Mesh Normals

Replies to This Discussion

Permalink Reply by taz on November 27, 2011 at 12:33pm

Wieland,

uto's Mesh Tools have a [Unify Vertex Normals]...  Mesh faces, by definition, don't have face normals.

Permalink Reply by David Rutten on November 27, 2011 at 12:59pm

Actually mesh faces do have normals. It's a bit ambiguous in case of quads, but Rhino relies on face normals for display purposes. There is a Face Normal component in the standard grasshopper component set, but I haven't made anything that allows you to change face normals.

 

Do note that often face normals are computed by Rhino because they follow from the shape of the mesh, you typically don't manually assign them.

 

--

David Rutten

david@mcneel.com

Poprad, Slovakia

Permalink Reply by Wieland Schmidt on November 27, 2011 at 4:35pm

@ taz

Thank you, I totally forgot about uto's very helpful Mesh Tools...

 

@david

yes, I mainly need to unify the normals for display purposes. If I mirror a mesh I get a strange looking model.. its not dramatic, I can unify the mesh normals in rhino. Would be nice, to do this in grasshopper though.

 

 

Permalink Reply by taz on November 28, 2011 at 3:41pm

I see I stand (partially) corrected.  If you unify the vertex normals that *should* fix the problem when you bake your mesh.

 

 

Permalink Reply by Jeff Niemasz on June 26, 2013 at 2:39pm

Hello David,

Could you elaborate on this- is their a way to access the mesh face normal in a custom vb script (for quads with co-planar vertices and triangles)?

Jeff

Permalink Reply by Jon on July 23, 2014 at 7:14am

use this combination also Change the mesh normals direction!

Permalink Reply by Ralph Zoontjens on June 30, 2017 at 12:41pm

Jon, this is what I am looking for, but, what are the first two components on the left?
I don't recognize them from the icons. If you turn off Draw Icons in Display I find the definition much more legible.

Permalink Reply by Laurent DELRIEU on June 30, 2017 at 12:50pm