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Building IFC to GDB the correct way - questions

  • March 2, 2021
  • 2 replies
  • 56 views
Y

I am working on a pipeline that will take unsanitised Revit and Rhino models to IFC to GDB. The discussion I would like to have is:

  1. I have looked at the older threads about this, and have found some good FME workbenches. the best of the workbenches do have unpredictable problems, for example i got this error "Expression: edgeCurves_[edge].has_value()". I will begin recording the fatal errors here and see if people have ways to address it.
  2. I havent found a way to build a GDB file that retains the layering in the original file. Anyone have done this before? Or is it not possible because of the IFC format?

2 replies

virtualcitymatt
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Can you expand on point 2? By layering do you mean the order in which surfaces are rendered? That will be a real challenge I would think. Or do you just mean the layer names - If so you should be able to set up a dynamic workflow to handle the layer/schema definitions.

 

For point one - FME sometimes has issues reading IFC files - It actually occurs when the CSG Geometries get Evaluated. When reading native Revit files there isn't an issue.

Another issue can occur if using geometry tools which have a low tolerance (E.g., trying to repair some self intersections).

Good luck!

 

Y
  • yks
  • Author
  • 2 replies
  • March 3, 2021

Can you expand on point 2? By layering do you mean the order in which surfaces are rendered? That will be a real challenge I would think. Or do you just mean the layer names - If so you should be able to set up a dynamic workflow to handle the layer/schema definitions.

 

For point one - FME sometimes has issues reading IFC files - It actually occurs when the CSG Geometries get Evaluated. When reading native Revit files there isn't an issue.

Another issue can occur if using geometry tools which have a low tolerance (E.g., trying to repair some self intersections).

Good luck!

 

Hello ! Yes I just mean to:

  1. Retain the layering of the model that is in the original Revit file. This layer should be nested and retain colour / layer names when transferred to GDB.
  2. Also it would also be necessary to find out how to build the layering information from grasshopper + geometry gym, based on existing rhino's layer structure, so that it gets read correctly in FME.

 

For point 1 - would it be possible to filter these elements that cannot be read , or does it get stuck in the reader component?


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