This is neat. I recall seeing something similar before: Preview gcode in OpenSCAD
I really wish openscad weren’t so slow. I get the feeling their underlying geometry library doesn’t use the best algorithms. But I assume it’s a ton of work to try to improve.
The speed really limits the ability to do certain things. I tried transforming a model to add a draft angle for casting, using a minkowski operation, and it eventually worked but it would not be feasible for everyday use on arbitrarily complex models.