How Can I Disable Culling for a USDZ File?

Question

Created Mar ’22

Replies 5

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I'm creating some AR trees for a research project and we're finally able to deploy the experience on Iphone after some updates made to reality converter.

The only issue is that since it is a tree, it is made up of mostly cross-sectional planes that serve as the leaf cards for the model. When placed in AR, QuickLook is culling the faces on the tree, even though it is set as a double sided material in XCode.

I can only select between cull front and cull back in XCode so I'm wondering if there is a way to change those options and export the USDZ so that when it is placed in AR it doesn't cull any of the faces.

The screenshot attached is of the settings panel under the leaf material for the tree.

Thanks!

Screen Shot 2022-03-31 at 3.17.00 PM.png

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Answer 1

Graphics and Games Engineer OP

Apple

Mar ’22

Hi! Which Xcode and OS version are you seeing this on? I know we've seen a similar issue before, and that should've been resolved in the most recent iOS 15/macOS 12 builds.

1

Answer 2

jutorres91 OP

Mar ’22

I'm currently running macOS Big Sur Version 11.6, and XCode version 13.1 (13A1030d). I'm downloading software updates right now for both macOS and XCode so I'll definitely check again after the updates install to see If I can fix the issue. Thanks for that suggestion!

0

Answer 3

jutorres91 OP

Apr ’22

Ok so I switched to one of the new mac minis at my office which is running Monterey 12.2.1 and Xcode version 13.2.1 (13C100). However I am still running into the same issue that the material allows me to check double sided but doesn't give me the option to remove culling :(

I've seen the Apple documentation regarding the faceculling property for physically based materials, and that theres an option to turn it off in the actual code, but I'm fairly new to Xcode development and have no idea how to view the code (if it's even possible) for a USDZ.

1

Answer 4

Graphics and Games Engineer OP

Apple

Apr ’22

Yes, we do have that face culling property, but that would only work if you are using PhysicallyBasedMaterial in an app, not through a usdz. Would you be able to provide us a sample usdz that reproduces this issue via Feedback Assistant? Post the feedback ID here and we can send it to the team to see if this is a bug or if there’s a workaround.

0

Answer 5

jutorres91 OP

Apr ’22

I've submitted the issue through feedback assistant and the feedback ID is FB9972973. Thank you for your help!

1