SchoolCAD Render Studio engine

schoolcad-three.js bundles, unchanged except where noted:

- three.js 0.187.0 (https://threejs.org), MIT licence, LICENSE-three.txt
- three-mesh-bvh 0.9.17 (https://github.com/gkjohnson/three-mesh-bvh), MIT licence, LICENSE-three-mesh-bvh.txt
- three-gpu-pathtracer 0.0.28 (https://github.com/gkjohnson/three-gpu-pathtracer), MIT licence, LICENSE-three-gpu-pathtracer.txt
  Change: the console deprecation notice in WebGLPathTracer's constructor is removed.

Built with esbuild by tools/vendor-three.mjs. Everything runs in the student's browser; nothing is uploaded.