To fix weird shading in tree 3D models, correct inverted normals, adjust UV mapping, refine materials, and preview in your target engine.
- **Inverted Normals**: Flipped normals (common on leaves/branches) cause dark, unnatural patches. Use your 3D software’s "recalculate normals" tool (set to "outside" for tree surfaces). - **UV Mapping**: Stretched or overlapping UVs make bark/leaves look splotchy. Unwrap UVs or align shells to match texture scale for consistent shading. - **Materials**: Trees have minimal shine—lower specular intensity or increase roughness to avoid unnatural reflections. - **Engine Preview**: Test in Unity/Unreal to rule out engine-specific issues (some settings don’t translate directly).