Ensure your textures are in a square power-of-two format (e.g., 2048x2048). If your GLB uses textures, remember that standard VRM (MToon) handles shadows differently. You may need to bake your lighting in Blender before exporting to GLB. 3. Fix the "T-Pose"
GLTF-2.0: Mesh. GLTF-2.0 /meshes/ No VRM extension. Vertex attribute. GLTF-2.0 /meshes/*/primitives/*/attributes. TANGENT (vec4) / VRM - The Library of Congress convert glb to vrm high quality