Sunday, 12 August 2012

Navisworks planning from Revit

Recently I saw an Autodesk video where people setup section boxes in different views so they could split up their model and this would help them in navisworks for planning. I got curious and gave it a try. I was wondering what would happen with the elements that are cut by the section box. I was hoping that those  elements  would not be exported. If they are exported do you get the whole ore the cut up  elements?

It turns out you get the cut up  elements . Since you can't line up section boxes or snap them to whatever, I can't say I am to happy about that approach.

Since I happen to have the same file they are using in the movie I thought let's have a go at it.

Some people will say use the worksets or use phases. Turn the one on you want and export the view. That could work but for this example I am assuming that the worksets setup or phasing for this project doesn't suite the needs.

I am going to add a project parameter, as an instance, to all relevant objects.
This instance parameter will contain information about to which part of the building it belongs.

First this is the building in masses with some names.
Next you add the project parameter
To make things a bit easier I suggest you create filters first. These filters are going to help you turn building parts on or of.

This is how I have setup the filter for this model.
Make sure you create one good filter and duplicate that one. This filter will look for elements that have 'Base' filled in their 'buildingpart' parameter. The nice thing is that you can turn off all the elements that match the filter with one tick.
I have added overrides to the filter which should make things more visible
Next comes the tricky part and that will take a while to get right. You have to select all the objects and and fill in the parameter. Of course you can do multiple objects at the same time. If there is an analytical model in your file make sure to turn them of first.

If you first add the filters to the view and next you add the parameter values you will see much more clearly what you are doing.

Next let's go to navisworks
Open the selection tree and go to the property tab. Notice that you see the project parameter you have added. To create a flexible planning it's handy to first create searchsets. Unfortunately you can not use the searches in the property tab. You have to select them and next save them in the sets window.

Next you can create a automated planning. See arrow 4.

This methode is not a fast as a using a section box but in the long run this will help you better. 

Other Navisworks blogpost from me

Disclaimer information

Wednesday, 8 August 2012

Revit parts and IFC

How to get Revit parts to IFC

It's important when you export a Revit model to IFC that the following conditions are met:
  • Export with “Current View Only” option
  • Parts must be visible in the view
  • If the "Split Walls and Columns By Level" option is chosen, then wall parts will be assigned to the appropriate level as determined by their spatial position

Be aware:
Parts import / export done for all categories except Roofs
Parts import from IFC : only geometry is imported not the parts information
I have opened a revit file exported to IFC in Navisworks. You see a part from a wall selected and on the right you see the properties. In the IFC material tab you will see the Revit material back asign to the compound wall in Revit. As stated only the geometry is exported to IFC but the wall openings are missing.

If your interested I can share the revit and IFC model with you.


Revit and IFC

A common misconception is that Autodesk wants to undermine IFC. There is a lot of mud throwing between ADSK users and IFC zealots. Looking at the improvements ADSK is making to better support open standards like IFC. I would like to add my bit to the big discussion. (everything written in blue is mine the rest is provided by Autodesk)

This information comes from Autodesk. 

Autodesk Revit 2013 is:
  • IFC v2x3 certification ( re-certified)
  • IFC export Add-In supporting 2x4 standard
  • Increased IFC open source customization : creation of own features possible
  • Local IFC requirements differs
  • Autodesk committed for IFC : full team works on this
  • New element types can now be exported
  • Support for workflows
  • Export as solids : more possibilities
More elements supported for export 

.NET Open Source code released for Quasar 
2D Plan view export no longer offset from 3D Geometry 
Always export True North to IFC 
Beam Length fixed for certain beams on export 
Beams never extruded upwards 
Better Geometry splitting for elements allows for fewer surface models 
Coordination View 2.0 (CV2) improvements 
IFC export has added a number of improvements for Coordination View 2.0. 
"Current View Only" export now works in any model view 
"Current View Only" mode has been fixed and now has extra functionality. 
Doors with nested openings export opening 
Export Assemblies 
Export PSet_BuildingCommon 
Export Filled Regions 
Export Parts 
Export Uniformat information as IfcClassification and fcClassificationReference 
GSA export support 
IFCExportAs shared parameter accepts "IfcWallStandardCase" as valid value 
Internal Revit property set names no longer have "PSet_Revit_" prefix on export 
Light Source no longer exported for lighting fixtures 
MEP Plumbing Fixtures exported as IfcFlowTerminal 
Multi-story stairs have correct properties 
Postal Address is parsed in the Location 
Slab base quantities are only exported for COBIE or QTO 
Split by level option exports geometry below the lowest level 
Unit specification for Mass corrected 

Fix normal of slightly non-planar faces 
Prevent creation of illegal faces in imported geometry 
Space geometry not imported as in-place family solid 
Text Font not always set correctly 

But more important is that Autodesk made an api for ifc so everyone could create their own importer / exporter if needed.

next to that:
BuildingSMART International Industry Foundation Classes (IFC) version 2x3 is now certified for Revit. Revit supports global industry standards including GSA specific classifications and property sets for building management and energy analysis. Open source Revit IFC exporter enables you to submit updates and at any time the exporter can be updated to support emerging standards.  

The BIM Open Source Project now controls the code for the Revit STL and IFC Exporter. You can propose changes to the IFC exporter, fix bugs, or enhance the code base to support regional requirements, allowing you to collaborate more effectively with third-party applications to support design workflows.

Bottom Line:  Industry Foundation Classes (IFC) for Revit provides greater support for industry and government standards.

Conclusion we are not the enemy :)

Wednesday, 1 August 2012



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