I had an interview recently and we discussed how would one project this spline representing a vehicles trajectory onto uneven terrain. I proposed something like stencil shadows instead of textures. This is a demo of that - there is a spline that can be moved, it’s above the terrain, and it projects a shadow basically.
It’s not the whole stencil shadow algorithm since it doesn’t compute any contours and such, but the way it writes to stencil is borrowed from there.
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Very interesting way of doing it using shadows for quick realtime interaction.
And coupled with offscreen scene and a THREE.WebGLRenderTarget it still can be converted back to texture/mask for more complex shenanigans.
This is very usefull, thanks for sharing!