How to stretch a spherical dome

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Permalink Reply by David Rutten on April 3, 2015 at 8:14am

Hi Frede,

you can stretch or non-uniformly scale a shape, but it looks like you're trying to introduce creases or kinks where none exist yet. That is a much harder operation for two reasons:

• Nurbs surfaces in Rhino do not like to have creases in the middle. It's mathematically possible, but almost always a bad idea. Instead you should create a polysurface with a creased edge.
• The transformation from smooth to kinked does not have a continuous first derivative. All transformations and almost all morphs in Rhino have a continuous first derivative.

Perhaps it makes more sense to create the target shape from scratch rather than to deform an already existing shape?

Permalink Reply by Frede ranjit on April 3, 2015 at 8:40am

Oh, the drawing is a bit misleading.. 

I want the form without kinks/creates. I found the component "scale NU", is that the one you meant ? or is there another?

Permalink Reply by nikos tzar on April 3, 2015 at 9:01am

that's the one. you can use different values for scale in x, y and z.

Permalink Reply by Frede ranjit on April 3, 2015 at 9:11am

Thanks..