Data conversion failed from Goo to Surface

I'm having a problem with pipes created with GhPython.

Here is the code of the problem.

pipes = []

pipe = rs.AddPipe(line, 0, 0.5)
pipes.append(pipe)

I wanted to output this list with pipes to grasshopper.

But the Srf Component says like this.

1. Data conversion failed from Goo to Surface

And Panel Component says like this.

IronPython.Runtime.List...

Normally, I can output lists with points and curves just by using rs.Add~~~

I mean the code below

curves = []

curves.addCurve(curve)

I don't know why Pipe cannot do this though others can do.

Can somebody help me with this problem??

Replies to This Discussion

Permalink Reply by David Rutten on December 25, 2013 at 3:18am

Pipes are probably Breps. If they have more than one face, they can't be converted to a surface. Try using Brep instead of Surface.

David Rutten

david@mcneel.com

Permalink Reply by djordje on December 25, 2013 at 5:13am

Look like this issue emerged before.
It seems some RhinoCommon methods (in this case Rhino.Geometry.Brep.CreatePipe(), which rs.AddPipe() function calls) return a list of lists, which grasshopper does not like. That's the point of: IronPython.Runtime.List.

So you either need to flatten the output (not sure I get this, but looks like it works):

flatten = lambda *n: (e for a in n
for e in (flatten(*a) if isinstance(a, (tuple, list)) else (a,)))
pipes2 = list(flatten(pipes))

or convert it into data tree:

import Rhino.Geometry as rg
from clr import AddReference as addr
addr("Grasshopper")

from System import Object
from Grasshopper import DataTree
from Grasshopper.Kernel.Data import GH_Path

def raggedListToDataTree(raggedList):
    rl = raggedList
    result = DataTree[object]()
    for i in range(len(rl)):
        temp = []
        for j in range(len(rl[i])):
            temp.append(rl[i][j])
        #print i, " - ",temp
        path = GH_Path(i)
        result.AddRange(temp, path)
    return result

pipes = raggedListToDataTree(pipes)