 | | | Spin and tweener hell | Spin and tweener hell 2005-11-08 - By Harvey White
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On Tue, 8 Nov 2005 20:55:26 -0500, you wrote:
>Hi Group,
>
>I'm trying to create an animation of a ball rolling and am having all
>kinds of problems with the spin modifiers and tweeners. Working in
>Carrara 3 Studio for Mac.
>
>First, I discovered that you apparently cannot stack two spin modifiers
>on the same object - to simulate a ball that's rolling slightly off
>true axis, for example - only one modifier will work .
True enough. Group the ball with itself (just highlight it and
group), then apply the second spin modifier to the group. The first
one is applied to the ball itself.
>
>I also discovered that Spin Axis is apparently NOT keyframable. What if
>your ball bounces off a wall and changes direction?
What you would have to do is to apply the spin axis to the ball, then
try applying the change in rotation to the group (that contains the
ball). You'd really want to do this to control the proper axis of the
ball.
>
>I tried "the old fashioned way" , but the object motion tab will not
>allow any rotation values outside of -180 thru 180, so I couldn't set
>up a 2700 degree roll over 5 seconds, for instance.
True enough, and it will take the shortest route *to* there, so
there's little control over a rotation of more than 180 degrees.
>
>I'm trying to slow the ball to a gradual stop - which I've done with no
>problem as far as the actual motion of the ball, but I cannot get the
>spin to follow the same tweener curve. Let's say a one keyframe i start
>the ball spinning at 1.5 rot/sec (visually tracking the movement of the
>ball object), and then 5 seconds later, another keyframe of 0.0 rot/sec
>(where the ball stops moving). The only tweener that gives the expected
>result is "discreet" which stops spinning abruptly at the second
>keyframe. The other tweeners cause the spin to slow down and then
>reverse direction near the middle of the tween.
>
>WTF!?!
>
>I have been playing with curves, eases, and tightens till I'm
>cross-eyed.
>
>What am I missing here?
Not sure, since I haven't played with this particular problem. You
might try a formula, if possible. That would allow you to program a
rotation, *IF* the rotation can be programmed.
Harvey
>
>Thanks in advance for any help you can offer.
>
>
>Dana Wagner
>RDA Media Enterprises
>(770) 338-0629
>www.rdamedia.com
>
>
>
>
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