Weird shading in tree 3D model textures typically stems from misaligned normal maps, UV stretching, low texture resolution, or mismatched lighting. Normal maps not aligned with the model’s surface create unnatural bumpiness on leaves/bark. UV stretching distorts details like leaf veins or bark knots. Low-res textures blur edges, while harsh lighting amplifies these flaws.
Fix it by first checking normal map orientation (flip Y/Z axis if your software suggests). Use UV unwrapping tools to correct stretching, then test soft, diffused lighting to smooth odd shadows.