Renders 3D models in the Desmos Graphing Calculator! There is a version of this at this link if you want to play with it! (It will be outdated to the current version because I don't feel like updating the website every time I add a new feature
The file upload at the bottom of the web page allows you to upload custom .obj files to render.
When exporting the .obj file from Blender (I recommend exporting from Blender), you must unselect everything from the geometry tab except "Triangulate Faces"
The maximum amount of triangles in a model is 64 (otherwise, the renderer will be EXTREMELY slow)
I copied and pasted a bunch of code from this repo by OneLoneCoder. Please check it out!