SheenWoodLeatherSofa

[echadwick-artist]

Asset with high quality textures, Sheen and Specular and Webp extensions, and demonstrating the use of three UV methods.

[rsahlin]

Excellent model @echadwick-artist - great to see one with 3 uv coordinates! Since this is intended as high quality (hero) asset I see no problem with using PNG textures (or high quality JPEG). There is definetly value in knowing what the transfer size will be for realistic quality models. We cannot keep persuing the red-herring that you can get wanted quality with a fixed size budget.....

Perhaps the default can be PNG - and webp can be in a separate folder just like we have some with Draco compression?

[emackey]

Hi @echadwick-artist, beautiful model!

There's an export error here that you might need to work with engineers at DGG to get resolved in software. You can see the glTF Validator caught it, which is why there's a red "X" on the commit above.

The glTF textures list is only allowed to reference PNG and JPG. So when using WebP, this kind of thing is illegal:

  "textures": [
    {
      "sampler": 0,
      "source": 0
    },

If the source is WebP format, you must use the extension instead:

  "textures": [
    {
      "sampler": 0,
      "extensions": {
        "EXT_texture_webp": {
          "source": 0
        }
      }
    },

I see you have the extension listed in extensionsUsed and extensionsRequired already, so that part is good.

This is a technical nitpick, but of course one we would need to have fixed for the sample asset. Thanks!

[echadwick-artist]

AFAIK we've made a conscious decision NOT to include source assets. We've omitted the "source assets" section, which used to be in the glTF Sample Models repo. So I probably shouldn't include PNG textures, unless the quality loss is too extreme. I did use PNG for the big normal map on the wood frame, but for the rest of the textures, WEBP seems to be working ok.

I didn't use any DGG toolsets, since this model uses very specific manual workflows... custom vertex ordering for alpha blend, custom UV setups, etc. I compressed the textures individually, and manually replaced them into the JSON. And I did it incorrectly, thanks for explaining the fix! I misread the validator as simply not supporting the WEBP extension, oops.

[lexaknyazev]

I did use PNG for the big normal map on the wood frame

Have you considered WebP lossless (for all normal maps)? It usually produces smaller file sizes than PNG while keeping the images intact.