Blend4Web Scene Designer: positioning and linking objects in the scene
Now with Blend4Web Studio even a kid can assemble a 3d scene. Any user can select a wheel on the storefront and place it in the car 3d scene.
A 3d artist should mark bones of axis and a wheel with a positioning sign and a tag to simplify the search of corresponding items. Thus users can add into their scenes ready-made objects and position them in the appropriate place by default.