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Even better cell edge shadow clip handling

This commit is contained in:
Jarrod Doyle 2024-10-28 08:06:24 +00:00
parent 175be69b6d
commit 19882dcff2
Signed by: Jayrude
GPG Key ID: 38B57B16E7C0ADF7
1 changed files with 26 additions and 0 deletions
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26
KeepersCompound.Lightmapper/Program.cs
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@ -450,6 +450,32 @@ class Program
pos += x * 0.25f * renderPoly.TextureVectors.Item1;
pos += y * 0.25f * renderPoly.TextureVectors.Item2;
// Embree has robustness issues when hitting poly edges which
// results in false misses. To alleviate this we pre-push everything
// slightly towards the center of the poly.
var centerOffset = renderPoly.Center - pos;
if (centerOffset.LengthSquared() > MathUtils.Epsilon)
{
pos += Vector3.Normalize(centerOffset) * MathUtils.Epsilon;
}
// If we can't see our target point from the center of the poly
// then it's outside the world. We need to clip the point to slightly
// inside the poly and retrace to avoid three problems:
// 1. Darkened spots from lightmap pixels whose center is outside
// the polygon but is partially contained in the polygon
// 2. Darkened spots from linear filtering of points outside the
// polygon which have missed
// 3. Darkened spots where centers are on the exact edge of a poly
// which can sometimes cause Embree to miss casts
var inPoly = TraceRay(scene, pos, renderPoly.Center + plane.Normal * 0.25f);
if (!inPoly)
{
var p2d = planeMapper.MapTo2d(pos);
p2d = MathUtils.ClipPointToPoly2d(p2d, v2ds);
pos = planeMapper.MapTo3d(p2d);
}
// If we're out of range there's no point casting a ray
// There's probably a better way to discard the entire lightmap
// if we're massively out of range