How to solve model rotation around a random point issue ?

[udayk07]

We are trying to implement marker based detection in AR. While loading the model on marker detected, users can not rotate ( some specific models ) around its center instead it rotates around some random point ( it may be transform issue ). Is there any workaround available in sceneform to resolve this issue ?

Sample model:

test_rotation_issue.zip

Screen recording:
https://user-images.githubusercontent.com/78372917/148204264-82eea9ba-eabf-433e-a3f0-a70f8f99c6f9.mp4

Thanks in advance.

[RGregat]

A first quick look.
The origin of the model is not correct

[RGregat]

can you checkout this model?
test_rotation_issue_changed_origin.glb.zip

[udayk07]

@RGregat Thanks for the quick response. The given orgin changed model works fine.

Is there any workaround to handle these type of models in sceneform ( as those models are dynamically uploaded from users end ) ?

[grassydragon]

Yes, you can use the Filament bounding box to scale and center the model: https://github.com/google/filament/blob/main/android/filament-android/src/main/java/com/google/android/filament/Box.java

An example of accessing the Filament bounding box: #243 (comment)