Scale or position issues

[adrianposteuca]

Hi all,

I have an AR positioning issue ( or it may be scale). Can you help?

• Request feature add in the model viewer editor a View in AR button

I have the 3d model out of C4D with a scale close to the reality of a window! With the root set to (0,0,0) in the middle bottom of the model - as shown

To double-check the size I passed through Sketchfab and it looks good ( position and scale)

When I add it to my project with "webxr scene-view quick-look" it shows the model for a quick sec. With " scene-view" only the model scale is huge.

Code is Here: https://glitch.com/edit/#!/lems-window-test
Live site: https://lems-window-test.glitch.me

Device: Samsung S20/ android 12 / Browser: Chrome 104.0.5112.97

[elalish]

It definitely appears to be too big (wrong units). glTF is always in meters. Not sure why Sketchfab's tool isn't catching it. You can load it in our editor and click "model details" (or warning/error, depending on the validation) to see the bounding box size. I also just fixed a related bug for quantized models, so if it's working in the editor, we'll have a release out with the fix soon.

[rossrossp]

I have this same issue with .glb/.gltf files exported from Blender.
Even if I export a standard 1m cube from Blender it's huge in AR when I deploy it to mobile via the Model Editor.

Here it is shrunk to 50% in AR. The bottom of the guitar is 99cm from the ground for reference:

The editor's validation report for the default Blender cube is as follows:

Format: glTF 2.0
Generator: Khronos glTF Blender I/O v1.6.16
Stats:
1 draw calls
0 animations
0 joints
1 materials
24 vertices
12 triangles
2.00 m x-width
2.00 m y-height
2.00 m z-length

Which, unless I misunderstand, does imply that the model is twice the size it should be.
Hopefully this helps with diagnosing/fixing the issue, or someone can point me to something I'm doing wrong.

[elalish]

It does appear to be a 2m cube; are you sure it's really meant to be a 1m cube and not a cube that goes from -1 to 1? Also, have you moved around in AR enough to actually place the object on the floor? It might just be closer to you than expected.