How to get pixel location inside a fragment shader?

[Leonidas]

Hi @simmania,

To get the vertex world position for the rendered pixel, if you are using shader chunks then it’s available on this varying:

vPositionW

You could pass the world position of the origin as uniform, then subtract the above to get the local relative position.

If you’d like even more precision like the actual world position of each pixel then you will need to reconstruct the world position from the depth. I don’t have an example in mind for that, but there is this older post that is quite relevant:

Position from depth

So I’ve been trying to reconstruct the position from depth, with no success … This is how I construct inverse projection matrix: var vm = this.camera.camera.viewMatrix.clone(); var pm = this.camera.camera.projectionMatrix.clone(); var f = new pc.Mat4(); f.mul2(pm, vm); f.invert(); scope.resolve("invViewProj").setValue( f.data ); These are my shader functions: float unpackFloat(vec4 rgbaDepth) { const vec4 bitShift = vec4(1.0 / (256.0 * 256.…

Hope that helps.