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if you want to customize the size of each part of any 3d object then I think you must seperate 3d objects and import them in JavaFX MeshView then only you can use ScaleX,ScaleY,ScaleX. TraiangleMesh is not a node so it doesn't contain the scale property.
Thanks. I realized that it will be some work, but I can just manipulate it as I see fit. I realized that the original sizes will be given, and that' all I need. I kept thinking I would need to keep redoing things, but that isn't the case.