private static void CullHalfOfEdges( ref H3.Cell.Edge[] edges )
{
double thresh = -.01;
Vector3D looking = new Vector3D( 0, 0, -1 );
edges = edges.Where( e => e.Start.Dot( looking ) > thresh || e.End.Dot( looking ) > thresh ).ToArray();
}
private static H3.Cell.Edge[] Cull120Cell( H3.Cell.Edge[] edges )
{
Func<Vector3D, bool> passes = new Func<Vector3D, bool>( v =>
{
//return
// Math.Pow( v.Z, 2 ) < 0.13 &&
// Math.Pow( v.W, 2 ) < 0.13;
return Tolerance.Equal( v.W, 0.0 );
} );
H3.Cell.Edge[] result = edges.Where( e =>
{
Vector3D start = Sterographic.R3toS3( e.Start );
Vector3D end = Sterographic.R3toS3( e.End );
return passes( start ) && passes( end );
} ).ToArray();
// Now cull valence-2 edges.
//result = CullValence2Edges( result );
return result;
}