VolMesh.cell_edges

#1

The following code raises error:

import compas
from compas.datastructures import VolMesh
filepath = …
volmesh=VolMesh.from_obj(filepath)
print volmesh.cell_edges(0)

Message: ‘VolMesh’ object has no attribute ‘edge’

Traceback:
line 2189, in cell_edges, “C:\Users…\AppData\Roaming\McNeel\Rhinoceros\6.0\Plug-ins\IronPython (814d908a-e25c-493d-97e9-ee3861957f49)\settings\lib\compas\datastructures\volmesh\volmesh.py”

#2

Just ran the volmesh.cell_edges() and seems to be working fine. Maybe check the obj file, and make sure that the objects have sealed faces as cells? It may be that a volmesh wasn’t properly created from it.

#3

Maybe I am constructing my volumetric mesh in a wrong way. As a simple example: I just made a mesh object from lines that form a pyramid in rhino and exported as an obj file, still gives the same error!
It is strange that the volmesh.edges(), volmesh.cells(), and volmesh.faces() all function properly.

#4

It could be possible that some of the faces are not getting created properly (because you converted them to mesh, possibly?). Why are you converting the object into a obj in the first place? All the examples uses Rhino polysurfaces (closed) directly, so that may be the most stable workflow I would recommend…

#5

I want to use the data structure for algebraic formulations using some packages that won’t function with IronPython. That’s why I am exporting the info to an obj file.

How do you make a VolMesh data structure from a poly surface (cell) or poly surfaces (cells)?

#6

current examples of compas_3gs is based on COMPAS version 0.7.1 (ancient! almost a year ago), and the function is here:
compas_rhino.helpers > volmesh_from_polysurfaces

In current version of COMPAS (0.15.4) it seems to have moved here:
/src/compas_rhino/geometry/_constructors/volmesh.py

#7

tried this:

from compas_rhino.geometry._constructors import volmesh
import rhinoscriptsyntax as rs

guids = rs.GetObject(“select a closed polysurface”, filter=rs.filter.polysurface)
volmesh = volmesh.volmesh_from_polysurfaces(VolMesh, guids)

returns:

Message: iteration over non-sequence of type Guid

Traceback:
line 48, in volmesh_from_polysurfaces, “C:\Users\msalma\AppData\Roaming\McNeel\Rhinoceros\6.0\Plug-ins\IronPython (814d908a-e25c-493d-97e9-ee3861957f49)\settings\lib\compas_rhino\geometry_constructors\volmesh.py”

#8

the function volmesh_from_polysurfaces takes a list of guids…

#9

would you mind filing an issue about this?