A ray-optics sandbox — mirrors, glass, filters, lenses. Build a rig, fire light, watch it bend.
Place
Beam
Selection
Nothing selected — click an object to edit it, or drag on the canvas with a tool above to place a new one.
Select — drag bodies to move, drag small handles to reshape/rotate. Sources — drag the little dot to aim the beam. Glass/lens/prism bend light by Snell's law; mirrors reflect; walls absorb; filters tint.