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Better handling of clipped shadows

This commit is contained in:
Jarrod Doyle 2024-10-28 07:38:37 +00:00
parent 926497b2c2
commit 1282c6be19
Signed by: Jayrude
GPG Key ID: 38B57B16E7C0ADF7
1 changed files with 43 additions and 23 deletions
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66
KeepersCompound.Lightmapper/Program.cs
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@ -450,38 +450,39 @@ class Program
pos += x * 0.25f * renderPoly.TextureVectors.Item1;
pos += y * 0.25f * renderPoly.TextureVectors.Item2;
// We need to clip the point to slightly inside of the poly
// to avoid three problems:
// 1. Darkened spots from lightmap pixels who's center is outside
// of the polygon but is partially contained in the polygon
// 2. Darkened spots from linear filtering of points outside of 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 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
var direction = pos - light.Position;
if (direction.LengthSquared() > light.R2)
if ((pos - light.Position).LengthSquared() > light.R2)
{
continue;
}
// We cast from the light to the pixel because the light has
// no mesh in the scene to hit
var hitResult = scene.Trace(new Ray
var hit = TraceRay(scene, pos, light, false);
if (!hit)
{
Origin = light.Position,
Direction = Vector3.Normalize(direction),
});
// TODO: This is still wrong because it clips when a ray should
// be missing, potentially leading to uneven shadows along a
// shadow edge
// We need to clip the point to slightly inside of the poly
// and retrace to avoid three problems:
// 1. Darkened spots from lightmap pixels who's center is outside
// of the polygon but is partially contained in the polygon
// 2. Darkened spots from linear filtering of points outside of 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
//
// The reason we don't do this before the first cast is because it can
// cause incorrect shadows along cell edges on a flat plane.
var p2d = planeMapper.MapTo2d(pos);
p2d = MathUtils.ClipPointToPoly2d(p2d, v2ds);
pos = planeMapper.MapTo3d(p2d);
hit = TraceRay(scene, pos, light, true);
}
// cheeky epsilon
// TODO: Some pixels aren't hitting and I'm not sure why
var hit = hitResult && Math.Abs(hitResult.Distance - direction.Length()) < MathUtils.Epsilon;
if (hit)
{
// If we're an anim light there's a lot of stuff we need to update
@ -513,6 +514,25 @@ class Program
});
}
private static bool TraceRay(Raytracer scene, Vector3 point, Light light, bool rangeCheck)
{
// If we're out of range there's no point casting a ray
var direction = point - light.Position;
if (rangeCheck && direction.LengthSquared() > light.R2)
{
return false;
}
// We cast from the light to the pixel because the light has
// no mesh in the scene to hit
var hitResult = scene.Trace(new Ray
{
Origin = light.Position,
Direction = Vector3.Normalize(direction),
});
return hitResult && Math.Abs(hitResult.Distance - direction.Length()) < MathUtils.Epsilon;
}
private static void SetCellLightIndices(WorldRep wr, Light[] lights)
{
// TODO: Move this functionality to the LGS library