RIG QUESTION:Double Unrolling on Scroll - Simple or Not :)

Hey Guys,

I’ve been experimenting with curves, and I’ve found out very difficult to achieve such a simple thing like unrolling effect on scroll. For example check this tutorial - https://www.youtube.com/watch?v=zmyjT5XM6aA

I’ve been experimenting - with curves (shape keys) however I achieved the effect, but I spend lots of time trying to find a way by hooking the thing, I’ve try also with bend + lattice modifier…

but I’m still wandering is there a way to simulate this effect like in real world, for example like cloth simulation, also what if the paper is attached to some objects (something like this wooden holders - http://www.turbosquid.com/3d-models/…-scroll/907160). Or what if there is a inner force generated - https://www.youtube.com/watch?v=qvFN-DFnFto).

I think this goal is simple but the same time very tricky. I will appreciate any feedback, tips, advice just everything about how this effect could be achieved aside from “curve shape keys” like I did it. (https://www.youtube.com/watch?v=zmyjT5XM6aA


It wouldn’t technically be a simulation, but one option would be to make an armature running the length of the paper. You can parent the paper to the armature, and then unroll the armature manually to unroll the paper.

Actually simulating the paper wound around rollers would probably take quite a while, because you’d likely have to raise the quality of the simulation and collisions very high. I wouldn’t be surprised if there were still issues with the paper colliding properly with itself when it’s wound around the roller several times, too.

I’ve never used shape keys, though, so I can’t comment on whether they’d be helpful or not.

My suggestion would be to manually animate it once and save it as an action, and then use an action constraint (http://www.blender.org/manual/rigging/constraints/relationship/action.html) to control that action in the rig. If I remember corrrectly, this is explained in the finger rigging part in humane rigging, but it has been a while so I may be misremembering.

The alternative would be to look at the finger rig in rigify which does curling/uncurling and create a version of that but with more bones to get a smoother effect.