As a 3D modeller, learning a BIM package means becoming accustomed to a very unfamiliar way of creating spaces. 3D animation suites, such as 3dsmax or Blender, primarily use meshes, arbitrary surfaces of polygons that enclose volumes without actually occupying the volume inside – it’s as if everything is hollow.
Revit is quite different. Here, every object has a volume, and some objects even have negative volumes – they’re effectively holes cut into walls or floors. For example, in the above image, the archway is an object, but one that occupies negative volume, cutting a hole through the brick wall.
Approaching Revit from a background in Blender, one of things I had to wrap my head around was the method of using reference planes and parametric relations to define the dimensions of a component. Revit may not be the most efficient tool if you need to model a hundred unique windows, but what if you can make just one window that is dynamically adjustable? Suddenly all this talk of parametric objects is much more appealing!