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by theoryshaw on 24 May 2020, edited 13 Mar 2022
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The start of a roundtrip test for 'mapped item'
BlenderBIM rocks it out of the gate:)
FreeMVD: Are experiments on how well certain objects roundtrip in/out of various BIM applications. We are always looking for volunteers, from other BIM applications, to add their results to these tests. If you can participate, ping @yorik or @theoryshaw and they can give you Github push privileges.
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by Moult on 24 May 2020
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+1 votes
The primary purpose of mapped geometry was to map to a type object geometry. Therefore, if the authoring tool does not expose the type object, and only lets you edit the instance objects, it is a fail in my book ;)
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by yorik on 24 May 2020
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+2 votes
Mapped representations work between any ifcproducts, not only with a "model" or type. I kind of like that, it's exactly the same concept as blender uses, several objects can share the same mesh data, and there is no "master/instance" concept.
I'll try the files in freecad too, i believe that should work out of the box!
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by tobenz on 15 Dec 2021
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Is there a plan to support mapped representations for instances? As I understand e.g. Archicad has no concept of types... I am a fan of this flexibility of using mapped items in both ways.
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by theoryshaw on 15 Dec 2021
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Might want to +1 this issue, if I'm understanding you correctly.
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by tobenz on 15 Dec 2021
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@theoryshaw said:
Might want to +1 this issue, if I'm understanding you correctly.
I already did. The issue you refer to is about a concept allowing synced groups with individual instance identities. This topic is more about saving storage by replicating the linked geometry concept of blender in the IFC file. That is currently possible for typed geometry but not for instances.
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by Coen on 15 Dec 2021
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So the conclusion of the thread is, The IFC Schema doesn't allow for a "Revit type" like based parameter? Or am I wrong? Or are there workarounds?
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by theoryshaw on 16 Dec 2021, edited 16 Dec 2021
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@Coen said:
So the conclusion of the thread is, The IFC Schema doesn't allow for a "Revit type" like based parameter? Or am I wrong? Or are there workarounds?
Hmm. Not sure I follow you.
For example a Revit wall has a wall thickness, that's a type parameter. Similarly, for wall types, BB has LayerThickness that's applied through the IfcMaterialLayerSet that is also a type parameter.
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Also IfcPropertySets can be applied to BB types, verses just instances.
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Was i misunderstanding your question?
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by Coen on 16 Dec 2021, edited 16 Dec 2021
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@theoryshaw said:
@Coen said:
Was i misunderstanding your question?
No not at all, it's exactly what I meant. However would one use type parameters in custom objects?
For example , how would I parametrize (if that's a word) these trapezoid foundation footings in IFC with custom parameters?
So BlenderBIM can read them again and I don't have to remodel all of them when their dimensions change.
Hope I explained myself well, I think what I mean is called roundtripping?
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by Coen on 16 Dec 2021
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+1 votes
@theoryshaw said:
Something like this?
Exactly what I meant! I feel like such an idiot never using Add Type Instance before. I went to remodel elements all the time.
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by duncan on 17 Dec 2021, edited 17 Dec 2021
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Do we have anyone testing with Tekla, Microstation, Solidworks, Inventor & Infraworks. I have access to a nice catalogue of software and we can work something out so someone with experience can guide me. @yorik @theoryshaw
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by theoryshaw on 18 Dec 2021
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+1 votes
Not that I know of. Would be awesome to have experts in other platforms provide tests as well.
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by Coen on 19 Dec 2021
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@theoryshaw
How did you manage to show the dimension annotaions in Blender when modifying that object? Is that some add-on?
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by theoryshaw on 19 Dec 2021
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+2 votes
Tis native functionality...
Would highly recommend @stephen_l's CAD transform plugin, however, for CAD like measurements and transformations...
https://blender-archipack.gumroad.com/l/nQVcS
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by Coen on 19 Dec 2021
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+2 votes
@theoryshaw said:
Tis native functionality...
And viewport overlay is another discovered Blender functionality for me today.