A textbook figure is already finished: you cannot nudge the prism, move the lamp, or trace the ray again. We wanted the other kind of freedom — put a scheme down, change one thing, and watch what the light does. Loomrume grew out of that.
About
Why Loomrume exists, and what kind of light it can show.

This is not a lab, and we do not pretend the picture is a real experiment. The rays are computed by a model. That is usually enough to see why a scheme behaves the way it does.
Ready examples
Write to us
If a ray looks wrong, or a scheme you need is missing, write to us. We read the mail and we answer. hello@loomrume.com
Some of the usual questions are already answered in the FAQ.