Select Mesh Faces by Orientation

Replies to This Discussion

Permalink Reply by nikos tzar on September 22, 2014 at 6:06am

this should do it:

Permalink Reply by Prospero on September 22, 2014 at 1:15pm

your definition works well with a primitive mesh, but applying to a set of meshes give me this result

(btw I know it's working on Z axis, it was a mistake.) I want to remove the top and the bottom of the cells

Thank you very much for your help!

Permalink Reply by nikos tzar on September 22, 2014 at 4:51pm

Hello Prospero,

my reply was a bit hasty. Seeing it again I realize it will not work on a mesh with faces semi-oriented towards the Z axis (that is a good reason for uploading your files - I would have tested it and seen it doesn't work).

Anyway, I believe this should work:

just plug your meshes on the mesh container (so that they are grafted).

Attachments:

• remove-mesh-faces.gh, 9 KB

Permalink Reply by Prospero on September 23, 2014 at 9:54am

Wow! thank you very much, works like a charm.

Last thing, what shuld I do if I want to just select those faces for use them and not culling them from my mesh?

again, thanks a lot

Permalink Reply by nikos tzar on September 23, 2014 at 10:43am

This can give you the mesh faces:

or you could right-click/Invert on the [CullF] P input.

Permalink Reply by Keith VanDerSys on September 23, 2014 at 2:38pm

what's plugging into dispatch?

Permalink Reply by nikos tzar on September 23, 2014 at 2:57pm

Into L: the faces of the mesh(es),

into P: a true/false pattern with true if both X and Y vectors of a face are 0.

Permalink Reply by ng5 Alex on September 22, 2014 at 5:15pm

Do your shells have faces that are accurately z oriented? is it always the z ones you want removed?

its difficult to judge from the screenshot. like nikos says uploading makes things a lot easier.

If not perhaps a min max angle deviation from z axis is needed to see which faces are culled or not.

cheers

alex

Permalink Reply by Prospero on September 23, 2014 at 9:52am

thank you but I just need faces perpendicular to XY

Permalink Reply by Muhammad Zharif Rafiq on October 13, 2016 at 6:31pm

Hi guys, 

I'm having a little problem following this technique. I can cull/select the z mesh faces, but it tend to select both x and y faces. I want to select all faces facing x only. 

Thanks in advance. 

Attachments:

• question.PNG, 38 KB
• question2.PNG, 49 KB

Permalink Reply by nikos tzar on October 14, 2016 at 7:12am

Hello Muhammad,

Try the second definition and from [DeVec] component use the Y and Z outputs.

hope this helps,

Nikos

Permalink Reply by Muhammad Zharif Rafiq on October 14, 2016 at 8:04pm

Hi Nikos,

Thanks for the response. I've actually manage to work it out. 

My problem was because the mesh are joined together because i generate the mesh boxes from a cellular level. Using DeVec wont help me cause the Y and Z output kind of messed up somehow.

I use dot product instead and cull it that i found from other discussion.

Aniway,appreciate the response again and here is how i resolve it. 

Cheers.

Attachments:

• question.PNG, 53 KB