Model bounding sphere wrong after forward axis conversion change

[lilleyse]

Compare "Milk Truck" ( a 1.0 model) and "Draco Compressed Model" (a 2.0 model) in the 3D Models sandcastle. 1.47 vs 1.46

In 1.47 the pivot point is slightly off.

Removing these lines fixes it, but I haven't looked around enough to know why. Similarly placing them above the other axis conversions works. @emackey would you be able to check this out?

if (model._forwardAxis === Axis.Z) {
    // glTF 2.0 has a Z-forward convention that must be adapted here to X-forward.
    BoundingSphere.transformWithoutScale(boundingSphere, Axis.Z_UP_TO_X_UP, boundingSphere);
}

Noticed in #6559

[emackey]

The transform is needed, but was being applied in the wrong order. PR incoming.

[emackey]

This sample file can be used for testing: OffsetCube.zip

It is a cube that is offset from the origin by different amounts on all 3 axes. It won't be shown in the center of the view if you just comment out the Z-forward transform. The transform has to be applied in the correct order to center the cube properly.