@spidersharma
The mergeVertices function in BufferGeomtryUtils should do just that. It indexes your geometry so vertex attributes are shared and then you can calculate smooth normals.
It doesn’t sound like that’s the problem, though. If the model has smooth shading in other applications then it sounds like the geometry should already be smoothed.
@Alright I see you asked a similar question before – can you post your material creation code? Is flatShading enabled? Otherwise providing the model would be helpful.