Pull on one end of a rope to straighten the rest

Wondering how to accomplish a certain animation task? Ask here.

Moderators: Víctor Paredes, Belgarath, slowtiger

Post Reply
Wetfoot
Posts: 3
Joined: Sun Dec 15, 2013 9:48 pm

Pull on one end of a rope to straighten the rest

Post by Wetfoot »

Greetings,
I need a character to be fly fishing and I was wondering how I could move one end of the line to straighten out the rest of it.
I am new to this animation stuff and was hoping for a short cut.
Thanks,
Mel
Danimal
Posts: 1584
Joined: Thu Nov 15, 2007 3:06 pm
Location: The Danimal Kingdom
Contact:

Re: Pull on one end of a rope to straighten the rest

Post by Danimal »

If you set up the line with a chain of bones, you could make the far end of the chain the parent, allowing you to tug on the near end to straighten it out.

You could also lock the far end bone, which should also make it immune to the movement of the others.
~Danimal
User avatar
heyvern
Posts: 7042
Joined: Fri Sep 02, 2005 4:49 am

Re: Pull on one end of a rope to straighten the rest

Post by heyvern »

Using bones is one way to do that. However it might be easier to simply animate the points.

You could "eyeball" the "length" of the line and guess at keeping the length while straightening the line. This wouldn't require a ton of points on the line and might be simpler.
Wetfoot
Posts: 3
Joined: Sun Dec 15, 2013 9:48 pm

Re: Pull on one end of a rope to straighten the rest

Post by Wetfoot »

Thanks,
I was also thinking bones so I will give that a try first.
I have 88 bones to the line so far.
Not sure that is enough. I was afraid it would look too ridgit.
I am having the charactor do a lot of different casts on several animations so the easier the better.
Thanks,
Mel
User avatar
Víctor Paredes
Site Admin
Posts: 5817
Joined: Wed Jan 26, 2005 12:18 am
Location: Barcelona/Chile
Contact:

Re: Pull on one end of a rope to straighten the rest

Post by Víctor Paredes »

Wetfoot wrote:I have 88 bones to the line so far.
Not sure that is enough. I was afraid it would look too ridgit.
Uhm, 88 is a lot of bones. I think maybe 4 or 5 bones and a vector line with curvature should make the work. The more bones you put in a rope, the more difficult it becomes to animate them.
Image Image Image Image Image Image
Moho co-owner

Previously Rigged animation supervisor: My father's dragon, Wolfwalkers & Star Wars Visions "Screecher's Reach"
My personal Youtube Channel
User avatar
hayasidist
Posts: 3854
Joined: Wed Feb 16, 2011 8:12 pm
Location: Kent, England

Re: Pull on one end of a rope to straighten the rest

Post by hayasidist »

my general approach to things like this is to have the straight line as the frame 0 set up, then on frame 1 push the points to the "curled up" position and, when you want it to straighten (say between frames 100 and 120 or whatever), copy the frame 1 keys to frame 100 then "reset points" on frame 120. if you don't like the effect, add a few extra tweens.

as it seems you'll need multiple "straight" (for the different casts?) you could do this with a switch. or just tweak the "baseline straight"...
User avatar
slowtiger
Posts: 6256
Joined: Thu Feb 16, 2006 6:53 pm
Location: Berlin, Germany
Contact:

Re: Pull on one end of a rope to straighten the rest

Post by slowtiger »

I'd do this with point motion - after all it's just a thin black line.

Tip: create that line on a grid first, with about 10 points in regular distance. Have the point of origin match one end of the line. If you need the straight line somewhere in animation, just copy from frame 0 and rotate. Work from that point on, forwards or backwards.
AS 9.5 MacPro Quadcore 3GHz 16GB OS 10.6.8 Quicktime 7.6.6
AS 11 MacPro 12core 3GHz 32GB OS 10.11 Quicktime 10.7.3
Moho 13.5 iMac Quadcore 2,9GHz 16GB OS 10.15
Moho 14.1 Mac Mini M2 Pro OS 13.7.6
Post Reply