ARFoundation Scale Not Matching Real World Dimensions

[nithishakumar]

I have a desk that is about 72 cm tall. I created a cube in Blender of size 72 cm x 72 cm x 72 cm and exported it as a .obj model: I placed the cube (with a scale factor of 1) next to the desk. The cube is a little shorter than the height it is supposed to be. You can check the cube's size in this video: https://www.youtube.com/watch?v=5SnEQumvs6g

This is the source code I have: https://github.com/nithishakumar/CubeAR/tree/main/Cube/Assets

I use a modified version of the PlaceOnPlane.cs script (to prevent UI raycasting) to place the cube.

Please check the "UI & AR scripts" folder for the modified PlaceOnPlane.cs script and the "Cube" folder for any other important info.

I'm unsure of why the cube is not tall enough. Any help would be appreciated!

[andyb-unity]

How does the size compare if you just create a 3D cube primitive in Unity and set its scale to .72 in all dimensions? This test would help determine if the scaling issue is caused by your asset or something else.

[Krustin]

Did you change the position of AROrigin?

[nithishakumar]

How does the size compare if you just create a 3D cube primitive in Unity and set its scale to .72 in all dimensions? This test would help determine if the scaling issue is caused by your asset or something else.

@andyb-unity I tested this out with the 3D cube primitive that has a scale factor of 0.72 in all dimensions. However, I am facing the same problem. It is not tall enough.

[nithishakumar]

Did you change the position of AROrigin?

@Krustin Nope, the ARSessionOrigin is at (0,0,0) with a scale factor of 1 in all dimensions.

[ACWesterberg]

How does the size compare if you just create a 3D cube primitive in Unity and set its scale to .72 in all dimensions? This test would help determine if the scaling issue is caused by your asset or something else.

@andyb-unity I tested this out with the 3D cube primitive that has a scale factor of 0.72 in all dimensions. However, I am facing the same problem. It is not tall enough.

@nithishakumar you probably have, but I'm asking just in case. Are you sure that the bottom of the cube is aligned to the ground properly? I.e. the pivot point is at the height of the plane. And you don't happen to have AR Scale Interactable or similar on the object? That component will scale the object to the max value set.

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[andyb-unity]

Closing this issue due to inactivity. Feel free to re-open it if you have further questions. @ACWesterberg has some good suggestions for further investigation.