The INode::GetNodeTM() method may be used to get the node transformation matrix. This method returns the world space transformation matrix of the node at the specified time. This matrix contains the node's controller transformation and the parent node's transformation. This matrix does not include the object-offset transformation, or any world space modifier (Space Warp) effects.

The node transformation matrix is inherited:

NodeLocalTM = NodeWorldTM * Inverse(Parent.NodeWorldTM)

There are two methods that a developer may use to set the node transformation matrix.:

virtual void INode::SetNodeTM(TimeValue t, Matrix3& tm)=0;

This sets the node's world space transformation matrix, and will call Control::SetValue() on the transform controller.

virtual void Interface::SetNodeTMRelConstPlane(INode *node, Matrix3& mat)=0;

This sets the node's transform relative to the current construction plane. This may be used during creating so you can set the position of the node in terms of the construction plane and not in world units.