Method nextEdge

source/MRMesh/MRReducePath.cpp:517–550

}

bool TriangleStripUnfolder::nextEdge( MeshEdgePoint & e2 )
{
    assert( !e2.inVertex() );

    Vector2f o2, d2;
    strip_.getLastEdge( d2, o2 );
    Vector3f v[3];
    const EdgeId pl = mesh_.topology.prev( lastEdge_ );
   // orient e2 to have last edge at left
    if ( pl == e2.e.sym() )
        e2 = e2.sym();
    if ( pl == e2.e )
    {
        mesh_.getLeftTriPoints( e2.e, v[0], v[1], v[2] );
        Vector2f x2 = o2 + unfoldOnPlane( v[2] - v[0], v[1] - v[0], d2 - o2, false );
        strip_.nextEdgeNewLeft( x2 );
        lastEdge_ = pl;
        return true;
    }

    const EdgeId nl = mesh_.topology.next( lastEdge_.sym() ).sym();
   // orient e2 to have last edge at left
    if ( nl == e2.e.sym() )
        e2 = e2.sym();
    if ( nl == e2.e )
    {
        mesh_.getLeftTriPoints( e2.e, v[0], v[1], v[2] );
        Vector2f x2 = o2 + unfoldOnPlane( v[1] - v[2], v[0] - v[2], d2 - o2, false );
        strip_.nextEdgeNewRight( x2 );
        lastEdge_ = nl;
        return true;
    }
    return false;
}

void TriangleStripUnfolder::find( const MeshTriPoint & end, std::function< void(float) > edgeCrossPosition )
{