Creating Roof Geometry using ifcopenshell/blenderbim

V by Vasile_Corjan on 21 Mar 2023, edited 23 Mar 2023 #

Hello everyone!!

I am trying to create a simple hipped roof geometry to an ifc project. I am trying to use the blenderbim function "blenderbim.bim.module.model.roof.GenerateHippedRoof()" and unfortunately i can not figure out what is passed to "obj" argument.

Thank you in advance!

T by theoryshaw on 21 Mar 2023 # +2 votes

select the plane beforehand, i believe.

T by theoryshaw on 21 Mar 2023 # +2 votes

you can do it this way too:

N by Nigel on 22 Mar 2023 #

@theoryshaw are you may be able to help me too please :)

using Blender 3.4.1 BBim 0.0.230304 Win10

all I create is the following...

Python: Traceback (most recent call last):

File "C:\Users***\AppData\Roaming\Blender Foundation\Blender\3.4\scripts\addons\blenderbim\tool\ifc.py", line 126, in execute

IfcStore.execute_ifc_operator(self, context)

File "C:\Users***\AppData\Roaming\Blender Foundation\Blender\3.4\scripts\addons\blenderbim\bim\ifc.py", line 427, in execute_ifc_operator

result = getattr(operator, "_execute")(context)

File "C:\Users\nigel\AppData\Roaming\Blender Foundation\Blender\3.4\scripts\addons\blenderbim\bim\module\model\roof.py", line 46, in _execute

shapely.LineString([obj.data.vertices[edge.vertices[0]].co, obj.data.vertices[edge.vertices[1]].co])

AttributeError: module 'shapely' has no attribute 'LineString'

M by Massimo on 22 Mar 2023 # +1 votes

@Nigel i think that problem is caused by non updated version of shapely module.

You could update manually to the shapely last version (2.something) or you could try with a fresh bbim installation, that, in theory, is shipped with the last version of shapely

V by Vasile_Corjan on 23 Mar 2023 # -1 votes

@theoryshaw that can be a solution, but I am trying to create a roof geometry with the code.

I have this IFC file with four walls and I want to create a hipped roof from the wall boundary. With the new version of blenderbim, there is the GenerateHippedRoof(obj, mode, height, angle) function. I am struggling to create mesh plane out of the wall boundaries to feed into the obj argument.

The point where I got stuck is:

import ifcopenshell

import blenderbim

import bpy

objs = bpy.context.visible_objects[:-3]

boundary_lines = []

for obj in objs:

        boundary_lines.append[obj.data.edges]

Another method I am trying to get to the final result is through: wall.Representation.Representations.Items - which outputs the IfcPolyline. And I am stuck again at the point where all these polylines have to be connected into a polygon -> plane -> mesh plane and at the end the roof.

Can you hint the next steps I have to take, or some required methods/functions to use in the code?

Thank you in advance!!!

T by theoryshaw on 23 Mar 2023, edited 23 Mar 2023 #

I'm a novice too, but does this help you get started?

Would imagine you could get the 'verts' from decomposing the Plan/Axis/GRAPH VIEW/Curve2D line representation of a wall type instance.

then use the verts to create the plane mesh, then feed that into obj attribute of GenerateHippedRoof method.

T by theoryshaw on 23 Mar 2023 # +1 votes

we're screwed! ;)