public OCMeshBuilder FromMesh(UnityEngine.Mesh mesh) {
if(mesh == null) return this;
_vertices.AddRange(mesh.vertices);
_colors.AddRange(mesh.colors);
_normals.AddRange(mesh.normals);
_uv.AddRange(mesh.uv);
for(int i = 0; i < mesh.subMeshCount; ++i)
{
AddIndices(0, mesh.GetTriangles(i));
}
return this;
}
