Subdividing surface problems!!

Replies to This Discussion

Permalink Reply by Danny Boyes on November 1, 2011 at 1:54am

The object you are trying to divide is a BRep (polysurface) this component will only work with surfaces.

 

Permalink Reply by Martin Dembski on November 1, 2011 at 2:01am

Hi Viviana,

 

the problem is that your Loft creates a Brep and a Brep consists out of multiple Surfaces (in your case 4 Surfaces) so you need to explode the Brep, if you want to subdivide the surfaces but there you always have the problem that each surface (if it is a big or a small one) is subdivided the same way if you subdived it with the same Isotrim or Subdivide Component and this isn't always what you want.

A more elegant way is to create out of the Loft a surface by using the Loft options.

(Just have a look on the attached files.)

Hope this helps.

 

Best,

Martin.

Attachments:

• grasshopper_loft.ghx, 631 KB
• grasshopper_loft.gh.3dm, 56 KB

Permalink Reply by Viviana Ortiz on November 1, 2011 at 8:29pm

Hey, I was able to solve it with your help,, THANKYOU!! I have another doubt in the same project. I am trying to create multiple lofts from two offset curves and a circle at the center, yet for some reason the result is twisted. Could you please help me with this?! Thanx agaain!!

Permalink Reply by Viviana Ortiz on November 1, 2011 at 8:36pm

Here are the files Im working with!

Attachments:

• loft_problem2.ghx, 596 KB
• loft_problem2.3dm, 3.5 MB

Permalink Reply by Martin Dembski on November 2, 2011 at 2:10am

Hi Viviana,

 

you just need to flip the middle curve.

I think this twist is a bug from the move component, I don't know why but if you move a curve with the move component in Grasshopper a certain distance the curve flips.

Have a look at the attached file, there I inserted 2 solutions.

1. write an expression (in your case -N) into the N input of the Circle CNR Component

or

2. put a Flip Curve Component after the Circle CNR Component.

 

Best,

Martin.

Attachments:

• loft_problem2.ghx, 612 KB
• loft_problem2.3dm, 3.5 MB

Permalink Reply by Viviana Ortiz on November 4, 2011 at 5:28pm

Thankyou Martin!! You've been VERY helpfull!! Thx again

Permalink Reply by Viviana Ortiz on November 8, 2011 at 12:19am

Hey Martin! I'm sorry to bother you again, but I'm having some trouble with the solution you gave me for the subdivision problem, It was very useful in most of my geometries, but there's only one wich won't work, do you think you could take a look?? it would be very nice from you, thnx in advance!

 

Viviana

 

Attachments:

• dividing problem.ghx, 579 KB
• model.3dm, 1.2 MB

Permalink Reply by Martin Dembski on November 8, 2011 at 2:00am

Hi Viviana,

 

no problem. :)

There was a problem with the controlpoints for the Curve Component in the beginning of your definition caused by your Referenced Curve.

In fact of this the Curve got a irregularity and the Loft couldn't adjust it as a single closed curve, the result was the Loft created a Brep existing out of 3 Surfaces.

There are 2 solutions I prepaired.

I did also some short explainations in the files attached.

Hope it is understandable and helpful.

If you have some more questions just ask.

 

Best,

Martin.

Attachments:

• dividingproblem.ghx, 633 KB
• dividingproblem.3dm, 1.3 MB