When running Babylon.js in a web worker using an OffscreenCanvas, it does not correctly invert images when loading textures. You can see the problem in this playground: https://playground.babylonjs.com/#NMPB99#5 [offscreen-canvas-bug] I found a way to work around this issue by supplying invertY …

Properly invert ImageBitmaps BabylonJS:master ← nmrugg:invert-imageBitmaps opened 06:26PM - 18 Sep 21 UTC (UTC) [nmrugg] nmrugg +14 …

When I open your playground in MacOS Chrome or Edge, I don’t see anything on the right canvas at all. Is this expected? This may be an unrelated issue but it is preventing me from repro’ing [image] [Screen Shot 2021-09-13 at 12.07.44 PM] (The PG does not work at all in Safari as transferControlT…

I was running on Linux. I’ll see if I can run a vm.

It works on the latest Chrome in Windows 10 for me. It must be a Mac issue. There is another post about a similar (or the same?) error. But that appears to have been fixed recently: Offscreen canvas issue - document is not defined

It seems it is a known caveat: [image] Support for offscreen canvas Announcements Hi. I saw you added use of ImageBitmap instead of Image class in a worker, but there is an issue. According to the WebGl spec UNPACK_FLIP_Y_WEBGL, UNPACK_PREMULTIPLY_ALPHA_WEBGL , UNPACK_CO…

Thanks for the reply. Very interesting. So, according to the spec “the equivalent ImageBitmapOptions should be used to create an ImageBitmap with the desired format.” This is how I fixed the problem by modifying LoadImage() to create the image in the desired format. Would you be intrested if I cre…

OffscreenCanvas textures are inverted

Bugs

Evgeni_Popov September 14, 2021, 10:07am 6

It seems it is a known caveat:

Topic		Replies	Views
Issue With Using Offscreen Canvas - Model Loading In With UVs off Bugs	1	1065	September 13, 2021
Make invertY flag more consistent across different texture loading scenarios Feature requests	0	85	August 12, 2024
Environment texture flipped when created using ImageBitmap Questions	3	92	April 3, 2025
Invert cubeTexture/environmentTexture Questions	5	311	December 16, 2020
Correct upside down Imgur image Questions	2	360	July 19, 2020

OffscreenCanvas textures are inverted

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