Hi all–I have scoured the internet and researched for 6 weeks and have learned all about the new node-based shader system in order to attempt a solution to this, but have had no luck.
My question is this: In three.webgpu.js, how can I selectively disable the logarithmic depth buffer? Ultimately I want to only disable the logarithmic depth buffer just for depth textures, but leave it enabled for all other rendering.
In three.webgpu.js there is a tiny bit of code that is making the fragment depth value logarithmic when the logarithmicDepthBuffer option is true. Whatever depthNode is set to, determines the depth strategy. This is the existing code on line 32506 in three.webgpu.js v168:
// three.webgpu.js v168 (line 32506)
// https://unpkg.com/browse/three@0.168.0/build/three.webgpu.js
const fragDepth = modelViewProjection().w.add(1);
depthNode = fragDepth.log2().mul(cameraLogDepth).mul(0.5);
I would like to make use of a uniform node to selectively enable or disable the logarithmic depth buffer. This is what I have so far:
const myUniform = uniform('float');
myUniform.value = 0; // 0 = false, 1 = true; boolean uniforms not supported yet
const fragDepth = modelViewProjection().w.add(1);
const logarithmicDepth = fragDepth.log2().mul(cameraLogDepth).mul(0.5);
depthNode = select(myUniform.equal(1), logarithmicDepth, ??? );
^^^ As you can see in my code above, what do I put in place of ??? (question marks)? Whatever is used there will be just the standard (non-logarithmic) depth node. I have tried using the local variables fragDepth, positionView.z, and all sorts of constant float values. Some values cause the renderer to crash, and some are still able to render the scene but the depths are all messed up.