Is there a way to set roughness transmission mipmap resolution?

drcmda · July 19, 2021, 10:27am

It currently looks really chunky Basic demo (forked) - CodeSandbox

the fat pixels are also flipping as the transmission surface moves around. is there any way to mitigate this?

orion_prime · July 20, 2021, 11:20am

i think some of the devs are already working on the improved version https://twitter.com/superhoge/status/1417390236527566850
might just have to wait

donmccurdy · July 20, 2021, 8:26pm

At present the transmission render target is a fixed 1024x1024 (with lower mips used for rougher surfaces, I believe) —

github.com

mrdoob/three.js/blob/ec5fb63a0b557474844f458065e5b26a22667e4e/src/renderers/WebGLRenderer.js#L1241-L1248

    
      
          			_transmissionRenderTarget = new renderTargetType( 1024, 1024, {
          				generateMipmaps: true,
          				type: utils.convert( HalfFloatType ) !== null ? HalfFloatType : UnsignedByteType,
          				minFilter: LinearMipmapLinearFilter,
          				magFilter: NearestFilter,
          				wrapS: ClampToEdgeWrapping,
          				wrapT: ClampToEdgeWrapping
          			} );

I think making it configurable could be useful, but it is not totally straight-forward: the texture must be POT square in WebGL 1 (i.e. cannot generally be the same resolution as the viewport). There’s a little discussion in https://github.com/mrdoob/three.js/pull/21884, and more improvements may be possible with WebGL 2.

trusktr · February 12, 2023, 2:03am

We really need this, especially for non-game experiences (f.e. glass on a UI).

drcmda · February 12, 2023, 11:03am

github.com/mrdoob/three.js

ShaderChunk: Implemented mipped bicubic transmission texture filtering.

mrdoob:dev ← mrdoob:transmission_bicubic

opened 01:43AM - 12 Feb 23 UTC

mrdoob

+94 -11

**Description** The current transmission shader technique makes the 0.25-0.75… roughness ranges pretty unusable due to the artefacts. This PR implements @N8python's [shader](https://www.shadertoy.com/view/Dl2SDW) for sampling the texture using bicubic filtering. ![Screen_Shot_2023-02-11_at_3 53 48_PM](https://user-images.githubusercontent.com/97088/218288515-b991be6d-58a4-4db1-9e1a-be4e733dbdac.png) (Left side: bilinear, Right side: bicubic) Haven't done performance comparisons yet.

dsine-de · October 30, 2023, 8:37am

This has been reverted in newer releases, right? I’m currently having the same problem.

renaud · December 5, 2023, 10:55am

Hi, is it possible to set the size of transmission render target ?

donmccurdy · December 5, 2023, 3:12pm

No, resizing the transmission render target is not currently supported.

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Is there a way to set roughness transmission mipmap resolution?

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