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use a Gaussian-like random distribution for random subsampling

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This commit is contained in:
Rudolf Polzer
2010-10-03 21:14:54 +02:00
parent 02d17b50a7
commit 4c13f31535
1 changed files with 22 additions and 2 deletions
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24
tools/quake3/q3map2/light_ydnar.c
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@@ -1889,12 +1889,27 @@ static void SubsampleRawLuxel_r( rawLightmap_t *lm, trace_t *trace, vec3_t sampl
}
}
}
/* A mostly Gaussian-like bounded random distribution (sigma is expected standard deviation) */
static void GaussLikeRandom(float sigma, float *x, float *y)
{
float r;
r = Random() * 2 * Q_PI;
*x = sigma * 2.73861278752581783822 * cos(r);
*y = sigma * 2.73861278752581783822 * sin(r);
r = Random();
r = 1 - sqrt(r);
r = 1 - sqrt(r);
*x *= r;
*y *= r;
}
static void RandomSubsampleRawLuxel( rawLightmap_t *lm, trace_t *trace, vec3_t sampleOrigin, int x, int y, float bias, float *lightLuxel, float *lightDeluxel )
{
int b, mapped;
int cluster;
vec3_t origin, normal;
vec3_t total, totaldirection;
float dx, dy;
VectorClear( total );
mapped = 0;
@@ -1902,9 +1917,14 @@ static void RandomSubsampleRawLuxel( rawLightmap_t *lm, trace_t *trace, vec3_t s
{
/* set origin */
VectorCopy( sampleOrigin, origin );
GaussLikeRandom(bias, &dx, &dy);
if(dx > 1) dx = 1;
if(dy > 1) dy = 1;
if(dx < -1) dx = -1;
if(dy < -1) dy = -1;
/* calculate position */
if( !SubmapRawLuxel( lm, x, y, (bias * (2 * Random() - 1)), (bias * (2 * Random() - 1)), &cluster, origin, normal ) )
if( !SubmapRawLuxel( lm, x, y, dx, dy, &cluster, origin, normal ) )
{
cluster = -1;
continue;