Parallax Mapping in Unity URP: Offsetting UVs by View Direction
Normal mapping cannot show bumps occluding each other. Parallax mapping fixes that with a one-line UV offset — and here is where the approximation breaks.
Shader
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Normal Mapping in Unity URP: Lighting in Tangent Space
How normal mapping fakes surface detail without extra geometry, and a complete URP shader that builds the tangent-space basis in the vertex shader.