Shder use scene's depthmap to displace a plane

Questions
1

the plane needs to be always over the background landscape, how can in use the scene’s depthmap to displace the geometry?

2

You can’t access the depth buffer directly. If you want to access is, you have to create/manage/render to/use… a WebGLRenderTarget with a depth attachment, then pass the depth target.texture as a uniform for a custom shader to displace with, or you might be able to get away with using it in plane.material.displacementMap = depthTarget.texture
Your plane may need many subdivisions to get something interesting.

2 Likes
3

Thanks! so i add a camera to the scene, render a depth texture to use it? wouldnt there be a simpler way to get it (like in unity/unreal)?

4

I just re-read your question and I might be overthinking what you need.

You sure you don’t just want:

depthTest:false,depthWrite:false,transparent:true.
and mesh.renderOrder = 10;

on your plane? (causing it to always render last, and on top of what was there before)

Or are you trying to actually warp a mesh to a depth buffer?

By default in webGL you can’t access the contents of the main display buffer, only rendertargets.