generative modeling for Rhino
Curve along curve
A quick question. I am trying to create a sine like curve that follows along a given curve. So I started by diving the curve and using those points. But in the end I am getting the points but their numbering is what I have to change. I know there is something that allows you to change the arrangement/ numbering points. Please help!
These are the points I get
But this is how I want the curve to go:
*Also, how come when I change the values for the plane normal it only affects between 0 and 1???
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Replies to This Discussion
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Permalink Reply by David Rutten on -
Hi Deepti,
what do you mean by "numbering"?
A Sine function has a period of 2*pi. If you want to speed up or slow down this frequency, you have to multiply a value to the variable PRIOR to calling the sine function. For example:
Sin(t)
gives you a wave with a period of 2*pi, whereas:
Sin(t*2)
gives you a wave with a period of only pi. Multiplying t with numbers higher than one will speed up the wave, while numbers between zero and one will slow down the wave:
Sin(t*0.1)
by reducing the t value to a tenth of its original value, the sine wave is slowed down to a period of 20*pi.
----
If you want to adjust the amplitude of the wave, you have to multiply AFTER the sine function. The default sine:
Sin(t)
will go from -1.0 to +1.0 on the vertical axis, whereas:
5 * Sin(t)
extends from -5.0 to +5.0
--
David Rutten
david@mcneel.com
Poprad, Slovakia
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Permalink Reply by Deepthi on -
Thanks for the reply David! But as you can see in the images, I didnt try to build it so far using the sine function [well because I dont know how to make it follow along a curve]. So how does the pi factor come in?
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Permalink Reply by Manuel on -
Use the weave component with the two list, that will produce the "numbering" thing that you are looking for.
Also i think that someone already do what you are doing but using the sin component or formula (like the one David explain).
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Permalink Reply by Deepthi on
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Hey Manuel,
I tried searching the forums but couldnt find any discussion about sin component...Do you by any chance know the link to it? Because I want to learn how it can be done...
Many Thanks
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Permalink Reply by Josef R. fischer on -
I created something that might be helpful to your inquiry. Tell me what you think.
- Attachments:
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sine wave curves.ghx, 291 KB
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Permalink Reply by Patrick.Lindall on -
Hello everyone.
I am a newcomer to grasshopper and I found the forum method of learning just wonderful.
Working through the primer and some personal investigations I have been playing with curves through points and variables which effect them. Lots of fumbling and person frustrations aside, I seen this post and having looked at your Definition, Josef and your theory Deepthi and David I am most intrigued.
Still getting to grips with the idea of a "Weave". I have some questions for you.
I understand that adding a multiply you can adjust the amplitude of the wave. How could I vary the amplitude across the wave with regards to "sinewavecurves" definition?
I attached an image to better illustrate my theory.
Any push in the right direction would be greatly appreciated.
Best patrick
- Attachments:
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amptitude_decay.jpg, 357 KB
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Permalink Reply by Josef R. fischer on
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It's been a while Patrick, as I've graduated and don't have access to rhino anymore. However, as I recall, there are graph buttons that allow you to project any number of formulas into a line like your picture. Once you put in the correct equation, it would then just be a matter of mapping the output to the .ghx already supplied here.
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