Is there a way to set roughness transmission mipmap resolution?

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) —

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.

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Is there a way to set roughness transmission mipmap resolution?

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