Intersection between edges error when perpendicular and intersecting

[alvpickmans]

When doing edge1.Intersection(edge2) and edge1 is perpendicular to edge2 and intersecting on one of edge1's vertex, returned intersection is that vertex. On this case the dot product is also 0 but they are not parallel.

Graphical/Graphical/src/Geometry/gEdge.cs

Lines 112 to 137 in c51ff69

	// if dot == 0 it means that they are parallels
	if(Threshold(dot, 0))
	{
	//Fully contains the test edge
	if(edge.StartVertex.OnEdge(this) && edge.EndVertex.OnEdge(this))
	{
	return edge;
	}
	else if(this.StartVertex.OnEdge(edge) || this.EndVertex.OnEdge(edge))
	{
	gVertex[] vertices = new gVertex[4]
	{
	this.StartVertex,
	this.EndVertex,
	edge.StartVertex,
	edge.EndVertex
	};
	var sorted = vertices.OrderBy(v => v.Y).ThenBy(v => v.X).ThenBy(v => v.Z).ToList();
	return gEdge.ByStartVertexEndVertex(sorted[1], sorted[2]);
	}
	else
	{
	return null;
	}
	}

Dynamo recreation