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Fix #36884: blender spotlamp halo render was incorrectly showing light on the 

backside of objects, after bugfix in revision 56145.

It now still always renders one step, but step size is clamped to fit within
the halo volume.
This commit is contained in:
Brecht Van Lommel 2013-09-30 15:27:45 +00:00
parent 414fadb192
commit 06c6d3235c
1 changed files with 10 additions and 5 deletions
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15
source/blender/render/intern/source/shadbuf.c
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@ -1373,7 +1373,7 @@ float shadow_halo(LampRen *lar, const float p1[3], const float p2[3])
/* printf("start %x %x \n", (int)(0x7FFFFFFF*zf1), (int)(0x7FFFFFFF*zf2)); */
while (1) {
do {
lambda_o= lambda;
if (lambda_x==lambda_y) {
@ -1394,7 +1394,13 @@ float shadow_halo(LampRen *lar, const float p1[3], const float p2[3])
}
lambda = min_ff(lambda_x, lambda_y);
/* not making any progress? */
if (lambda==lambda_o) break;
/* clip to end of volume */
lambda = min_ff(lambda, 1.0f);
zf= zf1 + lambda*(zf2-zf1);
count+= (float)shb->totbuf;
@ -1409,10 +1415,9 @@ float shadow_halo(LampRen *lar, const float p1[3], const float p2[3])
lightcount+= readshadowbuf_halo(shb, shsample, x, y, z);
}
/* break after sample, so it takes at least one */
if (lambda==lambda_o || lambda>=1.0f) break;
}
while (lambda < 1.0f);
if (count!=0.0f) return (lightcount/count);
return 0.0f;