Why is PBR 3D model missing when texture?

When a PBR 3D model’s texture is missing, it’s usually due to three common issues: mismatched texture maps, incorrect UV unwrapping, or incompatible shader settings. - **Mismatched maps**: Using the wrong type (e.g., specular instead of metallic) breaks PBR’s physical logic, so textures don’t render as intended. - **Bad UVs**: Overlapping or cropped UVs prevent textures from aligning correctly to the model’s surface. - **Shader incompatibility**: Non-PBR shaders (like older non-principled ones) can’t interpret PBR maps properly, leading to missing textures. To fix it, first confirm all PBR maps (albedo, metallic, roughness, normal) are assigned to the right shader slots. Then check UVs are non-overlapping and properly laid out.