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feat(draw): compensate for the under-shadowing caused by sampling AO terms away from surfaces

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yvt 2021-02-09 02:45:13 +09:00
parent 2f721d26c8
commit 62930e4d9e
1 changed files with 12 additions and 0 deletions
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12
Sources/Draw/GLAmbientShadowRenderer.cpp
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@ -365,6 +365,18 @@ namespace spades {
}
}
// The AO terms are sampled 0.5 blocks away from the terrain surface, which leads to
// under-shadowing. De-noising by blurring also exacerbates this. So we compensate for
// this effect.
//
// This has a nice side-effect of producing shallow gradients on flat surfaces.
for (int z = c.dirtyMinZ; z <= c.dirtyMaxZ; z++)
for (int y = c.dirtyMinY; y <= c.dirtyMaxY; y++)
for (int x = c.dirtyMinX; x <= c.dirtyMaxX; x++) {
float &d = c.data[z][y][x][0];
d *= d * d * d + 1.0f - d;
}
// Blur the result to remove noise
for (int blurPass = 0; blurPass < 1; ++blurPass) {
for (int z = c.dirtyMinZ; z <= c.dirtyMaxZ; z++)