gets the value of the previous edge adjacent clockwise to this one within the triangle . concode_field_sep HalfEdge next concode_elem_sep Face face concode_elem_sep Vertex vertex concode_elem_sep HalfEdge prev concode_elem_sep HalfEdge opposite concode_field_sep Vertex head concode_elem_sep double lengthSquared concode_elem_sep Vertex tail concode_elem_sep void setOpposite concode_elem_sep double length concode_elem_sep void setNext concode_elem_sep String getVertexString concode_elem_sep HalfEdge getOpposite concode_elem_sep HalfEdge getNext concode_elem_sep void setPrev concode_elem_sep Face getFace concode_elem_sep Face oppositeFace
HalfEdge function ( ) { return prev ; }