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object3d.txt
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1997-07-08
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THREE DIMENSIONAL GEOMETRY DEMO
This demo shows geometric forms and molecules.
Choose among several different 3D objects.
MENU OPTIONS
------------
File Menu:
Select "Quit" to exit the Map Demo and return
to the IDL Demo main screen.
Options Menu:
Shading
o Select "Flat" to represent solid objects.
o Select "Gouraud" shading for the solid.
Gouraud shading results in a more realistic
appearance.
Shading is only enabled when the Style is set
to Solid.
Style
o Select "Points" to display the object as a set
of points.
o Select "Wire" to display the object with a
wire-frame surface.
o Select "Solid" to display the object as a
solid. You can also select either "Flat" or
"Gouraud" shading.
o Select "Hidden Points" to display only the
points located immediately in front.
o Select "Hidden Wire" to display only the lines
of the wire-surface located immediately in
front.
Backface culling
Select this option (turn it "on") to only
show the outside surface of the objects,
making inner surfaces transparent.
Vertex coloring
Select this option (turn it "on") to display
the object with predetermined colors.
Edging
Select this option (turn it "on") to show the
polygon edges of the object. This option is
the most effective when viewed with the
"Solid" style.
Bottom color
Select this option (turn it "on") to
differentiate inner surfaces with a separate
color.
Line thickness
Select the line thickness (1, 3, 5 or 7
points). This option is disabled when the
style is set to "Solid".
Drag quality
Drag quality applies only to solid surfaces.
o Select "Low" to show the dragged image as
a single-color wire-frame object.
o Select "Medium" to show the dragged image
as a "Flat" object, even if the Shading is
already set to "Flat".
o Select "High" to show the dragged image as
it is shown.
The higher the drag quality, the slower the
speed of rendering the object. You may or may
not see a difference, depending on your
machine's speed.
About Menu:
Select "About 3D Geometry" for information about
the 3D Geometry Demo.
FEATURES
--------
<<Seashell>> radio button
Shows a seashell-shaped object.
<<Knot>> radio button
Shows a pretzel-like knot object.
<<Teapot>> radio button
Shows a teapot-shaped object.
<<Valium Molecule>> radio button
Shows a valium molecule.
<<Aspartame>> radio button
Shows an aspartame molecule.
<<Caffeine>> radio button
Shows a caffeine molecule.
<<Reset Orientation>> button
Return the object to its initial orientation.
INTERACTIVE MOVEMENT
Use your left mouse button to interactively
rotate (drag) the selected object. Position the
cursor on the object and, while holding down the
left mouse button, move the cursor. Release the
mouse button when you are satisfied with the
position of the object.
For solid objects, you can also specify the Drag
Quality, which affects the object's appearance
while it is being dragged. If you find that
dragging the object is slow, lower the
Drag Quality.