Mesh problem

Rhino Rhino for Windows
1

hello all
as shown in below picture, i generated mesh in rhino.
could you please say

  1. how can i have just square mesh? i dont like to have triangular mesh.

  2. i would like part 1 and part 2 be equal size.

Capture5858

SheikhLotWithRINGrealMesh.3dm (514.6 KB)

2

Hello - in the detailed mesh control, make sure ‘Maximum aspect ratio’ is zero and control the mesh size with ‘Maximum edge length’ and ‘Maximum distance edge to surface’, and Jagged Seams set.

image
image591×580 14.9 KB

-Pasca;

1 Like
3

Dear @pascal
thank you so much.
could you please say:

  1. how can i find,there is how many cells on the shape?
  2. i would like to find average size of cells!

best

4

Hello - use PolygonCount for the number of polys - for the size, use Area and then divide by count…

Here is a quick python:

import Rhino
import rhinoscriptsyntax as rs

def test():
    
    id = rs.GetObject("eslect a mesh", filter=32, preselect=True)
    if not id: return
    
    mesh = rs.coercemesh(id)
    count = mesh.Faces.Count
    x = Rhino.Geometry.AreaMassProperties
    area = x.Compute(mesh).Area
    print "Average polygon area in model units is ", round( area/count, 3)
    pass
    
test()

-Pascal

1 Like
5

hello dear @pascal
excuse me, i have another question.
i dont need to generate mesh in the bottom of the shape.
how can i remove that mesh is generated in the bottom of the shape?

best

Capturea2b

6

Hello - ExtractSrf before meshing, or use ExtractMeshPart or Explode after.

1 Like
7

dear @pascal
like as shown in below picture, i don’t know why there isn’t uniform mesh!
mesh of part a and mesh of part b are not equal size.

thanks for everything
Capturea1b

8

Hello - yeah, I guess that is due to the object being an exact revolve weighted points. Try RebuildUV in U with 12 points, then mesh the result.

image
image1014×539 207 KB

-Pascal

1 Like
10

dear @pascal
thank you so mush.
you are best and best.
thanks a million

11

You are welcome, I’m glad it worked out.

-Pascal

1 Like
12

Dear @pascal
i have a question but i’m not sure, ask here or in the grasshopper.
now, i gonna set one brep in grasshopper but grasshopper dont select the shape.

dear @pascal
do you think, mesh in rhino has effect on grasshopper/ladybug result??

1111111111
1111111111728×441 101 KB

13

Hello - the mesh is not a brep - you’ll need a mesh component in GH. ‘brep’ = surface or polysurface, in Rhino.

-Pascal

1 Like
14

hello
dear @pascal
how did you find 12 points in U ?
I have another 3D shape, that attached, i don’t know how many points and in U or V for RebuildUV!!!
best
ahad

yazdDome.3dm (10.6 MB)

15

Hi ahad - I would create a clean new curve for the revolve - as in the attached file - and make the revolve using the ‘Deformable’ option at 12 points - to avoid using RebuildUV at all.

yazdDome_Smooth.3dm (10.4 MB)

-Pascal

1 Like
16

dear @pascal
thank you for reply.

could you please explain step by step, what do you do?
because i have 3 other shapes for generating mesh. and unfortunately i don’t know how do you create clean new curve!!

best

17

Hi ahad - it will be best to familiarize yourself with some of Rhino’s basic tools - curve drawing is key to a lot of operations… In this case, I duplicated the edges of your revolve since there was no profile curve in the file (DupEdge) then Joined the result and ran Rebuild, to 12 points (in this case, quite a lot of points because the profile has some changes in direction that I tried to accommodate but 6 points would be enough to get a more idealized and cleaner shape - I don’t know enough about the goal here to make that decision)

-Pascal

1 Like
18

The PDF linked in this message is a good introduction to NURBS curves so you better understand how they work:

1 Like