fix: flip normals when facing away from light/view — fixes cube lighting

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Root cause: cube.obj has inconsistent winding order. Many faces have
normals pointing inward (e.g. back face normal = +Z instead of -Z).
With cullMode=None, both sides render, but inward normals cause:
- No diffuse lighting (NdotL < 0 → max() = 0)
- Wrong shadow bias (slope-dependent bias uses wrong NdotL)
- Inconsistent shadow edges on cube faces

Fix: in fragment shader, flip normal if dot(N,L) < 0 or dot(N,V) < 0
This is the standard approach for double-sided rendering with
non-watertight geometry or inconsistent winding order.

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This commit is contained in:

emil28092005

2026-06-18 21:53:15 +03:00

parent 203c22fa98

commit 2f7430e3b1

3 changed files with 16 additions and 4 deletions

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src/Engine.Graphics.Vulkan/Shaders/triangle.frag.spv

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