Choppy lofted curve

Replies to This Discussion

Permalink Reply by Michael Pryor on September 12, 2011 at 3:20pm

GH just displays curves oddly sometimes, It usually always translates back to rhino correctly.

Permalink Reply by Chris Tietjen on September 12, 2011 at 7:20pm

Chris

Permalink Reply by Oliver Sjöberg on September 13, 2011 at 4:39am

Thanks both Michael and Chris for your answers!

 

Chris: It gives me almost the right geometry but it's still a bit choppy when you zoom in.

 

But the following question is; What geometry will GH follow in the later steps, the choppy or the correct in Rhino? Because this is not the final geometry...

 

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Another question is how can I place these curve on a surface? Tried with "Curves on surface" but couldn't figure out how to create uv-points for this geometry. Anyone got a clue?

 

I'm also uploading the corrected ghx which includes the surface.

 

Thank you!

 

Oliver

Attachments:

• Weave.ghx, 717 KB

Permalink Reply by Chris Tietjen on September 13, 2011 at 5:44am

In any case here you're only looking at the display mesh and not the geometry.  The geometry will be correct.  It's just an issue for presentation purposes.  I'm not sure how to adjust the settings in the mesh component for greater refinement. They may already be max-ed out.

 

Chris

Permalink Reply by Michael Pryor on September 13, 2011 at 7:24am

the "red" grasshopper ghost is choppy alot, it always bakes into rhino correctly, its just a display issue with grasshopper, for the curves try map to surface or project to surface.

Permalink Reply by Chris Hanley on September 13, 2011 at 3:33pm

Oliver,

I took a quick stab at "remapping" your pattern from one surface to the next.  the attached sketch is pretty rough, but the logic is as follows;

-Create grid of uv points on a surface, (base surface)

-Cull the columns/rows to get alternating points

-weave points together and generate horizontal interpolated curves

-mirror those curves, (planes at first point in each row)....clean up first and last curves

-divide curves by number of U divisions and find closest points on base surface

-Reference in target surface from Rhino

-Evaluate the referenced target surface with the UV coordinates of the Base Surface.

(with both surfaces reparameterized, the UV domains will both be 0 to 1, therefore, evaluating the target surface with the UV coordinates of the points on the base surface, the points will be effectively "remapped" to the target surface).

anyway, I hope that helps you understand one way to "remap" uv coordinates from one surface to another.

GH 8.0051

Rhino V5 WIP 9/7/2011

Attachments:

• remapping.ghx, 255 KB
• remapping.3dm, 88 KB

Permalink Reply by Oliver Sjöberg on September 14, 2011 at 9:13am

Hello Chirs and thank you for taking time solving the problem.

 

I have a final question about the symbol used in the picture of you GH canvas. I use GH v. 8.0010 and don't have the same functionality as you. What are the symbols at the end of Mirror and Basepattern.

 

Thank you once again!

 

//Oliver

Permalink Reply by Chris Hanley on September 14, 2011 at 10:43am

the symbol represents that the data tree has been "simplified".  Simplify is available by right clicking on a component input/output, (similar to graft, flatten, etc..)  It was introduced in one of the recent releases.  The same functionality could be achieved by using the path mapper component.

EDIT: I should clarify, the simplify tree component, (sets->Tree->simplify Tree has been around for the last few releases). The ability to right click on a component input/output and choose simplify is reasonably new).

In this case, it was used to "clean up" the data structure.  I think the definition will still work with out it, but the data trees start to get a little messy.

 

David describes it much better here.

http://www.grasshopper3d.com/forum/topics/problem-with-the-simplify

 

Permalink Reply by Oliver Sjöberg on September 20, 2011 at 4:25am

Thank you very much Chris! Your help has guided us in the right direction and we're been able to proceed with the project.

 

//Oliver

Permalink Reply by Kaz on March 16, 2014 at 11:54am

Thank you Chris .. this is Great !