guanglei

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  1. I'm reading the source code, and I'm a bit confused about the difference between mesh and submesh. So when I call `Mesh.createGround` I created a Mesh(with transform matrix, geometry and material), right? But what is submesh for? Is that when I set the parent mesh (`groundMesh.parent = sphereMesh`, eg), the groundMesh became a submesh? I'm not sure.