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KrisM

Revit Export

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Just tried the Revit export (3D objects) and was only partially successful. All the walls, roof, floors, etc came into Revit except the walls which had an opening. The doors and windows came into Revit but the containing walls were missing,

Any one have any luck with this export?

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I tried this too last evening.

 

So you say the exported geometry contains some further information ?

(Walls, Windows, ...)

I have no Revit so I re-imported the RVT back into VW and Bricscad,

where I only saw dumb Meshes (?)

No Layers, Materials, ....

 

But I first have to look a little closer later.

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You can download a trial of Revit and use it in viewer mode, it will keep working as viewer after the trial expires. That way you can view Revit files when being offline.


Alternatively you can use the Autodeks online viewer which can be used to view Revit files and other Autodesk products files

https://viewer.autodesk.com/

 

For DWG/DWF files there are also installable viewer programs for free but these are Windows only as far as I know.

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Hello Art V,

 

I see both would need giving Autodesk may data or at least an eMail address 😉 

 

Generally I wasn't very interested in or pleased by the quality of VW RVT importer

in the past. Looks like there weren't any improvements for RVT import for VW 2021.

But as there came an RVT importer to VW 2021, I looked at RVT again as a potential

future option for VW/Bricscad exchange.

 

But for now the VW RVT out > VW RVT in seems much more lossy that DWG out/in.

 

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The RVT import/export is developed by ODA which both VW and Briscad are using, so  in theory they should be the same for VW and BricsCAD unless the RVT libraries and functionality were implemented differently.

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1 hour ago, Art V said:

so  in theory they should be the same for VW and BricsCAD unless the RVT libraries and functionality were implemented differently.

 

🙂

 

That is what I expected too.

Currently RVT Import is totally exciting for me.

I play with old Revit customer's Files and Autodesk Demo Files and am

in contact with BC support.

I see things in Bricscad's imports that I have never seen before in VW

imports and vice versa.

(bunch of 3D HAVC Pipes vs 2D Plan Drawings with exploded line styles)

 

Both importers based on ODA but do exactly the opposite.

(And there is no winner)

- bring in in scale or arbitrary

- bring in Materials or not

- bring in perfect geometry or faulty

- bring in BIM PIO or just Solids

- Solids or Meshes

 

 

And I still don't get how Revit works.

With Solids (?) or just 3D Faces and just able to define ACIS Solids when

exporting by DWG (?) or nothing at all ...

Edited by zoomer

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17 minutes ago, zoomer said:

I see things in Bricscad's imports that I have never seen before in VW

imports and vice versa.

 

It could be that the differences are due to different requirements/possibiliteis in translation into native objects so some things may translate better into native geometry in VW than in BC and v.v. but ymmv as they say. (Now  I'd better quit before the number of acronyms becomes too high)

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For me that shows that there is still o lot room for improvements

with usage of ODA libraries.

 

Also with DWG.

If only VW would send as much Info out as their nearly lossless

import.

 

Maybe we finally, beside misused open IFC format,

meant for just referencing stuff from others together,

need an open source real exchange format for CAD.

The same way it already starts to happen for 3D Appswith

Pixar's open format.

Stil WIP but very promising.

Everyone can work with the Software he/she feels most comfortable

while all can collaborate.

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1 minute ago, zoomer said:

Also with DWG.

If only VW would send as much Info out as their nearly lossless

import.

 

Maybe we finally, beside misused open IFC format,

meant for just referencing stuff from others together,

need an open source real exchange format for CAD.

 

Maybe VW should adopt DWG as its native format? 😱

 

When looking at how much BricsCAD can stuff into the DWG format while keeping most of it as native DWG objects that can be viewed and often edited in other DWG based programs it may not be such a strange idea after all. Though depending on the other program some information may get lost in the process if the other program does not support certain features. So a common file format as you mentioned might solve that issue, or not depending to which extent that file format's possibilities are supported.

 

My pet peeve with VW-DWG is the lack of support for importing/exporting text styles. Yes AutoCAD's text styles are simpler than what can be done in VW but still I'd rather be able to import/export the basics (font, style (bold/italic/bolditalic), font size and stylename) for roundtripping without losing too much than not have it at all and make VW useless for certain types of work. The rest is relatively minor stuff compared to this.

Of course 3D parametrics and constraints as well as assemblies would be really nice to have, then I might not need BricsCAD for the mechanical stuff if the rest of the DWG compatibility stuff would be solved, which is why I still think VW missed opportunities to gain more users from the DWG world.

 

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3 minutes ago, Art V said:

Maybe VW should adopt DWG as its native format?

 

That would save us from converting/migrating our projects every year.

(Just every 3-4 years ?)

 

From my Microstation (to DWG) experience, I don't mind if an App uses a proprietary

file format that fits the Software best. As long as it can export to other File Formats

nearly lossless.

Just because DWG still may lead the market, it may not be the ultimate format and

it is not open. ODA mostly reengineering a proprietary mess.

That only seems to works as Autodesk seems to have already abandoned DWG.

 

Now it is the same story with RVT.

 

 

If there would be a consortium for an open format like IFC I am sure Autodesk would

jump on that train to just keep control.

But there is even no attempt to bring a lossless conversion between Nemetschek

products. All are afraid to lose something when giving up proprietary formats and

control/security by obscurity + just old legacy stuff and limits

 

I think if FreeCAD would act like Blender lately and focus on GUI/UX and usability it

would get the same attention and it would mix up CAD Software.

 

 

TL;DR;

I still don't get the discrepancy between VW DWG imports and exports or the

their satisfaction with the state of Revit "Exchange"

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