Animate a tube following a curve

Forums Technical Discussion Animate a tube following a curve

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Grendizer: Member; 375 posts; Joined: May 2014; Offline

Sept. 17, 2018 11:51 a.m.

Hello
How can I animate a tube growing and following a curve? I have tried Polyextrude but it does not behave the way I want.
Thanks
Gz

Houdini gamboler


brianBurke: Member; 192 posts; Joined: Nov. 2008; Offline

Sept. 17, 2018 11:59 a.m.

plenty of ways to skin a cat, but an animated carve sop could be a good way to achieve this.

here's an example

Image Not Found

Edited by brianBurke - Sept. 17, 2018 12:00:08

Attachments:
bb_anim_tube_v001.hip (119.5 KB)
llama11.png (172.4 KB)


Grendizer: Member; 375 posts; Joined: May 2014; Offline

Sept. 18, 2018 2:20 a.m.

Wow amazing! Thanks a lot for your example file and your time

In the carve node, if I delete channels and animate only “second V”, I get exactly what I wanted.
Some questions if you don't mind :
Whats the use of the Polyframe node, and the normal_and_up_vector VOP?
Good day
Gz

Houdini gamboler


brianBurke: Member; 192 posts; Joined: Nov. 2008; Offline

Sept. 18, 2018 2:05 p.m.

cheers gz. the polyframe and the vop are creating a normal and up-vector for the copy-to-points sop to use to align the circles along the curve.


Grendizer: Member; 375 posts; Joined: May 2014; Offline

Sept. 23, 2018 5:30 a.m.

Thanks Brian. I have some more questions if you don't mind.

1: How can I cap the ends of the tube? Since the points are not the same at both ends , as they are built during the tube's travel along the curve, how can I specify edges to cap holes?

Thanks
David

Houdini gamboler


BabaJ: Member; 2038 posts; Joined: Sept. 2015; Offline

Sept. 23, 2018 8:26 a.m.

Polycap node at the end will do you.

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