USDZ Exporter Issue - alphaTest does not work correctly

Bugs
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1

Hi, I’ve noticed that when using the PBRMaterial.PBRMATERIAL_ALPHATEST mode, the material on the exported USDZ model is not transparent.

I tested exporting to GLB, and transparency works correctly there. Exporting to USDZ works correctly with PBRMATERIAL_ALPHABLEND, but not with PBRMATERIAL_ALPHATEST.

I have prepared the playground to reproduce this issue:

Btw. I needed to add setTimeout to avoid this error in Tools.Download function:
“OffscreenCanvas.convertToBlob: Cannot get blob from empty canvas. ToBlob tools.ts:895 p dumpTools.ts:200”

Mabye you use offscreen canvas to transform textures and it is not ready to be downloaded, or the size is empty, because the texture is not loaded yet. I am not sure.

2

cc @alexchuber

4

Will take a look today :slight_smile:

Btw. I needed to add setTimeout to avoid this error in Tools.Download function:
“OffscreenCanvas.convertToBlob: Cannot get blob from empty canvas. ToBlob tools.ts:895 p dumpTools.ts:200”

It’s probably that the texture hasn’t finished loading yet, and the exporter doesn’t check (or wait) for it. Sounds like we should change that.

5

Alpha fix:

Texture-not-being-ready fix coming shortly :slight_smile:

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6

Great work, thank you! I’ve also tested it on my models, and it works perfectly.

7

Glad to hear, and thanks for all your testing of the USDZ exporter!

Nested in this PR is a fix for the texture timing problem (though I know you already found a workaround :slight_smile: )

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