Creating diagonal lines within a grid

Hi,

I would need some help here: How do I create lines between the points I have marked in the picture? I'm trying to split the points in different lists but I can't figure out how to do it. The size of the grid will vary and needs to be hooked up to a slider.

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Permalink Reply by Ali Tabatabai on August 31, 2009 at 3:43pm

Hi,

I would suggest to use series and xyz-point to create the grid! Take a look at Mohamad Khabazi's AlgorithmicModelling (page 32). It could help you!

You can download it from http://download.mcneel.com/s3/mcneel/grasshopper/1.0/docs/en/Algori...

//A

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Permalink Reply by voronoiii on August 31, 2009 at 10:37pm

Hi Ali,
thanks for posting the tutorial, There a some rendering in the tutorials, All have same quality of rendering, not only in this tutorial but i have seen a lot of renderings with same quality in other resources also, Do u know in which engine/software were those rendered,..??

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Permalink Reply by Ali Tabatabai on September 2, 2009 at 2:29am

Dear Krish,

I'm not sure what renderings you are referring to!
If it's the green lines you mean, I assume people just grab the screen and do it in Photoshop or other image-editing programs!

I'm sorry I can't help you more...
//A

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Permalink Reply by Stencil on September 3, 2009 at 1:50am

Krish: I'm pretty sure it's V-ray renderings, but I could be wrong.

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Permalink Reply by Stencil on September 1, 2009 at 12:30pm

Thanks for the tip Ali, I will look into this tonight!

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Permalink Reply by Stencil on September 3, 2009 at 2:50am

Sorry, I'm not getting it to work. Khabazi seems to skip some steps in his explanation in "Algorithmic Modelling" (page 32), so I'm not able to follow him.

I'm generating the first row of points with a SERIES and a POINT XYZ, but I'm not following him on how to use the SHIFT LIST in order to get several rows of points.

Would greatly appreciate any help I could get.

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Permalink Reply by Ali Tabatabai on September 7, 2009 at 3:09pm

I agree, it's kind of fuzzy...

I think, what you need is to option-click your xyz-point and choose all possible connections (cross reference) to get the full grid!

also... put together - fig. 3.20 and fig. 3.22 - to see all connections.
Here is a rebuild of that def.

//A

Attachments:

diaGrid.ghx, 99 KB

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Permalink Reply by Stencil on September 7, 2009 at 3:36pm

Great! Will look into this soon and try what you suggested. Thank you!

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Permalink Reply by Stencil on September 9, 2009 at 4:03pm

Yes, it worked! I still have one last problem to solve though, and I'm hoping that someone could help me on this one:

I've set up the grid of points, shifted and culled the lists in order to get four different lists of points that I could use to build squares (or triangles, or diagonals) with polylines within the grid.

Right now I would like to build squares. One for each "cell" of the grid. This works fine when I only have one "cell" in the grid, but once I increase the grid size, the polyline gets all messed up. I want each cell to be outlined with a polyline. Maybe this be an easy problem to solve, but I can't figure out how. I would greatly appreciate if someone could take a minute and look at my definition.

Attachments:

Trianglar2.ghx, 142 KB

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Permalink Reply by Ali Tabatabai on September 12, 2009 at 5:33pm

...well, quads and triangles are pretty different approaches when it comes to describing a surface. I'm not sure what you would like to do with the quad as the quads will never be planar when you have a double curved surface. The quads will end up being triangulated if you would like them to be planar...

But take a look at this def. and see if it helps!
Just create tow curves and take them in as input for the loft component...

//ALi

Attachments:

quad_surface.ghx, 202 KB

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Permalink Reply by Markus Wallner on October 21, 2009 at 11:13am

Hi Ali !
I have problems opening Your ghx file. I downloaded Grasshupper 0.5xxx (latest version from web). After Opening the file I gat an incompatibility message, that the file was created with version 0.6xxx. Am I missing a grasshopper update somewhere?
Thank You