Question: Representing an object as a linear combination of models is often represented as abstraction, because we can regard adjusting the coefficients as obtaining the same view of different models. Furthermore, we could get a parametric family of models by adding a basis element to the space. Explore these ideas by building a system for matching rectangular buildings where the width, height and depth of the building are unknown parameters. You should extend the linear combinations idea to handle orthographic cameras - this involves constraining the coefficients to represent rotations.