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3d ribbon falling off present

Posted on 2008-10-20
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Last Modified: 2013-12-04
so i have a gift/present modeled, but i'm having some difficulty getting the ribbon to fall off the box. i found an example on youtube that is pretty what i'm trying to make happen.
<A HREF="http://www.youtube.com/watch?v=QnPdaSxLMAA" TARGET=_blank>http://www.youtube.com/watch?v=QnPdaSxLMAA</A>
can anyone enlighten me? i'm using 3ds max 2009.

i've modeled the ribbon 2 different ways to see how the cloth plugin will react. i tried spline model and also a box. not sure what approach to do this. thanks!
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Question by:hybridart
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bham3dman earned 500 total points
ID: 22767996
Greetings hybridart,

I suggest using reactor to create the animation of the ribbon sliding off the box.  Here's the process:

1. Create a low poly ribbon (the more polygons, the longer it will take to simulate and create the animation).

2. Apply the reactor Cloth modifier to the ribbon (modifier list).

3. Assign the ribbon object to a Cloth collection (Create - Helpers - reactor - CLCollection). Check Avoid Self-Interactions to prevent the polygons to cross one another.

4. Assign the present and table (needed for the ribbon to fall onto) to a rigid body collection (Create - Helpers - reactor - RBCollection).

5. Use the reactor utility to setup your simulation parameters (Utilities tab - reactor).

6. In the Preview and Animation rollout, set the Substeps/Key setting to 100 or higher - this will improve the simulation's accuracy but take longer to simulate (highest setting is 1000).

7. In the Havok 1 World rollout, set the collision tolerance to .3" (this is about as low as you can reduce the collision tolerance without errors).

8. Select the present in the viewport and then open the reactor Properties rollout (bottom of the reactor utility).  Set the friction to 0 (this will allow the ribbon to slide off the present very easily).

9. In the Preview & Animation rollout, click Preview in Window.  This will open the reactor simulation window.  Press P to play the simulation.  Press R to reset the simulation.

10.  Close the preview window and make adjustments to your cloth modifier.  Adjust the stiffness and damping parameters.  A lower stiffness value will produce results similar to silk and damping will control how quickly the cloth loses energy (low settings will cause the ribbon to bounce, high settings will cause it to come to rest quicker). Preview your changes.

11.  When satisfied, click Create Animation on the utility panel.  This will bake the simulation into keyframes which will be stored in the cloth modifier (you can click Clear Keyframes in the cloth modifier if you need to).

12.  Apply a Turbosmooth modifier to the ribbon to make it appear more fluid.

I created a max file to demonstrate this process, but .max extensions are not allowed (even when zipped).  I'd be happy to email the file to you if you'd like to provide me with your email.

I hope this is helpful.
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by:bham3dman
ID: 22768022
Oops.  In step 3, the "Check Avoid Self-Interactions to prevent the polygons to cross one another." text belongs to step 2.
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by:hybridart
ID: 22768068
thanks for the suggestions bham3dman. i have attempted the cloth modifier on a few modelled ribbons but i just didn't know how to make it slide off the box. i tried using a wind modifier but that just blew the whole thing off from the bottom so the results were not good.

i would love to open your example...please send to email bp@hybridart.com.

thanks.
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by:hybridart
ID: 22768314
this is perfect thank you!
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Author Closing Comment

by:hybridart
ID: 31508134
thanks for the help and for teaching me about friction! that did the trick.
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