Cutting Walls with roof slabs

B by bdamay on 14 Feb 2024, edited 15 Feb 2024 #

Hi everyone,

I got confused by the way Shift E is acting between walls an slab. It seems that shift E creates a "dynamic" boolean operator on the wall (see img below). That's fine until it seems only one boolean (HalfSpaceSolid ?) can work at a time.

I found a workaround by setting the boolean to "manual" and repeat the shift E afterwards and resetting to manual. Seems to work fine.

But i'm wondering if this is right to do so , is it ?

or is there something else i should understand better ?

Thanks

T by theoryshaw on 14 Feb 2024 # +3 votes

Currently not possible to 'extend' one wall to multiple roofs...

https://github.com/IfcOpenShell/IfcOpenShell/issues/3081

As a work around, i do a void like that...

B by bdamay on 14 Feb 2024, edited 14 Feb 2024 #

Hi @theoryshaw thanks for your reply. I understand that what i do with turning my booleans to "manual" is not the right way is it? I'm finally able to have my two cuts quite neat that way, i don't understand why would that be wrong (see below what shows when i turn boolean to visible) ? I may miss something...

I also havn't completely understood how i could duplicate my slabs into voids and find it a bit tedious to redraw a void the exact same shape of my roof.

Thanks again

B by bdamay on 14 Feb 2024, edited 14 Feb 2024 #

Here's an update of my gif. The one before was not that clear i think . It seems that setting the boolean created by shift E as "manual" has made it permanent in some way... i can then redo another one. Why would this be wrong ?

S by steverugi on 14 Feb 2024 # +1 votes

@bdamay said:

Here's an update of my gif. The one before was not that clear i think . It seems that setting the boolean created by shift E as "manual" has made it permanent in some way... i can then redo another one. Why would this be wrong ?

interesting solution

I would normally split the wall into 2 and extend them against each roof slope

T by theoryshaw on 14 Feb 2024 #

For me, i've found HalfSpaceSolid booleans a little buggy, especially when you miter/butt walls at corners, so i don't use them that much.

B by bdamay on 14 Feb 2024, edited 14 Feb 2024 #

@theoryshaw said:

For me, i've found HalfSpaceSolid booleans a little buggy, especially when you miter/butt walls at corners, so i don't use them that much.

Yes i noticed something like that as well. Need to mitre before applying boolean. Or the other way around, i don't know... i'll look into this.

@steverugi said:

interesting solution

I would normally split the wall into 2 and extend them against each roof slope

Splitting walls make some additionnal lines in the plan , isn't it? How do you get rid of these ?

S by steverugi on 14 Feb 2024 # +1 votes

@steverugi said:

interesting solution

I would normally split the wall into 2 and extend them against each roof slope

Splitting walls make some additional lines in the plan , isn't it? How do you get rid of these ?

I use BBIM for converting 2D DWG into models to extract quantities, I haven't used it for professional printouts yet, only played a little with it

I thought wall seams when printing was sorted out by now?

T by theoryshaw on 15 Feb 2024 # +1 votes

I thought wall seams when printing was sorted out by now?

they 'meld' in plan, but not in elevation.

https://github.com/IfcOpenShell/IfcOpenShell/issues/3742

S by steverugi on 15 Feb 2024 #

thanks @theoryshaw

I thought wall seams when printing was sorted out by now?

they 'meld' in plan, but not in elevation.

https://github.com/IfcOpenShell/IfcOpenShell/issues/3742

I am yet to adventure in the printout territory, however on top of walls I also use an IfcCovering layer of 2cm for outside plastering, which is kind of tedious due to openings.

Not sure if it's the right way of doing it, but atm I clad the whole lot mainly because I don't know how to deal with layer set in columns, slabs, and beams, where I don't have the the wall plaster skin to cover (If I were to use layer set in walls to include plaster)

As soon I as get enough proficient with the quantity thing I am going to move to documentation :)

B by bdamay on 15 Feb 2024, edited 15 Feb 2024 # +1 votes

@theoryshaw said:

they 'meld' in plan, but not in elevation.

https://github.com/IfcOpenShell/IfcOpenShell/issues/3742

Thank you for this information.

Well even if it was melted, (with all respect to @steverugi) i think i prefer not to split walls that i consider being one wall. I guess i need to try the void way you mentionned earlier.

Is it possible to duplicate an element as a void instead of having the void cube that you need to redraw? (I think i saw something like this somewhere but i can't recall where i might have dreamt it)

That said, even if buggy, i kind of like the HalfSpaceBoolean approach as it seems to be the way i think about it "The wall geometry is cut by the roof and above". I think, from a user point of view in an ideal world, one shouldn't have to create additionnal geometrys to deal with this.

Have a good day

B by bdamay on 15 Feb 2024 #

@steverugi said:

I am yet to adventure in the printout territory, however on top of walls I also use an IfcCovering layer of 2cm for outside plastering, which is kind of tedious due to openings.

Can you not use one opening (void) for multiple elements ?

I may be off of your topic about what you say about coverings but, i tried and it didn't quite work. I apparently can't select more then one element to apply th void on.

B by bdamay on 15 Feb 2024 #

@steverugi said:

As soon I as get enough proficient with the quantity thing I am going to move to documentation :)

Are you talking about writing some documentation ? on the wiki or blenderbim.org documentation ? (or may be it's simply IfcDocumentation :-))

If i were may be a bit more experienced with BlenderBim, i surely would like to give writing doc a try (on matters like cutting walls for example). I understand a lot of material is inside the forum, some in the live chat, it is sometimes a bit hard to find.

S by steverugi on 15 Feb 2024 #

@bdamay said:

@steverugi said:

I am yet to adventure in the printout territory, however on top of walls I also use an IfcCovering layer of 2cm for outside plastering, which is kind of tedious due to openings.

Can you not use one opening (void) for multiple elements ?

I may be off of your topic about what you say about coverings but, i tried and it didn't quite work. I apparently can't select more then one element to apply th void on.

no, I don't thing it's possible

say you have a wall with some covering/plaster, to the best of my knowledge you have to repeat the void (window/door is automatic but can't apply to covering altogether), but I might have missed something..

S by steverugi on 15 Feb 2024 # +1 votes

@bdamay said:

@steverugi said:

As soon I as get enough proficient with the quantity thing I am going to move to documentation :)

Are you talking about writing some documentation ? on the wiki or blenderbim.org documentation ? (or may be it's simply IfcDocumentation :-))

If i were may be a bit more experienced with BlenderBim, i surely would like to give writing doc a try (on matters like cutting walls for example). I understand a lot of material is inside the forum, some in the live chat, it is sometimes a bit hard to find.

I meant documentation as in drawing printouts but I would love to contribute to the Wiki one day

T by theoryshaw on 15 Feb 2024 # +3 votes

say you have a wall with some covering/plaster, to the best of my knowledge you have to repeat the void (window/door is automatic but can't apply to covering altogether), but I might have missed something..

There's (2) different ways. :)

T by theoryshaw on 15 Feb 2024 #

FYI, I made a mistake in that video, don't have the window, 'inside' the aggregate.

S by steverugi on 15 Feb 2024 # +4 votes

@theoryshaw said:

say you have a wall with some covering/plaster, to the best of my knowledge you have to repeat the void (window/door is automatic but can't apply to covering altogether), but I might have missed something..