ReluxDesktop includes diverse options for modelling 3D objects.

Closed solid bodies (Cuboids and 3D objects) can be subtracted from each other, united or intersected. 

This then opens up a large number of new options for designing the scene.

Boolean object types

Difference:  one or more objects are subtracted from an initial object. This can be used to punch a hole in an object, for example.

Union:  a number of objects are combined to form a new object. This can be used to avoid penetrations, for example.

Intersection: a number of objects are intersected so that the only volume that remains is that which is enclosed by all the objects in question. 

This can be used, for instance, to create a new shape from different existing shapes.