I was trying to create THREE.CubeTexture using 6 different THREE.CompressedTextures and realized that the CubeTexture does not support CompressedTextures. I opened this issue but have not received any feedback: https://github.com/mrdoob/three.js/issues/16584 Does anyone have any opinion on this? I’…

Before doing a PR, can you please demonstrate the issue with simple live demo ? For example you could refactor the following demo so it uses compressed textures: https://threejs.org/examples/webgl_materials_cubemap.html When looking at WebGLTextures, setTextureCube() does handle compressed textures…

@Mugen87 Thanks for the suggestion. I compressed the 6 textures used in the example to KTX format using S3TC compression, tested them with a KTXLoader and mapped them to a cube to make sure they are valid textures. Then I changed only this line: mrdoob/three.js/blob/abe8031a3ed8d04bb80aab5…

@Mugen87 And this is what happens when I load these 6 KTX textures using a KTXLoader and create the CubeTexture like: new THREE.CubeTexture(textureImagesAry): [16] As specified in the error mesage, texImage2D is called instead of compressedTexImage2D.

The problem might be here: https://github.com/mrdoob/three.js/blob/b50a9d6c88494088911ab600f77109b8161e3dd2/src/renderers/webgl/WebGLTextures.js#L373 As the texture variable here is a THREE.CubeTexture, therefore .isCompressedTexture property is undefined / false.

Is it possible for you to share your code as a github repo? I want to have a closer look at this issue by myself :innocent: In any event, your findings are already very interesting!

@Mugen87 Here’s the repo: https://github.com/oguzeroglu/threejs_compressed_cubemap_bug Clone the repo and start a webserver (I use “python -m SimpleHTTPServer”) There are 3 HTML files: withJPG.html -> This is the normal, working version with JPG textures withKTX.html -> This is almost the same …

[image] oguzeroglu: THREE.CubeTextureLoader does not go well with compressed textures CubeTextureLoader is definitely not designed for compressed textures and I think it’s no good to add support for it. Otherwise it would rely on too many loaders from the examples. So let’s assume you create…

Yes I had the same problem, it was complaining about the buffer size and yes I can confirm that they are actually valid textures. It is not supposed to call textImage2D anyway. That’s the problem. It’s supposed to call compressedTexImage2D. So the error message you posted is probably caused by Compr…

[image] oguzeroglu: It is not supposed to call textImage2D anyway. But the compressed textures have RGBFormat format. compressedTexImage2D() is only called for certain texture compression formats (like e.g. RGB_S3TC_DXT1_Format or RGB_ETC1_Format).

Ah, this might be the case as the KTX files are compressed with S3TC, I think they should be used with compressedTextImage2D. I’ll investigate if this line causes the problem: oguzeroglu/threejs_compressed_cubemap_bug/blob/1867376ae85f997d3b5b642f4171934826043a07/withCompressedTextures.html…

THREE.CubeTexture using THREE.CompressedTexture

Questions

Mugen87 June 1, 2019, 6:07pm 13

Do you want to make a PR with the fix for WebGLTextures? I think this is something that needs to be corrected in the library.

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THREE.CubeTexture using THREE.CompressedTexture

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