IfcSpace style

CadGiru

Want to have a visual style attached to geometry of an IfcSpace. Typically a color and 40% transparency.
Have been reading this post(Color in IFC), and this post (IFC Colour Elements with IfcStyledItem in MappedRepresentations)
However still a bit confused about how to approach

• Blender material?
• IfcStyledItem
• IfcSurfaceStyle
• IfcPresentationLayerAssignment

How to achieve this in a structured way in Bonsai?
As always any help much appreciated

BimETS

Not sure if this is what you need, but maybe this can help

BimETS

Here’s the test I did

CadGiru

@BimETS thx, looks like what I want, will give it a go

CadGiru

Did a brief test, looks great

However after reloading (opening saved project from disk), I get these ' limit artifacts' .

Must admit I have stretched and moved original geometry. Any way to rebuild?

Any help or guidelines most appreciated

theoryshaw

Don't scale objects in object mode, scale them in edit mode.
I think the latest BB doesn't even allow scaling in object mode.
Also just open/close the ifc, not the blend file.
You can save .ifc/.blend file together but there are often sync problems.

CadGiru

@theoryshaw Have not scaled, but:

• pulled (grab'ed)faces in edit mode
• updated origin to be center of geometry (maybe not for all 4 objects)
• moved objects (after unlinking and 'relinked')
  What I am really trying to test is finding a 'safe' workflow. Especially editing geometry of existing manually modeled IfcSpace objects.

thx in advance for any advice , much appreciated as always

theoryshaw

When you move the origin, via...

Make sure you 'manually save representation'...

This is still a quirk, i think, in BB.

CadGiru

@theoryshaw Thanks a lot 🙏

BimETS

@theoryshaw Is there any way to edit an IfcSpace entity? I’ve run some tests and the only method I’ve found is unlinking the entity and then linking it again after the modification. However, every time I do that, the element moves to 0,0,0 and I have to reposition it back to its original location.
Is there a better workflow to avoid this issue? Any tips would be appreciated!

steverugi

You need to use IFC item mode (not Blender's) and tab it to edit it.

BimETS

Yes, but for some reason that approach doesn’t seem to work with IfcSpace entities

steverugi

please unlock Spatial Decomposition to have that option (also select the space and tab it)

steverugi

question:

is it necessary to have IfcSpace not visible in viewport by default?
I personally find it a bit odd, or maybe there is a good reason for that?

zoomer

I also noticed that when I was wondering where my Spaces are (or why they weren't in the way at that time)
Usually in Blender, I think by default, the "Viewport" filter in Outliner is hidden.

Not 100% sure, but I think I have seen similar behavior when loading Speckle (from IFC ?) projects into Blender. Where some objects were hidden by the "Viewport" Filter instead of the Standard "Eye" Filter.

CadGiru

This has become a great thread, thanks to all.. Shame it is not organized as documentation

theoryshaw

I personally find it a bit odd, or maybe there is a good reason for that?

Am also curious why IfcSpaces are special, and 'Disabled in Viewport'
verses just 'Hide in Viewport'

As such, IfcSpaces can no longer be turned on/off with the drawing's exclude/include filters.
Also, when you duplicate a space, in turns off right way.
...
@Moult, Any objections to to using obj.hide_set(True) instead of obj.hide_viewport = True in this commit?
https://github.com/IfcOpenShell/IfcOpenShell/commit/a11f81f2ceaf776498ef8bd63f0f3f605461c297

BimETS

@CadGiru said:
This has become a great thread, thanks to all.. Shame it is not organized as documentation

My idea is to add it ASAP to: https://wiki.osarch.org/index.php?title=BlenderBIM_Add-on/BonsaiBIM_Features_Guide ... otherwise I’ll forget about it later 😅

CadGiru

👎My problem w wiki is I can not reset my passwd. Hopefully someone w credentials can send me a private message or an e-mail w a new one

falken10vdl

@theoryshaw @Moult maybe if there are good reasons for both options, then that is something to add to the Extras :) https://community.osarch.org/discussion/comment/26969

Cheers!

CadGiru

👎My problem w wiki is I can not reset my passwd. Hopefully someone w credentials can send me a private message or an e-mail w a new one

theoryshaw

I tried option 1, but that didn't work, or i can't find it.
I can't do option 2, as i don't have server or configuration access.
https://chatgpt.com/share/6900b11a-1098-8013-919f-4461ab19765b
@Moult can you help @CadGiru ?

theoryshaw

Since no objections, the following uses hide_set() for IfcSpaces instead of hide_viewport.
https://github.com/IfcOpenShell/IfcOpenShell/commit/96fe9b5398e26f6d53c3e7e0dadd4dfc67acf514

theoryshaw

@Moult I see you reverted this commit. Any particular strong reason why?
From my side, it's a little cumbersome to have to manually turn on/off disable in viewports when you have drawings where you want to show IfcSpaces--that is, the on/off doesn't work with activate drawing.

semhustej

@theoryshaw said:
From my side, it's a little cumbersome to have to manually turn on/off disable in viewports when you have drawings where you want to show IfcSpaces--that is, the on/off doesn't work with activate drawing.

I agree.

semhustej

I discovered a simpler way of enabling Space visibility than fiddling with the Scene Collection. There is an eye button next to Spatial Decomposition panel. This turns global visibility of space objects on/off. It seems to me this solves the issues described in this thread.

theoryshaw

I think not being able to turn on/off IfcSpaces with the drawing's exclude/include filters is still an issue, however.
As i understand it, you have to do this manually with drawings.

semhustej

Oh, I tested just the 3D space behavior, not the drawings.