Your Unity asset 3D model may distort with complex shaders due to incorrect UV mapping, shader parameter mismatches, or missing vertex data (like tangents).
Stretched or poorly unwrapped UVs break texture-based shaders—for example, a parallax shader will distort if UVs are uneven. Wrong settings (e.g., too much tessellation) or missing attributes (needed for normals) also warp geometry.
Troubleshoot by simplifying the shader first (disable tessellation) to isolate the issue, then check your model’s UVs and export settings (ensure tangents/normals are included).