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Implement a more sensible shadow map cascading system

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AnyOldName3 2017-12-12 22:37:40 +00:00
parent 617473c7da
commit 7cce2d6f87
1 changed files with 22 additions and 2 deletions
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24
components/sceneutil/shadow.cpp
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@ -596,14 +596,34 @@ namespace SceneUtil
if (numShadowMapsPerLight>1)
{
// compute the start and end range in non-dimensional coords
#if 1
#if 0
double r_start = (sm_i == 0) ? -1.0 : (double(sm_i) / double(numShadowMapsPerLight)*2.0 - 1.0);
double r_end = (sm_i + 1 == numShadowMapsPerLight) ? 1.0 : (double(sm_i + 1) / double(numShadowMapsPerLight)*2.0 - 1.0);
#else
#elif 0
// hardwired for 2 splits
double r_start = (sm_i == 0) ? -1.0 : splitPoint;
double r_end = (sm_i + 1 == numShadowMapsPerLight) ? 1.0 : splitPoint;
#else
double r_start, r_end;
// Split such that each shadow map covers a quarter of the area of the one after it
if (sm_i == 0)
r_start = -1.0;
else
{
r_start = (1 - pow(4.0, sm_i)) / (1 - pow(4.0, numShadowMapsPerLight));
r_start *= 2.0;
r_start -= 1.0;
}
if (sm_i + 1 == numShadowMapsPerLight)
r_end = 1.0;
else
{
r_end = (1 - pow(4.0, sm_i + 1)) / (1 - pow(4.0, numShadowMapsPerLight));
r_end *= 2.0;
r_end -= 1.0;
}
#endif
// for all by the last shadowmap shift the r_end so that it overlaps slightly with the next shadowmap