Select and Delete Mesh Faces

Hi Guys,

Rhino is not so good at selecting mesh faces and i have to select each mesh face by clicking on each of them which is very time consuming.

Any idea how i could use GH to select a whole bunch of mesh face and delete them?

Maybe i could select them by angle (all the ones i want to delete are flat mesh face)

Thanks a lot,

Arthur

Replies to This Discussion

Permalink Reply by Arthur Mamou-Mani on March 5, 2010 at 4:55am

My work colleagues are getting mad hearing me clicking the mouse so much... Please help :S

Permalink Reply by Kaiko Kivi on March 5, 2010 at 5:47am

Suggestion without grasshopper.
You could explode the mesh into separate faces. And then align you view so you can use crossing window (right to left) selection to select a chunk of your row of faces in a single action. Delete them and join the rest of the mesh again.
This could not work because exploding and rejoining the mesh can change face normals, but it looks like it might not be important at this stage.

In grasshopper I think it could be too complicated to explain which faces to select.

Permalink Reply by Arthur Mamou-Mani on March 5, 2010 at 7:29am

Thanks Kaiko,
Unfortunately, when i explode a mesh in separate faces i loose the texture map applied on the whole mesh and when i join again the mesh it doesn't come back so i try to avoid that...

Permalink Reply by William Baldwin on November 14, 2017 at 7:55pm

I know this is very late (7 years!), but Rhino has a paintbrush tool where you can quickly select anything in the brush mark.

Cheers!

Permalink Reply by Joseph Oster on November 14, 2017 at 8:16pm

Yeah, I don't think anyone is still waiting for an answer seven years later, or two years later, or even two months later... What's the point? Esp. when your answer doesn't refer to Grasshopper?

Permalink Reply by Andrei Raducanu on March 28, 2019 at 3:01pm

for someone like me, that searches for the same issue 9 years later.. what's the point of your useless comment..?

Permalink Reply by Philipp on March 5, 2010 at 7:04am

try to find weaverbird plugin for grashopper. It deals with mesh!

Permalink Reply by Arthur Mamou-Mani on March 5, 2010 at 7:27am

Brilliant!very useful tool.
Unfortunately it doesn't deal with mesh selection...

Permalink Reply by David Rutten on March 5, 2010 at 8:52am

I'd also try to solve this without going through grasshopper.

Do I understand correctly you want to delete certain mesh faces from a large mesh?

--
David Rutten
david@mcneel.com
Poprad, Slovakia

Permalink Reply by Arthur Mamou-Mani on March 5, 2010 at 9:02am

Hi David.
Yes you got it right.

I often deal with meshes as they are good for doing topographies (the data received is often contour lines or points in space with which i do a delauney mesh).

The problem comes when i try to split/trim the mesh:
It often divides the mesh into tiny triangles and doesn't always works so i very often have to delete mesh faces individualy which is such a pain.

It d be great if there was on Rhino a Mesh Face selection tool which would allow to simply roll on lots of mesh faces at a time instead of clicking them one by one.

Would you have any idea how i could do it otherwise...?

Many thanks

Permalink Reply by David Rutten on March 5, 2010 at 9:14am

I can't do this in a DotNET plugin, not enough functions have been exposed. However, I might be able to write a function that deletes all the faces from a mesh that are crossed by a curve. Then you could use SketchOnMesh to generate a bunch of curves, and then delete all the faces that have curves through them.

I can't really select mesh faces and have them remain selected outside of a command.

--
David Rutten
david@mcneel.com
Poprad, Slovakia

Permalink Reply by Arthur Mamou-Mani on March 5, 2010 at 9:32am

Thanks David,
Sounds like a diffcult task...
I use the command DeleteMeshFaces and then select the faces to delete.
The clicking is the annoying part, if i could just keep the mouse button pressed and rool on many faces or even use a "lasso" tool for mesh face, it would make me win so much time...