Hierarchical Models

Vizard 8 » Content Creation » 3D Models » OSG Workflow » Hierarchical Models

8.3.1

Hierarchical Models

Models that you use in Vizard can have a hierarchy of sub-parts that are linked through parent/child type relationships. In these hierarchical relationships, the child object inherits the transforms of the parent.

Link Parent and Child

To create a link between objects in Max first click the link button and then drag a line from the child object to the parent object. In the image below a line is drawn from the teapot (child) to the plane (parent):

After exporting the scene from above, it's hierarchy can be browsed using Inspector. In the following image, notice how each sub-part has both a transform and GEODE associated with it. Transforms are special OSG nodes used to manage the hierarchy and GEODEs hold the underlying geometry.

Translate Sub-Parts in Vizard

To get/set the position of a sub-part use the <node3d>.getTransform command. This returns a linkable object that can be used to control the transform.

model = viz.addChild('hierarchy_model.osgb')

#Get a handle to a linkable object for controlling the teapot transform
teapot = model.getTransform('Teapot001')

#Get the child object's absolute position
abs_pos = teapot.getPosition(viz.ABS_GLOBAL)

#Set the child object's absolute position
teapot.setPosition([x,y,z], viz.ABS_GLOBAL)