OpenGLContext.scenegraph.grouping

Common implementation for grouping-type nodes

Functions

_cacheClear( signal , sender , subsignal = None , subvalue = None )

Classes

class ChildrenSensitiveField( MFNode ):

Field sub-class/mix-in for checking children for sensitivity

checkSensitive( self , client , value )

Check value to see if there are any sensor children

fdel( self , client , notify = 1 )

On del, do regular del, then check for sensitivity

fset( self , client , value , notify = 1 )

On set, do regular set, then check for sensitivity

class ChildrenTypedField( ChildrenSensitiveField ):

Field sub-class/mix-in for iterating over children by node-types

byType( self , client , types )

getCache( self , client )

class Grouping( object ):

Light-weight grouping object based on VRML 97 Group Node

Attributes of note within Grouping objects:

children: list of renderable objects with ChildrenSensitiveField implementation that sets the parent to sensitive if there is a PointingSensor child

Note that this is a Mix-in class for Node classes

children

exposedField MFNode children []

sensitive

field SFBool sensitive 0

boundingVolume( self , mode )

Calculate the bounding volume for this node

The bounding volume for a grouping node is the union of it's children's nodes, and is dependent on the children of the node's bounding nodes, as well as the children field of the node.

renderedChildren( self , types = (<class 'vrml.vrml97.nodetypes.Children'>, <class 'vrml.vrml97.nodetypes.Rendering'>) )

List all children which are instances of given types

visible( self , frustum = None , matrix = None , occlusion = 0 , mode = None )

Check whether this grouping node intersects frustum

frustum: the bounding volume frustum with a planes attribute which defines the plane equations for each active clipping plane
matrix: the active OpenGL transformation matrix for this node, used to determine the transforms for the grouping-node's bounding volumes. Is calculated from current OpenGL state if not provided.