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Unified renderer OSA sample clipping:

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User info:
	This change limits the contribution of any OSA sample to 1.0 per color
	in the Unified renderer.  Because color=1.0 gives fully saturated color,
	samples contributing more than 1.0 were overweighted in the OSA average
	causing aliasing (sometimes quite severe).

	Samples can contribute more than 1.0 because a material's spec and refl
	values are not normalized (In real world spec+refl <= 1.0).  This solves
	a large class of aliasing problems in the unified renderer.

Coder Info:
	None.
This commit is contained in:
Robert Wenzlaff
2003-10-19 21:08:44 +00:00
parent d5322a6352
commit 7ac2731e63
1 changed files with 7 additions and 5 deletions
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12
source/blender/render/intern/source/pixelblending.c
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@@ -618,9 +618,9 @@ void sampleFloatColV2FloatColV(float *sample, float *dest, int osaNr)
if (doGamma()) {
/* use a LUT and interpolation to do the gamma correction */
for(a=0; a < osaNr; a++, scol+=4) {
intcol[0] += gammaCorrect(scol[0]);
intcol[1] += gammaCorrect(scol[1]);
intcol[2] += gammaCorrect(scol[2]);
intcol[0] += gammaCorrect( (scol[0]<1.0) ? scol[0]:1.0 );
intcol[1] += gammaCorrect( (scol[1]<1.0) ? scol[1]:1.0 );
intcol[2] += gammaCorrect( (scol[2]<1.0) ? scol[2]:1.0 );
intcol[3] += scol[3];
}
@@ -638,8 +638,10 @@ void sampleFloatColV2FloatColV(float *sample, float *dest, int osaNr)
} else {
/* no gamma */
for(a=0; a < osaNr; a++, scol+=4) {
intcol[0] += scol[0]; intcol[1] += scol[1];
intcol[2] += scol[2]; intcol[3] += scol[3];
intcol[0] += (scol[0]<1.0) ? scol[0]:1.0 ;
intcol[1] += (scol[1]<1.0) ? scol[1]:1.0 ;
intcol[2] += (scol[2]<1.0) ? scol[2]:1.0 ;
intcol[3] += scol[3];
}
dest[0]= intcol[0]/osaNr;