emil28092005
d2078f3ee0
Root cause: ALL 12 faces in cube.obj had reversed winding order. This caused every face normal to point inward, breaking: - Diffuse lighting (NdotL < 0 → no light on any face) - Shadow bias (slope-dependent bias used wrong NdotL) - Shadow self-shadowing (both sides rendered with CULL_NONE) Fix: reversed all face indices to correct CCW winding: - Back face: f 1 4 3, f 1 3 2 (was f 1 2 3, f 1 3 4) - Front face: f 5 6 7, f 5 7 8 (was f 5 7 6, f 5 8 7) - Left/Right/Bottom/Top: all reversed Now MeshMath.ComputeFaceNormal produces correct outward normals. Normal flip in shader (dot(N,V) < 0) is still kept as safety for double-sided rendering, but cubes now have correct normals natively.
34 lines
669 B
Plaintext
34 lines
669 B
Plaintext
# Simple unit cube — consistent CCW winding (viewed from outside)
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v -0.5 -0.5 -0.5
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v 0.5 -0.5 -0.5
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v 0.5 0.5 -0.5
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v -0.5 0.5 -0.5
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v -0.5 -0.5 0.5
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v 0.5 -0.5 0.5
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v 0.5 0.5 0.5
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v -0.5 0.5 0.5
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# Back face (normal -Z, CCW from outside = looking from -Z)
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f 1 4 3
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f 1 3 2
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# Front face (normal +Z, CCW from outside = looking from +Z)
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f 5 6 7
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f 5 7 8
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# Left face (normal -X, CCW from outside = looking from -X)
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f 1 5 8
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f 1 8 4
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# Right face (normal +X, CCW from outside = looking from +X)
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f 2 3 7
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f 2 7 6
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# Bottom face (normal -Y, CCW from outside = looking from -Y)
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f 1 2 6
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f 1 6 5
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# Top face (normal +Y, CCW from outside = looking from +Y)
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f 4 8 7
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f 4 7 3
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