improper display of objects containing group dependencies in Android AR

Hi Verge3D,

this will be a bit longer as I will try to describe error in detail.

When working with 3D models in Blender, we found out that having parent dependencies is causing improper object placement in Android AR.

This scene in Blender (exported via verge3D export to gltf):
[image:blender-error.JPG]

Is properly displayed in viewer (looks like Blender scene).

But (only) in Android AR, after placement, is such that part of object is improperly transformed:
[image:bad-ar.png]

Please notice that this “head object” which is improperly placed is exactly this object with child dependency in Blender scene.

When we apply following “fix” select child object – object->parent->Clear and keep transformation:
[image:fixing.png]

After export, problem is suddenly solved:
[good-ar.jpg]

Being able to hotfix is nice but our graphics would like to keep dependencies as this helps them work with scenes properly.

This applies to all Verge3D versions as far as I know.

—
We are using following code in visual_logic.js inspired by your AR example (object_group is group of objects from Blender)

registerOnClick(['GROUP', 'indicator_group'], function() {
  changeVis(['GROUP', 'object_group'], true);
  setObjTransform(['GROUP', 'object_group'], 'position', arHitPoint('x'), arHitPoint('y'), arHitPoint('z'), false);
  setObjDirection(['GROUP', 'object_group'], getObjTransform('Camera', 'position', 'x'), getObjTransform('Camera', 'position', 'y'), getObjTransform('Camera', 'position', 'z'), true);

}, function() {});

which is calling your function function setObjDirection(objNames, x, y, z, lockUp) for AR objects initial positioning.

Solution:

I think this could be fixed by following:
– our graphics team constantly removing all parent dependencies before export (manual time consuming, undesirable, human error)
– modification of your python export Blender script Verge3D GLTF for automatic removal of such parent dependencies
– improving mentioned javascript function for proper initial object placement in Android AR scene

Please let me know if you needed anything else.

Thank you very much in advance for your support!

Petr Sehnal, Precismo