Node changes bits definition.

File      : API\scene\zmSceneTypes.h
Namespace : scene

When you modify the node, or it's internal structure (e.g. when editing a geometry of mesh node), when you highlight or select the node or it's elements, node becomes changed from it's previouse state. To reflect these changes, you have to invoke method INode::changed and specify bitwise-or combination of flags which indicates node changes. Bit values and their description follows.

#define NC_GEOMETRY               0x00000001
#define NC_VISUAL                 0x00000002
#define NC_CHILD                  0x00000004
#define NC_TRANSFORM              0x00000008
Values
NC_GEOMETRY
Internal geometry has changed. Node's visual buffers are get updated, so node could be rendered correctly.
NC_VISUAL
Visual aspect of node has changed (e.g. some elements become highlighted, selected, disabled, etc.) In such a case, node routines will update buffers for all node states (highlighted elemects, selected, normals, etc.) but will not rebuild vertex buffer (IDirect3DVertexBuffer9) itself.
NC_CHILD
One or more children nodes has changed.
NC_TRANSFORM
Node's transformation has changed.

Values of NC_CHILD and NC_TRANSFORM are significant for ISkeletonNode, IBoneNode and ILightNode. For the rest of nodes (splines, mesh nodes) NC_GEOMETRY and NC_VISUAL are the most significant bits. Make sure to notify each node you change, so it can get updated correctly.

See Also:
overview of namespace scene
INode::changed method