Shaft, lining detail, expansion joint

I’m trying to create a routine to detail the plaster lining, such as moldings and especially the expansion joint, I’ve tried using extrusion, void form, and shaft, but without success. Does anyone know a way to create a routine like this? That identifies the ceiling, and makes an indentation (as in the image), a lowered indentation in the surroundings automatically. Thanks in advance for all your help.

download (3)(1)

Are you wanting to just create a joint between the ceiling and the wall or something different?

Exactly, just that. But nothing I tried worked.

You can get the compound edges of the existing ceiling. Make a polycurve from the horizontal edges. Offset the polycurve inward whatever distance you want the joint to be. Get the ceiling type and level of the existing ceiling and create a duplicate ceiling from the new polycurve and then delete the existing ceiling. There will be a true gap between the ceiling and the wall and not a recessed joint or reveal. So that’s why I asked.

Unfortunately this will not work, I only need to do the indentation, since it cannot be leaked, or the lighting bursts

You’ll need to develop a void family that you can path along the joint locations and then cut the ceiling geometry with. Once you have that family and workflow figured out, you should be able to automate it with Dynamo.

May not be what you are after, but you could have two layers of ceiling. Top layer is full perimeter and bottom layer is inset the distance you want.


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It was my first attempt actually, however it didn’t make the cut. I can’t know why, I thought it would be because it became a family, but if you gave that option, maybe it’s possible. But I still haven’t figured out how.

Yes, great solution!
However, it doesn’t work for me, because I work with virtual reality, and I need a project that is as optimized as possible. So the more faces, and worse areas.

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Make sure the family is set to cut when loaded.

“I couldn’t achieve it with the void family. I’m trying it this way, but I haven’t been successful either. What could I do differently?”
tentative.dyn (31.6 KB)

Uploading: Captura de tela 2023-06-18 122741.png…

Could you help me one more time? Haha… I would like to identify the edges, offset them 5cm inwards and 5cm upwards, close the edges, and make a cut. Is it possible?

I think you would have to do what @Nick_Boyts stated above. You would have to make a geometry from a void family. Keep in mind that each void ceiling cut, would be a unique family. So if you have quite a few cut-outs, it could get very difficult to maintain. The graph attached will give you a Dynamo solid representation of the cut-out. There are two inputs where you specify the width and depth of the cut-out. Maybe this will help give you some ideas.

Add Ceiling Joint.dyn (15.4 KB)

It would only need to be a unique family for each profile of the cut. But if you’re just showing expansion joints then I’d think one profile should be enough.

Oh okay. I have never messed with this sort of stuff, so I could very well be approaching this the wrong way.

@cintiamiranda21 Maybe you should stop taking my advice now. :grinning: