OpenGLContext.shadow.edgeset

Class encapsulating the set of edges within an IndexedFaceSet

Classes

class EdgeSet( object ):

Set of edges for calculating ShadowVolume

Attributes: points -- pointer to triangle vertex array normals -- pointer to per-triangle normals singleEdges -- set of edges with only a single face attached, Nx2x3 set of edge-points singleVectors -- planar equations of faces where only a single face is attached to an edge singleIndices -- triangle indices for single-faced edges doubleEdges -- set of edges with only two faces attached, Nx2x3 set of edge-points doubleVectors -- planar equations of faces where two faces are attached to the edge doubleEdges -- triangle indices for double-faced edges planeEquations -- set of all planeEquations shadowvolumes -- cache of Light:ShadowVolume mappings

__init__( self , points , normals = None , ccw = 1 )

Initialize the EdgeSet

points: n*3 array of points, n%3 == 0, where each set of three points defines a single triangle in ccw winding
normals: optional array of per-triangle normals, will be calculated if necessary
ccw: boolean indicating whether counter-clock-wise winding is to be used (normal OpenGL/VRML winding) if false, then use clockwise winding (Note that this has never been tested, as I don't have any cw geometry around to test with, and haven't felt energetic enough to work around the standard tools to make any)

calculateLightVector( self , lightPath , currentPath )

Get the source vector for the given light path

Projects the light position into the local coordinate space of the currentPath and then sets up the w component to reflect the light-type 0.0, for directional lights 1.0, for positional lights

points_to_edges( self )

Take an (x,y,z)*3 point array and calculate edge-connectivity information

volume( self , lightPath , currentPath , cache = 1 )

Build/get a shadow volume for this edge-set and this light

Functions

Classes