Surface normal

[onrender]

Hi,

I found two ways to get the normal vector of a surface. One is working from the sample library however I do not understand the second one from the forum. Clement refers to “Normal.Z” however I cannot find in the Rhino Common docs.

From forum:

Normal vector of plane always same even after rotation

Hi @all, i would like to measure the normal-vector of a plane before and after rotation. I only want those surfaces of a brep, which normal-vector in z-dir is -1 and lie at z=0: for face in brep.Faces: plane_of_face = face.TryGetPlane() if int(plane_of_face[1].Normal[2]) == -1 and plane_of_face[1].OriginZ == 0: brepface_znormal1 = face So my variable “brepface_znormal1” is the one which normal-vector I want to observe after rotation (user rotates and quits with “ESC”). Therefo…

sample: IronPython

Determine Normal Direction of Brep Face

[nathanletwory (Nathan 'jesterKing' Letwory)]

You mean these?

http://developer.rhino3d.com/api/RhinoCommon/html/M_Rhino_Geometry_Surface_TryGetPlane.htm -->

http://developer.rhino3d.com/api/RhinoCommon/html/P_Rhino_Geometry_Plane_Normal.htm

[onrender]

Yess, thank you!

[onrender]

Nathan, can you help me how I can set multiple type of objects in the filter? I would like to select Surface and Brep as well.

gs.GeometryFilter = Rhino.DocObjects.ObjectType.Surface (I put 24 but got syntax error)

[nathanletwory (Nathan 'jesterKing' Letwory)]

You can OR them together like here:

mcneel/rhino-developer-samples/blob/7f26b4d48c0579e97fe5964fe27ebed5168c135a/rhinocommon/snippets/from_rhinocommon/cs/ex_spacemorph.cs#L5

[onrender]

Thank you,

another thing that I already have code to get the surface and I need to reference.
I have found a GetOneObject with Objref. Can I use that class and connect with NormalAt method?