Generated from: MR::MeshTriPoint
encodes a point inside a triangular mesh face using barycentric coordinates
\\ingroup MeshGroup
\\details Notations used below: \\n
v0 - the value in org( e ) \\n
v1 - the value in dest( e ) \\n
v2 - the value in dest( next( e ) )
barycentric coordinates
\\details a in [0,1], a=0 => point is on next( e ) edge, a=1 => point is in dest( e )
b in [0,1], b=0 => point is on e edge, b=1 => point is in dest( next( e ) )
a+b in [0,1], a+b=0 => point is in org( e ), a+b=1 => point is on prev( e.sym() ) edge