As an example of how you can use this stuff, here's a home-theater screen frame with built-in horizontal masking, and plans on how it could be extended to 4-way

As an example of how you can use this stuff, here's a home-theater screen frame with built-in horizontal masking, and plans on how it could be extended to 4-way masking: https://www.avsforum.com/threads/smx-simple-masking-experience-screen-build-recipe.3128652/ https://www.avsforum.com/threads/smx-simple-masking-experien...