/// <summary>
/// http://www.ambrsoft.com/TrigoCalc/Plan3D/PlaneLineIntersection_.htm
/// https://www.youtube.com/watch?v=WPYTruLFas8
/// </summary>
/// <param name="edge"></param>
/// <param name="planePosition"></param>
/// <returns></returns>
public static MVertex GetIntersection(STLEdge edge, double planePosition)
{
// plane equation = z - D; where D = planePosition
// and the z equation in the parametric form
// z = zp + ct; where c = edge.End.Z - edge.Start.Z and zp = edge.Start.Z
double t = (planePosition - edge.Start.Z) / (edge.End.Z - edge.Start.Z);
return(new MVertex(
edge.Start.X + ((edge.End.X - edge.Start.X) * t),
edge.Start.Y + ((edge.End.Y - edge.Start.Y) * t)
));
}
public static bool CompareEqual(STLEdge e1, STLEdge e2, double tolerance = 0.0001)
{
return(CompareEqual(e1.Start, e2.Start, tolerance) && CompareEqual(e1.End, e2.End, tolerance));
}
public void PrintEdge(string tag, STLEdge edge)
{
Console.WriteLine($"{tag} Edge");
PrintVertex("Start", edge.Start);
PrintVertex("End", edge.End);
}