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Fix: reversed floor mesh

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Fixed the bug where the floor appeared only seen from below sometimes. (To be more precise, it appeared when the SVG geometry was counter-clockwise)
This commit is contained in:
Banane_Rotative
2025-12-08 10:10:33 +01:00
parent f0a2cec172
commit a563490395
1 changed files with 23 additions and 5 deletions
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28
Assets/Editor/SvgToFlatMeshEditor.cs
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@@ -295,11 +295,23 @@ public class SvgToFlatMeshEditor : EditorWindow
// Add indices (triangles) // Add indices (triangles)
for (int i = 0; i < g.Indices.Length; i += 3) { for (int i = 0; i < g.Indices.Length; i += 3) {
// VectorUtils yields triangles in clockwise winding int i1 = baseIndex + g.Indices[i];
// Unity is supposed to use clockwise as well, but in practice we find we need to flip the order to get correct facing. int i2 = baseIndex + g.Indices[i + 1];
indices.Add(baseIndex + g.Indices[i + 1]); int i3 = baseIndex + g.Indices[i + 2];
indices.Add(baseIndex + g.Indices[i]); if (!IsClockwise( g.Vertices[i1], g.Vertices[i2], g.Vertices[i3] ))
indices.Add(baseIndex + g.Indices[i + 2]); {
// Add triangle with reversed winding
indices.Add(i1);
indices.Add(i3);
indices.Add(i2);
}
else
{
// Add triangle with correct winding
indices.Add(i3);
indices.Add(i1);
indices.Add(i2);
}
} }
baseIndex += g.Vertices.Length; baseIndex += g.Vertices.Length;
@@ -317,6 +329,12 @@ public class SvgToFlatMeshEditor : EditorWindow
return mesh; return mesh;
} }
// Helper to determine if 3 points are in clockwise order
bool IsClockwise(Vector2 a, Vector2 b, Vector2 c)
{
return (c.y - a.y) * (b.x - a.x) > (b.y - a.y) * (c.x - a.x);
}
// Build an extruded Mesh from geometries // Build an extruded Mesh from geometries
Mesh BuildExtrudedMeshFromBeziers(List<BezierPathSegment[]> beziers, Vector2 geomsCenter, float globalScale, float height){ Mesh BuildExtrudedMeshFromBeziers(List<BezierPathSegment[]> beziers, Vector2 geomsCenter, float globalScale, float height){
// Forget about UVs (unnecessary for our use case) // Forget about UVs (unnecessary for our use case)