houdini: point-num is represent for half-edge(vex)

 point-num is represent for half-edge(vex)

 

 

 

 

　　The environment is houdinifx software.

 

　　Point(point-level) only has 'POSITION' attribute.

 

　　Route:　　vertex　　->　　half-edge　　->　　primitives.

 

　　Vertices are shadow of one point. vertices form half-edge. half-edges form primitives 

 

　　Point-num belongs vertex level.

 

　　Point-num stands for an unique half-edge.

 

　　Half-edge is directed, direction from started vertex to end vertex.

 

　　Half-edge belongs to unique primitive.