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Switch to a more industry-standard shadow map splitting scheme

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This commit is contained in:
AnyOldName3 2017-12-17 00:52:10 +00:00
parent 78eb18e55f
commit 8957c92a36
1 changed files with 41 additions and 1 deletions
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42
components/sceneutil/shadow.cpp
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@ -604,7 +604,7 @@ namespace SceneUtil
// hardwired for 2 splits
double r_start = (sm_i == 0) ? -1.0 : splitPoint;
double r_end = (sm_i + 1 == numShadowMapsPerLight) ? 1.0 : splitPoint;
#else
#elif 0
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)
@ -613,6 +613,7 @@ namespace SceneUtil
{
r_start = (1 - pow(4.0, sm_i)) / (1 - pow(4.0, numShadowMapsPerLight));
r_start *= 2.0;
//r_start += double(sm_i) / double(numShadowMapsPerLight);
r_start -= 1.0;
}
@ -622,8 +623,47 @@ namespace SceneUtil
{
r_end = (1 - pow(4.0, sm_i + 1)) / (1 - pow(4.0, numShadowMapsPerLight));
r_end *= 2.0;
//r_end += double(sm_i + 1) / double(numShadowMapsPerLight);
r_end -= 1.0;
}
#else
double r_start, r_end;
// split system based on the original Parallel Split Shadow Maps paper.
double n = (frustum.eye - frustum.centerNearPlane).length();
double f = (frustum.eye - frustum.centerFarPlane).length();
double i = double(sm_i);
double m = double(numShadowMapsPerLight);
double deltaBias = 0;
if (sm_i == 0)
r_start = -1.0;
else
{
// compute the split point in main camera view
double ciLog = n * pow(f / n, i / m);
double ciUniform = n + (f - n) * i / m;
double ci = (ciLog + ciUniform) / 2 + deltaBias;
// work out where this is in light space
osg::Vec3d worldSpacePos = frustum.eye + frustum.frustumCenterLine * ci;
osg::Vec3d lightSpacePos = worldSpacePos * viewMatrix * projectionMatrix;
r_start = lightSpacePos.y();
}
if (sm_i + 1 == numShadowMapsPerLight)
r_end = 1.0;
else
{
// compute the split point in main camera view
double ciLog = n * pow(f / n, (i + 1) / m);
double ciUniform = n + (f - n) * (i + 1) / m;
double ci = (ciLog + ciUniform) / 2 + deltaBias;
// work out where this is in light space
osg::Vec3d worldSpacePos = frustum.eye + frustum.frustumCenterLine * ci;
osg::Vec3d lightSpacePos = worldSpacePos * viewMatrix * projectionMatrix;
r_end = lightSpacePos.y();
}
#endif
// for all by the last shadowmap shift the r_end so that it overlaps slightly with the next shadowmap