The part of a 3D program or 3D package which provides an interface for the placement, animation, and some times texturing of 3D objects.

In many 3D programs such as Ray Dream, Infini-D, Carrara, Strata 3D it is a mode, almost always the root mode of the application.

In the case of programs like Lightwave, the scene editor is a separate application from the modeler, but it also contains the renderer, there are further instance where all three functions are separate programs.