Projection systems in most instances require the screen image to have a hard edge.
There is a "fault" in the 3ds max Modify> Spotlight Parameters or Advanced Effects/Projector Map function since it does not offer a setting/option that allows Hotspot/Beam = Falloff/Field.
A simple script setup (provided by Alfred DeFlaminis at tech support) works quite well for a single projector/spotlight but to apply it individually to 40 projector/lights in a large building-projection/mapping visualization is very laborious.
Having an integrated feature would be very useful for projection visualizations and make the projection function in Max behave like it does in the real-world.
Thanks,
Stephen Scott