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swept blend with common edge

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Nachricht 1 von 5
Anonymous
350 Aufrufe, 4 Antworten

swept blend with common edge

hi,

 

i'm trying to make a vault model, but the groin vault is not sattisfieing. i need to make the vault as it has been constructed. i need to substract from all 4 sides a 'zeppelin' shape, wich is defined by two different partial ellipses, along a quarter ellips path. aint no thing, as long as the two profiles are not touching. but this is exactly what needs to be done. how can i achieve this? i tried in a massing environment, but i am not able to create a form with those same profilesthe actual vaultthe actual vaultthe sketchingthe sketchingprofiles not touching=okprofiles not touching=okScreen Shot 2019-04-26 at 10.58.52.pngresult when revolving the profile around the edge of the massresult when revolving the profile around the edge of the massparametric groin vault (width, lenght, height, offset) working fine!parametric groin vault (width, lenght, height, offset) working fine!

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Nachricht 2 von 5
FAIR59
als Antwort auf: Anonymous

For your problem, a 3D shape involving 3 different ellipses, there is no solution with touching edges.

You can fill the remainder with a "flat void", of limited dimension, to get a fairly good approximation. (blue in picture)

 

vault00.PNG

Nachricht 3 von 5
Anonymous
als Antwort auf: FAIR59

hi,

 

i guess i figured that one, but this is not satisfiing.

i mean, opening up revit you see this blob architecture thing, but creating a pure geometric form is not possible?

 

i've been thinking of using your answer, but putting the resolve path just outside of the volume...

still, it is a bit ridiculous creating this classic shape is not possible....

 

but thank you for reading and thinking on my issue.

 

J

Nachricht 4 von 5
Anonymous
als Antwort auf: FAIR59

@FAIR59 ,

 

thnx for having a look at this. after looking at your component, i am wondering why you make the void shape by massing, and not with swept blend, as this seems to be much easier to add parametric control. grtz jan

Nachricht 5 von 5
FAIR59
als Antwort auf: Anonymous

I don't think a swept blend will work. 

With swept blend:

  • profiles perpendicular to path
  • lineair interpolation between the end-profiles

For an elliptic "inner"path, the "outer"path won't be an ellips. see picture. (orange line is halfway.)

ellips00.PNG

So you have to use the massing environment.

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