In some cases, there is no strict distinction between these phases; in such cases modeling is just part of the scene creation process (this is the case, for example, with Caligari trueSpace and Realsoft 3D).
在有些情况，这些阶段之间没有严格的区别，在这些情况下，建模只是场景创建过程的一部分（例如Caligari trueSpace就属于这种情况）。