Divide surface /List Item Problem

Replies to This Discussion

Permalink Reply by Danny Boyes on December 14, 2010 at 2:45am

The output data structure has changed you will either need to flatten or use the path mapper to collapse the branches of the 'columns' up to the level of 'surface' something like {A;B;C}(i)-->{A;B} where C is the data path of your 'columns' of Points and B is level of different surfaces.

Here is the best explanation for the change of data structures talking about sDivide in particular: http://www.grasshopper3d.com/forum/topics/gh-ver-080001-divide-surf...

Permalink Reply by LGHRDSGN on December 14, 2010 at 3:07am

Thank you.

 

I've fattened the Items components, and it looks like Im on the right track, but now the Items point only on one point each, as you can see in the attached image. how can i make them collect all the first/second/third/forth points respectively to the four items components?

Permalink Reply by Danny Boyes on December 14, 2010 at 4:11am

Flattening is only suitable for getting all the points of individual surfaces together for multiple surfaces Pathmapper can be used (in your specific case {A;B;C;D;}(i) --> {A;B;C}. But as you are only after the corner points of each sub surface you could use the BRep Explode and get the vertices together in a list for each one.

Permalink Reply by LGHRDSGN on December 14, 2010 at 4:41am

Thank you so much for all your help.

 

I tried the BRep component, and it work great. The problem now is that when i try to connect a line through the items components, each item draws 3 lines instead of one and also it doesnt draw the lines on the face of the surface. what did i do wrong this time?

 

Permalink Reply by Danny Boyes on December 14, 2010 at 5:02am

I've seen a similar problem on someone else's thread recently. The double line coming out of the first list item should be dashed like the other. Can you post this specific example for me to have a look at please.

 

With regards to the line you are not choosing to draw a line on a surface just a simple line between two points. Otherwise this would be a way of getting them on the surface:

Here you are finding the UV co-ordinates of the corner points for each surface and then supplying those as locations for the interpolated curve on the surface.

Permalink Reply by LGHRDSGN on December 14, 2010 at 5:20am

I've attached the ghx and the rhino file. 

I've noticed the dashed prob' too- you can see in the image below that there's a difference between the data outcome of the 2 upper item components and the lower ones. I 'm not sure how's is it best to fix it.

 

 The last option you suggested works great for creating curves on the surface in one direction, but when i copy the CullN and the CrvSrf and give a different N parameter the curves go nuts....

Attachments:

• surface division.3dm, 26 KB
• Surface division.ghx, 114 KB

Permalink Reply by Danny Boyes on December 14, 2010 at 5:40am

You have the first two List Items set to cross reference. Change them to Longest List.

 

For the Culling issue either shift the list along with a shift list component with wrapped set to true before the CullN component or switch to a Cull Pattern Component that you manually set the order of True/False inputs.

Permalink Reply by LGHRDSGN on December 14, 2010 at 5:42am

Great. 

Thanks for everything!