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Gaussian dither

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Steven Robertson 2011-06-13 23:20:39 -04:00
parent 18ca9cf2f9
commit 702e303509
1 changed files with 9 additions and 3 deletions
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12
cuburn/code/iter.py
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@ -112,10 +112,16 @@ void iter(mwc_st *msts, iter_info *infos, float4 *accbuf, float *denbuf) {
'cp.camera_transform', 'cam')}}
{{endif}}
float ditherwidth = {{packer.get('0.5 * cp.spatial_filter_radius')}};
float ditherx = mwc_next_11(&rctx) * ditherwidth;
float dithery = mwc_next_11(&rctx) * ditherwidth;
// TODO: verify that constants get premultiplied
float ditherwidth = {{packer.get('0.33 * cp.spatial_filter_radius')}};
float u0 = mwc_next_01(&rctx);
float r = ditherwidth * sqrt(-2.0f * log2f(u0) / M_LOG2E);
// TODO: provide mwc_next_0_2pi()
float u1 = 2.0f * M_PI * mwc_next_01(&rctx);
float ditherx = r * cos(u1);
float dithery = r * sin(u1);
int ix = trunca(cx+ditherx), iy = trunca(cy+dithery);
if (ix < 0 || ix >= {{features.acc_width}} ||