OpenSCAD’s own language is where a lot of people give up on scripting their models. LuaCAD swaps it for Lua 5.4 embedded in a Rust engine, with operator overloading so union, difference and intersection read as a + b, a - b, a * b. Exports 3MF, STL, OBJ, PLY, OFF, AMF or SCAD. The playground is WebAssembly — nothing installs, nothing uploads.