[r87] Light and shadow not appearing on all the surfaces of this demo

[trusktr]

It turns out this is because Three.js Meshes with PlaneGeometry currently don’t cast shadows by default, and the workarounds can introduce unwanted artefacts:

Make DOM element receive shadow and shine from PointLight

Ah, it’s a bug. Here’s the demo with red squares made from thin BoxGeometries instead of PlaneGeometries, and shadow casting now somewhat works with some obvious glitchyness, and the polygon count increased by a factor of 6: Here’s another demo more clearly showing the glitchy shadow effect when the Plane (Box) is not thick enough (line 145): Would you consider these glitchy effects a bug?

(Sorry for that duplicate thread, I forgot about this one!)

It’d be great to come up with a solution. I started some thought about it on GitHub.