It's interesting how the OBJ appears smooth in my 3D modeling software but looks somewhat quirky and triangular in the Three.js scene. I've applied MeshLambertMaterial to it, which supposedly uses THREE.SmoothShading as its default shading. Despite manually setting the shading property and confirming through debugging console that it is properly configured, the model in the scene still lacks that desired smooth appearance.
The OBJ(MTL)Loader does not automatically calculate the VertexNormals. However, you can manually calculate them later on like this (not verified):
myModel.traverse( function( item ) {
if ( item instanceof THREE.Mesh ) {
item.geometry.computeVertexNormals();
}
} );
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