thanks for the advice. I initially thought about a ray tracer, but it would be overkill.
I found this neat little app which does what I want. https://chrome.google.com/webstore/detail/ray-optics-simulation/egamlemiidmmmcccadndbjjihkcfiobh
Tom
I would like to simulate a light ray hitting and refracting through a transparent freeform shape.
Any advice on software which will do this easily? I want to just draw the shape, point the light at it, and see where the beam goes.
Tom