The images below are examples of design studies looking exclusively at form, proportion, and spatial qualities. It is best to do this in a context that is 'de-materialized' because if we know we have this right without the influence or distraction of the visual impact of material selection, we may then proceed with confidence in the underlying architectural composition.
This is why, in architectural studios in school, professors will often insist that models be built with a single material, such as white museum board.
The advantage of modeling digitally in virtual reality, or course, is that this asset will continue to serve the project as it matures to eventually include finishes, lighting, and increasing levels of architectural detail. We put clients in their spaces before they exist, where they may evaluate the constellations of design options with accurate visual feedback.