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Fix blocky terrain SDF

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#3975
This commit is contained in:
Wojtek Figat
2026-03-11 19:25:18 +01:00
parent 96bbae8e28
commit 22c88eb59d
4 changed files with 18 additions and 11 deletions
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11
Source/Engine/Terrain/Terrain.cpp
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@@ -549,19 +549,22 @@ bool Terrain::DrawSetup(RenderContext& renderContext)
const DrawPass drawModes = DrawModes & renderContext.View.Pass;
if (drawModes == DrawPass::GlobalSDF)
{
const float chunkSize = TERRAIN_UNITS_PER_VERTEX * (float)_chunkSize;
const float posToUV = 0.25f / chunkSize;
Float4 localToUV(posToUV, posToUV, 0.0f, 0.0f);
const float chunkScale = 0.25f / (TERRAIN_UNITS_PER_VERTEX * (float)_chunkSize); // Patch heightfield is divided into 4x4 chunks
for (const TerrainPatch* patch : _patches)
{
if (!patch->Heightmap)
continue;
GPUTexture* heightfield = patch->Heightmap->GetTexture();
float size = (float)heightfield->Width();
Float4 localToUV;
localToUV.X = localToUV.Y = chunkScale * (size - 1) / size; // Skip the last edge texel
localToUV.Z = localToUV.W = 0.5f / size; // Include half-texel offset
Transform patchTransform;
patchTransform.Translation = patch->_offset + Vector3(0, patch->_yOffset, 0);
patchTransform.Orientation = Quaternion::Identity;
patchTransform.Scale = Float3(1.0f, patch->_yHeight, 1.0f);
patchTransform = _transform.LocalToWorld(patchTransform);
GlobalSignDistanceFieldPass::Instance()->RasterizeHeightfield(this, patch->Heightmap->GetTexture(), patchTransform, patch->_bounds, localToUV);
GlobalSignDistanceFieldPass::Instance()->RasterizeHeightfield(this, heightfield, patchTransform, patch->_bounds, localToUV);
}
return true;
}