Available space: How much space do you want this interface to take up? I made a mistake in my planning and made my interface larger than I wanted. My only thought was the size of the touching surface. This is important but I forgot the consequences of this decisions, and some of my math was wrong.
Size of screen/camera: The size of the touchable surface depends on the dimensions of the acrylic and also how much space the camera needs to see the whole of those dimensions.
Projection size: Along with the camera you need to consider the projection which will be thrown onto your touching surface. How much height do you need to make a projection of a particular size. Projector Central has calculator for many projectors, even if your projector is not an option you can get a good idea for the height you need. Alternatively you can simply point your projector at your acrylic, back up until its the size you want then measure with a tape measure how far away you are.
So what does this mean? It means the size of your acrylic touching surface (length x width) determines the height of the interface. This is because your light based materials (camera and projector) need a certain amount of space between the lens and the surface in order to fully cover it. Usually your projector will need more height (distance) than your camera.
So once you have some of these measurements sketch out your interface.
Schproket needs to be at least 35" tall in order to fill most of the acrylic (30"x24") and my camera needs to be slightly elevated to capture the full projection and not the full size of the acrylic. This will prevent inputs falling outside the screen size.
Now we can start building the frame for the interface.
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