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globalfx.txt
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1994-05-04
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Global Lens Flare
Synopsis:
This FX emmulates the artifacting that occurs when a bright light reflects
around inside of a real-world camera lens. This artifacting is affected by
imperfections in the lenses, the shape of the camera's iris, and by the
different coatings on the lenses.
Requester:
Halo Around Light Sources : This flag lets the effect put a fuzzy
halo around the light in the image. The
size of the halo is set by the light's Z
axis size. This emulates the
imperfections or dirt/fog on the first
lens of the camera.
Number of Round Lenses : This sets the number of round shaped
flares that will be created by each light
(although, all the flares may not be
visable because they are being cast
outside of the film plane). This flare is
what would be caused by a camera with a
perfect iris. There are some cameras that
have enough parts in them that they
approach a nearly circular iris.
Number of Octagonal Lenses : This sets the number of octagon shaped
flares that will be created by each light
(although, all the flares may not be
visable because they are being cast
outside of the film plane). Octagon
shaped flares are created by cameras with
octagonal iris'.
Min/Max Flare Intensity (0..1) : These parameters set the the range of
intensities for the flares. An intensity
of 1.0 means that the imagine will be
totally occluded by the flare.
Min/Max Flare Size (0..1) : These parameters set the range of sizes
for the flares. The numbers represent the
flare size as a fraction of the image
width.
Flare Spacing Adjustment : This parameter adjusts how close to the
center of the image the flares will be
packed (sort of a position control).
Fraction w/o Edges (0..1) : In a real camera, the complex of lenses
often consists of both concave and convex
lenses. The idea is that convex lenses
create flares with "hotter" (more intense)
centers, and that concave lenses have
hotter edges (I may have these turned
around, but the idea is the same). Flares
w/o Edges are flare with hot centers and
flares with edges are flares with hot
edges. The intensities themselves come
from the ranges allowed by the Min/Max
Flare Intensity parameters.
Random Number Seed : This seed value allows you to effectively
change lenses without having to change all
the other parameters you've set up.
Restrict to far/near side of center : These flags are used to say, "I only
want lens flares to show up between the
lightsource and the center of the
screen." Some lenses appear to do this,
so these flags let you control it.
Things to keep in mind to get the most out of this FX:
Lights that are behind the camera will not flare. Lights will flare when
they are beyond the field of view of the camera, but once they are behind
the camera, there is no way they could cast light directly into a lens and
therefore, stop flaring.
A real camera has an iris with only one shape to it. The flares take on the
shape of the iris, so using both round and octagonal flare together may look
"fakey" to a purist. If you're shooting for photo realism with lens flare,
stick to just round or just octagonal lenses.
The lens flares that occur in real cameras tend to be much smaller the the
default values in this FX. These defaults in this FX are set up so that the
flares can be easily spotted while testing. Some lenses do give very large
flares, but you may want to make the effect a bit subtler by making them
smaller and less intense.
The size, position, and color of the lens flares is only is only barely
controllable by the user. You are able to set limits on the size and
intensities of the flares, you are able to control how tightly packed the
flares are and where they are with reference to the center of the image, and
you can approximately control the colors of the flares by using colored light
sources. All the specifics about what each individual flare looks like is
determined randomly within the FX, and the only control you've got is by
changing the random number. When a photographer purposly wants to use flare
for dramatic effect, the only control he/she has over the look of the flares
is done with filters and by changing whole lenses. By changing the random
number, you are effectively changing to a new lens that may have the
coatings and lens types you need to get just the right effect.
==================================
Global Haze
Synopsis:
This FX will key off of a specific color in an image and blend that color
outward from wherever is is found. The idea is that bright objects can be
given an apparent glow or halo by telling the FX to look for the color of
the bright object. The Start and End values in this FX allow it to animate,
so you can make something flare up during an animation. The speed of this
FX is very dependant upon image size and upon the radii set in the
requester. It will slow way down if you choose to have large radii on a big
image.
Requester:
Start/End Haze Radius : This sets how far the halo emminates
from the edges of the key color it picks
up. The radius is measured in pixels,
but more specifically, it is actually
measured in pixel widths (this may be
important to those using output devices
with eccentric aspect ratios). The
Start/End values let you animate the
radius size during the progress of the
animation.
Start/End Haze Intensity : This sets the maximum intensity that the
halo will have in pixels adjacent to the
key colored pixels. The Start/End
values let you animate the intensity
during the progress of the animation.
Haze Key Color Red/Green/Blue : These are the Red, Green, and Blue color
gun values that the effect will look for
and haze outwards from.
Things to keep in mind to get the most out of this FX:
The radii of the haze in this effect is measured in pixels - not image size.
It is not resolution independant, and will not look the same on two
different size images unless you change the radius of the FX in the new
image. If you get an effect you like, and do another picture that is twice
as wide (in pixels), you have to make the Start/End radii twice as big as
you did to get the same effect you did in your first image.
The effect keys specifically off of the color in the Red/Green/Blue
parameters. On the edges of objects, pixels are antialiased and the FX may
not exactly pick up the outer edge of the bright object you're lookin for.
This is more noticable in lower resolution images and if objects get very
small.