How to add more than one attractor point?

Replies to This Discussion

Permalink Reply by Danny Boyes on April 10, 2011 at 3:48am

Hi Ra,

 

How's Melbourne? My brother just moved there this week for a 6 month secondment to an office out there. He thinks it's fabulous and is making me jealous already.

 

Any way back to your problem, you need to distinguish which point each frame finds closest. So you need to add a CP between the Surface CP and the distance component.

 

Attachments:

• straps_mk2.ghx, 267 KB

Permalink Reply by Ra on April 10, 2011 at 4:41am

Hey Danny!

 

The weather is bipolar as usual. We had 27 degrees celcius of sunshine few days ago and now it's dropped to 13 with clouds and rain. Just peachy though good to hear that your brother is enjoying it here!

 

Great! I'm trying to do it with a string of points on a curve. Unfortunately, I don't really get a smooth transtion

 

Any ideas how I can get it the straps to rotate smoothly along the curve?

 

Thanks a lot!

 

Ra

Permalink Reply by Danny Boyes on April 10, 2011 at 5:16am

Remember that the point you are measuring from is the centreline of the surface. Therefore what I see in the image above makes sense. The start and the crossing of the curve are the largest openings regardless of the density of points.

Draw a line between the Frames and the CPs to visualise what the distance measured is until you get a grasp of what is happening. That way you can see where you need to tweak the curve or number of points.

Permalink Reply by Ra on April 10, 2011 at 5:30am

Ah. Would there be a way to swap the center line with my curve so that the frames will rotate where the points on my curve are?

 

I tried joining the lines from the frame but it's doing this

Permalink Reply by Ra on April 10, 2011 at 8:44am

I've nearly managed to move the middle torque-ing lines. Have a look at the attached grasshopper file. Only problem is I'm using the distance component to move these points and so that sifts out the negative numbers causing those values to bounce back up

 

Yellow line is my curve but as you can see, the points have moved up instead of going towards the points.

 

Is there another component that I can use instead of distance?

Attachments:

• straps3.3dm, 946 KB
• straps4.ghx, 763 KB

Permalink Reply by Danny Boyes on April 10, 2011 at 12:36pm

Instead of Distance use vector between 2 Pts this is then the vector you move by. There is a Length output as well if you only need the magnitude elsewhere.

Permalink Reply by Ra on April 10, 2011 at 8:51pm

Great! I will try it out! Thanks!

Permalink Reply by Danny Boyes on April 11, 2011 at 1:30am

I was thinking about this on the way to work. What you probab

Permalink Reply by David Rutten on April 11, 2011 at 2:21am

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Permalink Reply by Danny Boyes on April 11, 2011 at 2:25am

woops! I swear I wrote the whole message out.

What I tried to say was decompose the vector2pt and get the Y component only.

But you might be onto something there David.... 

Permalink Reply by Ra on April 12, 2011 at 2:14pm

Strange enough, I plugged in vector between 2 pts and extracted the y values but they're still coming up as positive numbers

 

 

What did I do wrong!

Attachments:

• straps4a.3dm, 7 MB
• strap4a.ghx, 1 MB

Permalink Reply by Danny Boyes on April 12, 2011 at 4:10pm

Don't pass it through the Y vector Component. Use the decompose Vector Component to get the Y 'component' i.e. portion.

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