spiral a curve around another

Forums Technical Discussion spiral a curve around another

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AndyW: Member; 336 posts; Joined: Dec. 2014; Offline

Aug. 23, 2017 12:44 p.m.

Any tips or examples on how to spiral one curve around another in vex? I had a crack at it but my vector math is failing me a little, and a few examples I found on this forum lacked controls for frequency offset and amplitude


animatrix_: Member; 4495 posts; Joined: Feb. 2012; Offline

Aug. 23, 2017 1 p.m.

Hi,

You can use something like this:
https://www.dropbox.com/s/hc3ejsro1e8xwjd/Coil_SOP_Animatrix.otl?dl=1 [www.dropbox.com]

Senior FX TD @ Industrial Light & Magic
Get to the NEXT level in Houdini & VEX with Pragmatic VEX! [www.pragmatic-vfx.com]

youtube.com/@pragmaticvfx | patreon.com/animatrix | animatrix2k7.gumroad.com


AndyW: Member; 336 posts; Joined: Dec. 2014; Offline

Aug. 23, 2017 1:43 p.m.

very very cool!


patar: Member; 280 posts; Joined:; Offline

Aug. 23, 2017 2:26 p.m.

theres something wrong with the asset it doesnt work well…
check out the first image its created with your asset…as you can see it doesnt twist around the curve

Attachments:
Capture5.JPG (114.4 KB)


patar: Member; 280 posts; Joined:; Offline

Aug. 23, 2017 2:27 p.m.

mine works better imo…

Attachments:
Capture4.JPG (188.5 KB)
twistAlongCurve.hip (318.1 KB)


animatrix_: Member; 4495 posts; Joined: Feb. 2012; Offline

Aug. 23, 2017 2:49 p.m.

patar
theres something wrong with the asset it doesnt work well…

That's because you don't know how to use it.

Senior FX TD @ Industrial Light & Magic
Get to the NEXT level in Houdini & VEX with Pragmatic VEX! [www.pragmatic-vfx.com]

youtube.com/@pragmaticvfx | patreon.com/animatrix | animatrix2k7.gumroad.com


patar: Member; 280 posts; Joined:; Offline

Aug. 23, 2017 2:52 p.m.

how to make it twist along this curve as it should?

Attachments:
twistAlongCurveAnimatrix.hip (79.6 KB)


patar: Member; 280 posts; Joined:; Offline

Aug. 23, 2017 2:58 p.m.

it seems it doesnt exactly follow the guide

Attachments:
Capture6.JPG (70.0 KB)


patar: Member; 280 posts; Joined:; Offline

Aug. 23, 2017 3:08 p.m.

yours is creating a coil alright… but doesnt exactly twist around the guide curve..
oh well use what ever you like just trying to help…not to start a war..

best regards
Patar


BabaJ: Member; 2036 posts; Joined: Sept. 2015; Offline

Aug. 23, 2017 3:25 p.m.

Don't know what your talking about - His method twists around the curves I supply for it.

And just the same as you; not wanting to start a ‘war’.


patar: Member; 280 posts; Joined:; Offline

Aug. 23, 2017 3:32 p.m.

check out the image the coil doesnt exactly follow or curl around the guide curve…you can examine this especially when the amplitude is small….
who ever supply the method its not 100% correct…no need for complex math… simple high school math is enough its just sine and cosine …..
wheres my simple solution will always follow or curl around the guide curve..


AndyW: Member; 336 posts; Joined: Dec. 2014; Offline

Aug. 24, 2017 9:38 a.m.

The asset works perfect, my guess is you're feeding it a curve with too few CVs. Re-sample your guide curve.


patar: Member; 280 posts; Joined:; Offline

Aug. 24, 2017 10:12 a.m.

ahhh yes… its working now sorry….


Richard Costin: Member; 101 posts; Joined: May 2006; Offline

April 15, 2020 7:40 a.m.

patar
mine works better imo…

Thanks! Most helpful.

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