Auto-resetting Active Rigid Bodies

[genny27]

Hi everyone,

I've been using Maya for a couple of years now, but this is my first time using dynamics. I'm probably doing something pretty obvious wrong, so it'd be great if someone could point me in the right direction!

I've created an object which I would like to collide with a turning cog/gear and be carried around by the motion of the gear (expression driven) as well as being affected by gravity. The gear is a passive rigid body, and the object is an active rigid body.

I can make this work the first time that I play the animation, but if I want to go back and tweak a value (mainly bounciness) I have to start all over again. This is because my active rigid body will not reset itself... it will start from the last place that it was in the scene.

I've Googled as much as I can but can't seem to find anyone else with the same problem. Any help would be greatly appreciated!

Genny.

[joojaa]

your actually not missing anything. This is the trade of you opted for when you started to use dynamics.

QUOTE(genny27 @ 01/10/09, 02:44 PM) [snapback]298615[/snapback]
I can make this work the first time that I play the animation, but if I want to go back and tweak a value (mainly bounciness) I have to start all over again. This is because my active rigid body will not reset itself... it will start from the last place that it was in the scene.

Thats kindof the idea, onorder to go form

a to b to ce to d to z you nee dto geo trough all of them. Now if you ever work with 5000 frames of dynamics you will definitely not want to do that unless you really really must. So you want to dsay the computer when to update because you jauts cant wait 3 seconds every time you od something.

So cache your solution.

QUOTE
I can make this work the first time that I play the animation, but if I want to go back and tweak a value (mainly bounciness) I have to start all over again.

frame 100 cant know what it looks like unless its done frame 99 and 99 cant do without knowing 98 up to first frame. So unles syou compute form farme 0 you cant know.

But yes you can ask maya to update without showing to you, its just potenttially slow* so maya supresses this behaviour.

*Its not uncommon for a 100 frame simulation to take few hours to compute. So you definitely wont want to wait few hours every time you choreograph the change.