Some objects have child objects as well. For example the AlCurve class has AlCurveCV as a child class.

Here we see a curve DAG node, its curve object, and control vertices (CVs). To create this entire structure, first instantiate and create an AlCurve, then instantiate and create an AlCurveNode object. Note that if an AlCurve is created and not associated with an AlCurveNode, it doesn’t become part of the universe. In this case, if the pointer to the AlCurve is lost, the AlCurve becomes wasted memory.

A face is similar to a curve. Here we see a face DAG node, its face objects and their control vertices (CVs). A face must have at least one face object. To create a face, instantiate and create an AlFace then instantiate an AlFaceNode and pass the AlFace to the face node’s create method. As with curves, if the pointer to an AlFace is lost without first being associated with an AlFaceNode, the AlFace becomes wasted memory.