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Can't keep elements joined.

10 ANTWORTEN 10
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Nachricht 1 von 11
nicebikemate
1307 Aufrufe, 10 Antworten

Can't keep elements joined.

Hi

 

I'm trying to model a complex form, essentially a loft of different rib profiles that are all parallel to each other. This form is a void formed within a big lump of concrete and the profile has to be pretty precise. See below.

 

My feeling is that Revit is struggling with the transition between the arc profile at the end and the 90 deg cut off. I've tried adding a radius onto the 90deg part but it didn't make any difference.

 

Its worth noting that all of these ribs are made up of arcs not of splines.

 

Any help greatly appreciated as I've spent the best part of a day trying to get it to work and am starting to get a little worried.

 

Cheers

 

R

 

c1.JPGc2.JPG

10 ANTWORTEN 10
Nachricht 2 von 11
Anonymous
als Antwort auf: nicebikemate

Why are you creating this in Revit when this is something that Inventor would do much easier and much more efficient?

Nachricht 3 von 11
ToanDN
als Antwort auf: nicebikemate

What if you build all the ribs with the curved end instead of the hard 90 degree vertical line, create one form, then use a void to chop the curve end off?
Nachricht 4 von 11
nicebikemate
als Antwort auf: ToanDN

It's a good idea but I already tried it [☹]

And as for why i'm not using Inventor, because I don't have it and the job is strictly Revit.
Nachricht 5 von 11
RDAOU
als Antwort auf: nicebikemate

Working in conceptual mode an using a combination of reference lines and parametric points to create the desired skeleton/wireframe can easily solve ur issue.

This isn't that complex! Revit does far more complex forms than this depending on how one models them...that being said, it would be a good idea if you share what you did and how you tried to do it. That would help others in guiding you better



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Nachricht 6 von 11
nicebikemate
als Antwort auf: RDAOU

Unfortunately I'm still searching for a solution. I've managed to isolate the issue down to the fact that where two blended sweeps meet Revit can't seem to accept the fact that they're using exactly the same profile and forces them to unjoin. The only work around I've found is to offset the profiles in the plane that they're created but this obviously introduces inaccuracies into the surface - in some cases up to 40mm!

 

Incidentally we're not really talking about a particularly simple shape, the images above are just an extract of one section, the actual shape is a logarithmic spiral.

Nachricht 7 von 11
Alfredo_Medina
als Antwort auf: nicebikemate

Probably you need to do more profiles, closer to each other, so that the transitions from one profile to the next create less abrupt changes to do for the form. You should not need to do this in 2 forms. It should be just one form. The more profiles the better. It would help if you could provide a file or a sketch with the desired dimensions and the desired final result.


Alfredo Medina _________________________________________________________________ ______
Licensed Architect (Florida) | Freelance Instructor | Profile on Linkedin
Nachricht 8 von 11
nicebikemate
als Antwort auf: Alfredo_Medina

Unfortunately it's a sensitive project :verwirrtes_Gesicht:

 

I'll try and generate some more profiles from the Rhino model and see how I get on. Thank you for the suggestion.

 

Rob

Nachricht 9 von 11
FGPerraudin
als Antwort auf: nicebikemate

Hi everyone!?

 

So, you are using a rhino model to start with?

Here is what I suggest and it will provide with perfect result: 

Export the Rhino shape into Dwg or any other oformat that Revit will be able to import and then import it into your model.

 

You will then be able to either use it directly to recreate the exact shape (by exploding the import) or redraw it with as many sections as you need by cutting the imported geometry.

 

It should solve your issue...



Francois-Gabriel Perraudin
BIM management and coaching

Nachricht 10 von 11
nicebikemate
als Antwort auf: FGPerraudin

not quite. I've created a Rhino model from setting out drawings that have been provided. The rhino model itself, up until this point, has purely been used as a basis for quickly generating a stick model of the ribs which in turn were used to create the profile families and to interrogate the accuracy of the setting out information that was provided.

 

My knowledge of Rhino isn't really good enough to generate a watertight solid from the setting out I've got.

 

Nachricht 11 von 11
ToanDN
als Antwort auf: nicebikemate

In my opinion, Rhino's algorithm for lofting, sweeping, and any other 3D generations is much better than Revit. If it was me I would model it in Rhino and link the SAT solid file to Revit to generate surfaces.

If you really want to do the lofting in Revit with more profiles, you can still create the model in Rhino, draw planar surfaces crossing the model where you want the profiles, and Intersect each planar surface with the model to generate the profiles. Select only the profiles when export to SAT.

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