Hi there,
I am new and struggling a bit with GH
My question is, in a mesh of quads
Is there a way to select the faces that are connected to a selected vertex?
That would be extremely useful
Please
Help!
Welcome @bdessi1016,
Absolutely, here’s an example using a custom GHPython component:
Meshes are composed of mainly vertices and faces. The vertices are stored in a list of three-dimensional points, whereas each faces is a collections of vertex indices from the vertex list. Each quad face has for instance four indices, referring to the vertices it is composed of. The face vertices are conventionally ordered in a counter-clockwise manner.
This means that we only have to check which vertex index is included in a face of vertex indices to see, which faces the vertex in question is part of.
The Python script is rather simple:
from ghpythonlib import treehelpers
vertex_findices = [] # nested list of face indices per vertex
for i in xrange(Mesh.Vertices.Count): # loop vertices
indices = [] # face indices for the current vertex
for j in xrange(Mesh.Faces.Count): # loop faces
if i in Mesh.Faces[j]:
# the vertex index is includes in vertex indices of the current face
indices.append(j)
vertex_findices.append(indices)
# Outputs
vIndices = [i for i in xrange(Mesh.Vertices.Count)] # list of vertex indices
fIndices = treehelpers.list_to_tree(vertex_findices) # tree of face indices for each vertex
Please note that if you’re using a Rhino version, older than 6, you need to install GHPython, if you haven’t already.
adjacent_faces.gh (8.8 KB)
I DON’T KNOW HOW TO THANK TO YOU
I took my time to answer because i needed a rest of this after being several days trying
<3
best regards!