Repeating something along a curve and extrude it along another

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Permalink Reply by Shawn Swisher on June 24, 2015 at 10:36am

I just did something similar to this, and I was able to make it mostly work. If you post your file, I could build it out a little for you but basically it works like this:

Loft the two curves. Create Perp Frames along the bottom curve and create rectangles large enough to pierce through the entire lofted surface on those perp frames. Then, use a Brep|Brep intersection to find the lines that are created by the planes and loft surface intersection, and use those as Z-vectors to extrude your shape. It should follow the height and orientation of your guide curves perfectly.

Edit: I've been tweaking my own script and I've been told it may not be the best way to achieve it. It might be worth it to you to give it a shot anyway, but just know that I may be updating you later with a better way.

Permalink Reply by Mitch Alair on June 25, 2015 at 2:26am

Hi Shawn, thank you very much !

Usually I like to test new stuff by myself but I admit the operation seems a bit complicated for me here :)

I uploaded .3dm and .gh of my work here. If you have 5 minutes in your spare time, it would be just great ! :)

Ps : You'll see in the .gh another version of the script, with an attempt to add colors to it (it works nice but never managed to bake it, nevermind). You can tweak whatever script you like here.

Thank you VERY MUCH for your time Shawn.

Mitch

Attachments:

• envoi_cloture.3dm, 1.4 MB
• envoi_cloture.gh, 10 KB

Permalink Reply by Mitch Alair on June 25, 2015 at 10:19am

Well, I've been trying on my own to do as you said Shawn, but this is really beyond my skills here :)

I found something interesting here (http://www.grasshopper3d.com/forum/topics/perpendicular-frames-on-a), but I need to base this script on a Rhino geometry (actually I'm designing a fence).

Again, thank you for your time :)

Permalink Reply by Pieter Segeren on June 25, 2015 at 5:43pm

Hi Mitch,

here's a fix based on your input curves (which are a bit 'off' - watch them in TOP view to see what I mean by that). That's the one in the cyan group. Below that, two slightly altered approaches.

Attachments:

• envoi_cloture_PSG.gh, 41 KB

Permalink Reply by Mitch Alair on June 26, 2015 at 2:09am

Thank you very much Pieter :)

I just had a look on your scripts, I haven't got it all yet, but it looks really promising !

And you are right for the curves which do not exactly get along. Actually these two lines will be a collection of straight lines eventually, it should be easier to manage.

Loads of thanx again, I will meticulously analyse (and try to understand ^^) what you sent me when I have a moment.

Best !

Permalink Reply by Mitch Alair on June 26, 2015 at 2:33am

Ok, I couldn't resist tweaking your script, and I already do have a small question :)

See the image attached. I just reassign the two curves to new lines on Rhino, haven't touched anything else. Why is that on the right of the picture, when the first curve aims high, the upper line does not cut anymore ? Is that because the starting curve is no longer in 2D ?

Permalink Reply by Mitch Alair on July 2, 2015 at 9:10am

Anyone who could answer me here please? :)

Thanks a lot !

Permalink Reply by Shawn Swisher on July 2, 2015 at 11:51am

Mitch,

Sorry I'm just getting back to you now. I'm going to look over everything and see what I can do.

Permalink Reply by Shawn Swisher on July 2, 2015 at 12:22pm

Mitch,

Take a look at the attached files. I think I've got what you want. The definition I created takes the two curves and divides them into an equal number of points, then creates a series of vectors between the two sets of points to extrude a rectangle from. You could change the extrusion shape to pretty much any extrudable curve.

Hope this helps, and sorry for the long wait. It was a very hectic week at work and I had to get some of my own grasshopper stuff to waiting consultants.

Attachments:

• envoi_cloture_rev1.3dm, 1.4 MB
• envoi_cloture_rev1.gh, 18 KB

Permalink Reply by Mitch Alair on July 3, 2015 at 2:10am

Thank you so much Shawn. It seems super nice ! And you managed to include the color gradiant, bravo !

I couldn't find the two rhino curves on your file, but I switched tour script to another rhino (see the picture on this post).

There's only ONE thing I'd like to change here : having all the rectangles PARALLEL (perpendicular to the floor for instance). I'm gonna try to set this by myself, but if you have any clue, do not hesitate :)

Again, thank you for your time !

PS : Just for the record, I'm an architect designing a school in France here, and this is the fence we're talking about. If I can do this, you'll see it built someday ;)

See it here ! :)

http://www.lemoniteur.fr/article/air-architectures-signera-l-extens...

Permalink Reply by Mitch Alair on July 3, 2015 at 2:16am

Alright at least I understand why rectangles are not paralel, since the same division is applied to both curves, and they have not the same length...