Grasshopper

algorithmic modeling for Rhino

Hey guys,

I'm struggling with i thought would be something simple, but turned out rather difficult. I've converted a brep (consisting of 2 surfaces) to a mesh surface with a U and V subdivision. I'm trying to get the vertices in the 'right' order, i mean left top to right bottom, like the order from the divide surface component. 

Instead this happens (see attached)

 

There should be like an easy trick to figure this out, my mesh is all quad based, so no funky stuff. Ive tried flattening and sorting points, but that didnt work out.

Thanks in advance for your advice!

AW

 

 

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Have you tried the Flip Matrix component (located in Sets>Tree)?

No it doesnt work, it just flips the U and V. Im trying to reorder the points from left top to right bottom (like the divide surface component does let's say). The order in the first image is off sometimes, maybe that wasnt clear, look at point number 44 it jumps 'weird' to point 45.

The example attached is the preferred order. 

Thanks for the fast response!

aw

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did you try to use sublists? cause to me it looks like a flattened list of points.

 

U can (for this last example) stick a sublist component for your point list and make domains like following ( 0-8, 9-17....,126-134), in the end you ll have a tree with a certain number of branches each containing one row of points.

I see the problem now. I have a solution that works for a single surface where the mesh Vertices get jumbled but I'm still working on a BRep made of two surfaces.

I'll get back to you on this.

Hoi Arie-Willem, I think you'll need the pathmapper, though I'm not very good at this yet, I've made a little definition that might help.
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The problem is that the initial order of the points is already 'messed up'. If the points were already ordered in some way, like row by row, of course i could do whatever i want. Using pathmapper/sublist or series to get the desired effect like you showed in your example Pieter thanks for that. 

 

The problem is the initial order is weird. If you could find a solution Danny that would be awsome, 

Thank you all!

Okee Arie-Willem, could you upload your definition so we can have a look into why the order of your initial points is weird?

Sure pieter see attached. 

It requires weaverbird mesh components installed for grasshopper (http://www.giuliopiacentino.com/weaverbird/)

this is just an example file with 3 curves and when lofted turned into a brep. I need the surface to match the curve lines. My original file is more complex of course, but this is in simple the problem I'm facing,ordering the points row by row, ascending, like the subdivide surface. It needs to stay a mesh because of topological reasons. 

Good luck and thanks again!

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Hi Arie-Willem,
I haven't been working with meshes a lot, and I do not understand how the meshpoints are numbered or sorted if you wish, even if it's unjoined meshes. Hopefully Giulio himself can help you out, and teach us something more about this ...

I found a component which keeps track of the vertices numbers, called face vertices. I didn't see that one before. With this component it doesn't really matter which sequence the vertices are ordered. If your mesh is quad based it remembers the number which you later on can refer to.

Im going to struggle a little bit further and ill post my findings.

Cheers,

AW

 

Hi Arie-Willem,
I've found a discussion that just might apply to what you are doing too. (if your surface isn't too wavy) I thought the 2d-sort.ghx by David Rutten himself might give more insight.
http://www.grasshopper3d.com/forum/topics/sort-mesh

Hi Arie-Willem,

Did you solve this. I know this was quite a long time ago however I have been needing a similar thing. Using the script that Pieter posted above, 2-d sort I have tried to change some of the inputs to sort points by U and V values rather than along a guide or by cartesian co-ordinates which may help you. You may need to change the multiplier within the function if it doesn't quite work for you.

I posted the solution on this discussion: http://www.grasshopper3d.com/forum/topics/sort-mesh?commentId=29852...

Let me know,

Michael

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