out colour = 0
out alpha = 0
blend alpha = 0
loop n times
{
s = sample volume texture at p
BEGIN LIGHTING
light density = 0
loop m times
{
t = sample volume texture at q
light density += t.a
}
s.rgb *= (1 - light density) * light colour
END LIGHTING
out colour += s.rgb * (1 - blend alpha)
blend alpha += s.a
out alpha += s.a * (1 - out alpha)
}
final pixel value = (out colour, out alpha)
volume lighting
Author
i have a volumetric box im trying to add lighting to. Everything i try results in something going wrong.
so im gonna explain what i think should be happening:
im ray casting through my box, from back to front, doing n samples (lets call these b and f).
for each sample i know its position inside the box, will call this p.
I then ray cast from where p intersects the box towards the light (lets call this point l), doing m samples. Again for each sample between l and p i knows its position inside the box, will call this q
so i do:
final pixel gets blended to the screen using standard alpha blending.
so im calulating lighting at the point p based on how much light should be able to get to that point by adding all density samples from l to p
the light colour is multiplied with colour of the volume at point p
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