vrml.vrml97.nodepath

Node-paths for VRML97 incl. transform-matrix calculation

Classes

class _MatrixHolder( object ):

__init__( self , matrix )

class _NodePath( object ):

Path within a VRML97 scenegraph from root to particular node

Adds transformation-matrix calculation functions based on the nodetypes.Transforming node's attributes.

__add__( self , other )

Add parent-matrix pre-caching support to nodepaths

invalidate( self )

Set this path to be invalid (and all children paths)

isTransform( self , item )

Customization Point: determine whether a node is a Transform

iterchildren( self )

Iterate over child paths which are still live

iterdescendents( self )

Iterate over all descendent paths

transformChildren( self , reverse = 0 )

Yield all transforming children

transformMatrix( self , translate = True , scale = True , rotate = True , matrixHolder = False , inverse = False )

Calculate (and cache) a transform matrix for this path

Calculates our transformMatrix from our parent's transform and the set of nodes between our parent and ourself. Normally that should be a *single* node or *none* in most cases.

translate: if true, include translations in the matrix
scale: if true, include scales in the matrix
rotate: if true, include rotations in the matrix

Note: to apply these matrices to a particular coordinate, you would do the following:

p = ones( 4 ) p[:3] = coordinate return dot( p, matrix)

That is, you use the homogenous coordinate, and make it the first item in the dot'ing.

class NodePath( _NodePathNodePath ):

Strong-reference version of VRML97 NodePath

class WeakNodePath( _NodePathWeakNodePath ):

Weak-reference version of VRML97 NodePath