Overlapping IFCSpace in IfcOpenShell

[MahmoudAbdelRahman]

Hi everyone,

Thanks so much for your support, I'm using Python IfcOpenShell and OpenGL to read IFCSpace entities, When I draw the spaces, I get overlapped spaces as shown in the figure, I'm not sure what the problem is ? Is there any key to solving the problem to make spaces similar to those from Revit?

Best regards, Mahmoud

[MahmoudAbdelRahman]

Here is a hint of what I have done:

1. Read the ifcfile and extracted each IFCSpace entity.
2. Got the IFCRectangleProfileDef and read the IFCAxis2Placement2D of the rectangle as well as the width and height and direction.
3. From the previous data, I draw the rectangles and extruded them in OpenGL.

[aothms]

Hi,

Couple of remarks.

There are a lot of different types of representation items, assuming that every space is defined as a IfcRectangleProfileDef is very likely too optimistic.

There are also a lot of placements throughout the file. In particular you do not mention the ObjectPlacement of the IfcSpace. Did you take that into account?

ifcopenshell.geom.create_shape() when passed a product instance (e.g a space) will take care of each of these things. Including an option to triangulate the resulting (3d) geometry to directly visualize in e.g. OpenGL.

Kind regards, Thomas

[MahmoudAbdelRahman]

Hi @aothms, It is great to hear from you, Thanks so much, your answer is very helpful and much appreciated. It is my first time to know about ifcopenshell.geom.cereate_shape(), is there a good documentation on python ifcopenshell I can follow ?

Thanks so much, Best regards, Mahmoud.

[aothms]

@MahmoudAbdelRahman good to hear. A complete reference documentation is being worked on, for the moment the best resource are the tutorials on http://academy.ifcopenshell.org

[MahmoudAbdelRahman]

Thanks so much. Best regards, Mahmoud