Here are a couple of 3D modeling and rendering examples I made using Autodesk Maya.
Unity is a very good 3D game engine but it is not a 3D package as it is not possible to build complex meshes right into Unity’s scene editor.
3D packages like Maya, 3ds Max or Blender provide a wide set of tools for making 3D polygonal models used in games, but they also offer animation tools, UV mapping features, high quality rendering and a lot of advanced stuff used by people making movies, architects, product designers, etc.
As for creating 3D games, knowing how to model using a 3D package is almost mandatory.
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