gradual spacing in surface division

Hi all,

another grid question: I want to be able to control (separately) the spacing of U and V surface division. Right now If I divide a surface I get equal spacing divisions along U and V:

I want to be ale to control this spacing gradually, so it looks like this (but better, done in photoshop):

I need to control that spacing in U, and in V separately.

I like the idea of using a graph to drive it, but I do not know where I should plug the graph.

Thanks,

Gustavo

Replies to This Discussion

Permalink Reply by gustavo fontana on August 2, 2017 at 1:20pm

here-s a good example of gradual spacing applied to curves, I 'd like to do this to the UV spacing of a surface divide:

http://www.grasshopper3d.com/forum/topics/gradual-geometry-array-gr...

Permalink Reply by Julian Buhagiar on August 2, 2017 at 2:48pm

Here's one way controlled by the graphs. maybe you can adapt it.

Permalink Reply by Julian Buhagiar on August 2, 2017 at 3:05pm

had another look at it... this version works better.

Attachments:

uvDivider.gh, 17 KB

Permalink Reply by gustavo fontana on August 2, 2017 at 3:14pm

Hi Julian, thanks for sharing. I tried to adapt this to my surface and give separate numbers to U and V and somehow they can only go up to 11 in each direction. if I move my point count up beyond 11 in either direction nothing happens. Any idea why?

Attachments:

UV_divider_capped_to_11.3dm, 200 KB
uvDivider_capped_to_11.gh, 21 KB

Permalink Reply by Julian Buhagiar on August 2, 2017 at 3:41pm

in answer to your question, I think it was because of the normalisation happening multiple times, there's are mapping in the graph and then there were some outside it too....in later version I just decided to keep everything between 0 and 1 and remove the complexity.

I thought there would be benefit in not normalising it originally and using true lengths, but this wasn't the best way if you want to apply to any surface.

Permalink Reply by Julian Buhagiar on August 2, 2017 at 3:26pm

Made more efficient.... and packaged it up into a cluster.

I think this will work too on your file.

Attachments:

uvDivider.gh, 20 KB

Permalink Reply by Julian Buhagiar on August 2, 2017 at 3:30pm

You can have a play with the graph type by right clicking... Linear, Bezier and conic I think work best.

Permalink Reply by Julian Buhagiar on August 2, 2017 at 3:34pm

(Or you can just supply the U and V parameters with a list of numbers between 0 and 1, divided up into intervals however you like)

Permalink Reply by gustavo fontana on August 2, 2017 at 4:32pm

this works great Julian! now I have another question related to this definition (sorry!)...

once I have my grid layout out I have to cull some rows/columns to treat those points differently down the line. so I had something like this to do my culling:

...so I was grabbing the points from the Sdivide and picking rows/columns.

my question: where do I pick those points now in your definition? because if I pick the points that you have as output is not working. And if I pick them from dividing my original surface they do not match up with the gradually spaced ones your definition creates.

Thanks!

Attachments:

culling_border_3rows01.gh, 12 KB

Permalink Reply by Julian Buhagiar on August 3, 2017 at 2:19am

From the point output that my cluster makes, you'll notice the paths (0;#}
Each path created is a U line, and each item in the path is V.

You can use components from the sets ribbon to select the items you want, e.g index item would enable you to select the V, and tree path will allow you to select the U you want.

Also, if you graft the output, all your Vs will also become paths , {0;U;V} which then means you can solely stick to set tree components for your tree manipulations.

Permalink Reply by Julian Buhagiar on August 3, 2017 at 2:45am

There's a paths tutorial storyboard I put together here, which might help you.

http://www.grasshopper3d.com/xn/detail/2985220:Comment:1792378

Permalink Reply by Julian Buhagiar on August 3, 2017 at 3:47am

Masks seems like a good technique for your application.

Attachments: