Hi all, i am looking for a script (or pointers for creating a script) that will highlight all surfaces in a model with a specific number of sides. any help would be fantastic!

Alec

Hi all, i am looking for a script (or pointers for creating a script) that will highlight all surfaces in a model with a specific number of sides. any help would be fantastic!

Alec

You mean BrepFaces (any N of “sides” i.e. Locus points on the outer loop defining “sides”) or just Surfaces? (sides 3 or 4). Or you just want to find BrepFaces that are in fact Surfaces?

In any case post a demo test case.

thanks Peter. OK, so i have a triangular surface (3 points, 1 single simple surface) that is incredibly small, and a huge number of rectangular surfaces (4 points, 1 single simple surface). i would like to be able to find the tiny triangular surface, without having to go through the painstaking task of selecting each known 4 sided shape and changing its layer in Grasshopper. i know this sounds trivial but i cannon work out he best way of doing it. currently i am doing it by ‘checking’ via area, whether there are in fact and small surfaces, however this does not highlight them in the model, and only alerts me that there is a tiny surface somewhere in the mix… many thanks for you quick reply!

Alec

Hi Alec, below python script selects all surfaces with singularities. Hope it helps:

```
import Rhino
import rhinoscriptsyntax as rs
def find_singularity():
objs=rs.ObjectsByType(8)
has_singularity = []
for obj in objs:
srf=rs.coercesurface(obj)
for n in xrange(4):
if srf.IsSingular(n):
has_singularity.append(obj)
break
if has_singularity:
rs.SelectObjects(has_singularity)
find_singularity()
```

1 Like

Hi,

How’s this:

```
import rhinoscriptsyntax as rs
n = 3
nsided = []
rs.EnableRedraw(False)
for obj in rs.ObjectsByType(8): # 8 == surfaces
edges = rs.DuplicateEdgeCurves(obj)
if len(edges) == n:
nsided.append(obj)
rs.DeleteObjects(edges)
rs.EnableRedraw(True)
rs.SelectObjects(nsided)
```

1 Like

Thank you Raul, this is very useful!