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parametrically change a projectors frustum

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I created a simple shape that represents the frustum of a projector. I have to change this (zoom angle and projection distance) to place the projector to a specific place in a room to fill the designed screen. I can do this in sketchup, but I am transitioning to Archicad. How can I add these parameters to modify the mesh/morph? I am really a beginner here, so go easy please I have attached my first try.

I have not viewed the object due to version limitations.

Did you code your shape or is it from a Save as object...?
distance = screen_size / ( 2 * tan(lens_angle / 2) )
You can use the above to calculate the distance for a given projected size and lens angle.

AC18-23 AUS 7000
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