Here is a feature of the room acoustic software ODEON that I have always wanted to use natively in Rhino3D. It is such an efficient way to follow reflections, identify focusing effects of concave surfaces and detect flutters.
Although ODEON adds colors to each reflection matching its order, it does not provide means to reshape the geometry in real time and optimise the effects for great acoustics. Working directly in Rhino3D and being able to reshape the geometry makes this useful visualisation trick a design tool.
Talking about focus, what happened to the sound emitted at one of the foci of an ellispoid?
The answer is of course that it focuses to the other focus! (That is right, one focus, two foci)
Acoustic Research & Design Ltd 
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