How to add a IfcVoidingFeature (Add Void)

RaphaëlVouillozRaphaëlVouilloz
in General

Hello,
When using the "Add Void" tool, if I change the class in the menu below:

The menu updates to that:

which looks like a bug
Then, I cannot change the class of the IfcOpeningElement to IfcVoidingFeature:

Any workaround?
Thanks

Comments

  • steverugisteverugi

    @RaphaëlVouilloz

    please try

    Method 1

    1. place your 3D cursor where you want the void to be applied
    2. from the menu "Add" select
      • Definition: IfcFeatureElement
      • Class: IfcOpeningElement
      • PredefinedType: Opening
      • Featured Object: the object to apply a void
      • Representation: chose what you prefer
      • Edit the geometry making the void with 2xTab
      • Contexts: leave it as is
    3. Alt-O to exit

    OR..

    1. select wall (if the case)or Multi Object Tool from left (T) menu
    2. place the 3D cursor where needed
    3. use Shift+O to create a void
    4. edit the void
    5. Alt+O

    I personally find the first method useful when I want to use an existing object to make a void
    maybe there are other ways?
    cheers

    MassimoemiliotassoRaphaëlVouillozzoomerMaswalpa
  • RaphaëlVouillozRaphaëlVouilloz

    Thanks @steverugi !
    I was not aware of method 1, which works smoothly

    steverugi
  • JulianJulian

    Noob question, how do I resize the 3rd dimension? If I'm understanding correctly these are an extruded polygon? The above shows me how to adjust the size of the polygon (X & Z in the 2nd vid), how do I adjust the extruded distance in the Y direction?

  • theoryshawtheoryshaw

    like this: https://community.osarch.org/uploads/editor/ub/hmws550b31ax.mp4

  • FranSeoaneFranSeoane

    Is there a way to associate/join a single opening "IfcOpeningElement" to a window or door?
    I usually create the single IfcOpeningElement on the wall, and then add or move the single window or door.
    I don't know if there's a way to associate/join IfcOpeningElement + IfcWindowType so that when I insert the window into a wall, the opening and the window are created simultaneously, just like when using parametric windows/doors.
    Thanks!

  • JulianJulian
    edited November 2025

    @theoryshaw
    Thank you, I was searching everywhere in wall tool, I didn't know I needed to switch to multi object tool and IFC Item Mode.
    I've been wondering how to create tapered openings too like those in @FranSeone's screenshot, that's explained now as well.
    Cheers
    julian

  • theoryshawtheoryshaw
    edited November 2025

    Is there a way to associate/join a single opening "IfcOpeningElement" to a window or door?

    I'm not sure how to do it after the fact, but I usually start with creating a tessellated window in the type launcher, and then it has the associated opening.
    If you already created a window without the opening and later want to add one, I do the the following workflow. That is, create a new window via the launcher and then 'join' the geometry of the window you'd like to have an opening.

  • FranSeoaneFranSeoane

    @theoryshaw Thanks!

    If you already created a window without the opening and later want to add one, I do the the following workflow. That is, create a new window via the launcher and then 'join' the geometry of the window you'd like to have an opening.

    It is not necessary to start from a parametric window.
    You can start by modeling a .blend window, and the moment you assign the IfcWindowType, an IfcOpeningElement associated with the type is automatically created.
    The problem is that the created Opening is generated from a "Custom Extruded Solid", which means we cannot generate a unique Opening like a conical trunk or similar.
    The solution would be to be able to choose, to generate that opening, between a "Custom Tessellation" or a "Tessellation from Object".
    I suppose this isn't yet possible in Bonsai.

  • RaphaëlVouillozRaphaëlVouilloz
    edited November 2025

    @FranSeoane said:
    @theoryshaw Thanks!

    If you already created a window without the opening and later want to add one, I do the the following workflow. That is, create a new window via the launcher and then 'join' the geometry of the window you'd like to have an opening.

    It is not necessary to start from a parametric window.
    You can start by modeling a .blend window, and the moment you assign the IfcWindowType, an IfcOpeningElement associated with the type is automatically created.
    The problem is that the created Opening is generated from a "Custom Extruded Solid", which means we cannot generate a unique Opening like a conical trunk or similar.
    The solution would be to be able to choose, to generate that opening, between a "Custom Tessellation" or a "Tessellation from Object".
    I suppose this isn't yet possible in Bonsai.

    A Custom Extruded Solid isn't necessary "box-shaped". You can can achieve more advanced shapes by editing the profile, adding volumes, or cutting them by half spaces:

  • RaphaëlVouillozRaphaëlVouilloz

    A Custom Extruded Solid isn't necessary "box-shaped". You can can achieve advanced shapes by editing the profile, adding volumes, or cutting them by half spaces.

    John
  • FranSeoaneFranSeoane

    @RaphaëlVouilloz said:
    A Custom Extruded Solid isn't necessary "box-shaped". You can can achieve advanced shapes by editing the profile, adding volumes, or cutting them by half spaces.

    I wasn't aware of this option for modeling the Opening with IfcHalfSpaceSolid.
    Great, it's another valid method until we have the option to select: "Custom Tessellation" or a "Tessellation from Object".
    Thanks!

    RaphaëlVouilloz
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