Intersection.MeshPlane and quad face

Rhino Developer
1

Hi, I just noticed that Rhino.Geometry.Intersect.Intersection.MeshPlane doesn’t work with Quad Face…

2

This is my method.
Maybe it help you.

ON_3dPointArray points;
points.Append(StartPt);
points.Append(EndPt);

const ON_MeshTree* mesh_tree = mesh->MeshTree(true);
if (mesh_tree)
{
	ON_SimpleArray<ON_CMX_EVENT> cmx;
	if (mesh_tree->IntersectPolyline(2, points.Array(), cmx))
	{
		flag = true;
		if( cmx.Count() == 1 )
			InterPt_nearestEnd = cmx[0].m_M[0].m_P;
		else if( cmx.Count() > 1 ) 
		{
			InterPt_nearestEnd = cmx[0].m_M[0].m_P;
			double MiniDis = cmx[0].m_M[0].m_P.DistanceTo(EndPt);
			double TestDis;
			for (int i = 1; i < cmx.Count(); i++) 
			{
				TestDis = cmx[i].m_M[0].m_P.DistanceTo(EndPt);
				if( TestDis < MiniDis )
				{
					MiniDis = TestDis;
					InterPt_nearestEnd = cmx[i].m_M[0].m_P;
				}
			}
		}
	}
}
3

Can you post your geometry?

4

Here it is.
MeshPlaneXX - Copy.gh (4.5 KB)

5

How about a 3dm file?

6

MeshPlaneXX.3dm (33.4 KB)

7

I’ve reported this as a bug.

http://mcneel.myjetbrains.com/youtrack/issue/RH-30471