBJ = $(DRIVE_O)
XDEPENDSRC = $(DRIVE_C)
X# Change $(CC) below to $(LCC) if using Linda.
Xrayview: $(OBJ) $(LIBS)
X    $(CC) $(OPTIMIZE) -o rayview $(OBJ) $(GRAPHICSLIBS) $(LIBS) $(LDFLAGS)
X# Uncomment the following rule if using Linda.
X#raytrace.lo: raytrace.cl
X#    $(LCC) $(CFLAGS) -c raytrace.cl
X# End of configuration section
Xinstall:    rayview
X        mv rayview $(BINDIR)/rayview
Xclean:
X    rm -f $(OBJ) core
Xrealclean:
X    rm -f $(OBJ) core y.tab.h
X    rm -f *.orig Makefile
Xlint:
X    lint $(CFLAGS) -x $(CFILES) -lm
Xtags:
X    ctags -t $(CFILES)
Xdepend:
X    (sed '/^# DO NOT DELETE THIS LINE/q' Makefile && \
X     $(MKDEP) $(DEPENDSRC) | sed 's/: \.\//: /; /\/usr\/include/d' \
X    ) >Makefile.new
X    cp Makefile Makefile.bak
X    cp Makefile.new Makefile
X    rm -f Makefile.new
X# DO NOT DELETE THIS LINE
X!NO!SUBS!
Xchmod 755 Makefile
X$eunicefix Makefile
END_OF_FILE
if test 2878 -ne `wc -c <'rayview/Makefile.SH'`; then
    echo shar: \"'rayview/Makefile.SH'\" unpacked with wrong size!
chmod +x 'rayview/Makefile.SH'
# end of 'rayview/Makefile.SH'
echo shar: End of archive 6 \(of 19\).
cp /dev/null ark6isdone
MISSING=""
for I in 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 ; do
    if test ! -f ark${I}isdone ; then
    MISSING="${MISSING} ${I}"
    fi
if test "${MISSING}" = "" ; then
    echo You have unpacked all 19 archives.
    rm -f ark[1-9]isdone ark[1-9][0-9]isdone
    echo You still need to unpack the following archives:
    echo "        " ${MISSING}
##  End of shell archive.
exit 0
exit 0 # Just in case...