: While an .obj file defines the 3D geometry (vertices and surfaces), the .mtl file describes how those surfaces appear. Without it, a model may appear as a simple, untextured gray or white mesh.
: These industry-standard tools natively support .mtl imports during the .obj loading process to maintain consistent visual fidelity. MegaOne MTL.7z
: Drag both the .obj and .mtl files into the Unity Project panel simultaneously to automatically apply materials. : While an
Importing OBJ with MTL Texture doesn't work - Unity Discussions MegaOne MTL.7z