Objects evaluate keyframes, then constraints so the keyframe should
reset the orientation then the constraint will kick in and reevaluate
the orientation for you.
On Thursday, January 02, 2014 3:49:29 PM, Alan Fregtman wrote:
Because you didn't keyframe it?
Kinematics evaluate per frame and if you jump around too violently in
your timeline you're gonna get inaccuracies unless you lock things
down a bit by using keys or strict upvectoring. Keys give it a
starting point from onto which to evaluate the constraints on.
On Thu, Jan 2, 2014 at 3:33 PM, Paul Griswold
<[email protected]
<mailto:[email protected]>> wrote:
Yes and no. I guess more than anything I don't understand why, if
an object has a 0,0,0 rotation on frame 0, but path constrained.
Why when you jump from a frame back to frame 0 does it inherit
whatever rotation it had rather than return to 0,0,0?
ᐧ
On Thu, Jan 2, 2014 at 2:28 PM, Ponthieux, Joseph G.
(LARC-E1A)[LITES] <[email protected]
<mailto:[email protected]>> wrote:
Create a path(curve).____
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Create a null.____
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Path animate the null to the path, set it to tangent and set
the up vector.____
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Duplicate the null making it null1. Turn tangent off, reset
the orientation to zero.____
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Create a third null, position constrain it to follow the first
null. Second is identical in position so ignore it.____
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Constrain the third nulls orientation to the first null.____
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Constrain the third nulls orientation to the second null. Open
the top orientation constraint of the third null and adjust
the blend weight. You may need to use a rotation
offset(probably 180 in Y) to get the appropriate blend.____
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Use the blend weight to blend from the first null to the
second null orientation, keying it to adhere to the tangent
null as needed.____
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Constrain the object you want animated to the third null. ____
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Is that what you want?____
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--____
Joey Ponthieux____
LaRC Information Technology Enhanced Services (LITES)____
Mymic Technical Services____
NASA Langley Research Center____
______________________________________________________
Opinions stated here-in are strictly those of the author and
do not ____
represent the opinions of NASA or any other party.____
__ __
*From:*[email protected]
<mailto:[email protected]>
[mailto:[email protected]
<mailto:[email protected]>] *On Behalf
Of *Paul Griswold
*Sent:* Thursday, January 02, 2014 2:02 PM
*To:* [email protected]
<mailto:[email protected]>
*Subject:* path constrain Q (duh moment)____
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When you path constrain an object & have it point along the
path as well as maintain tangency, how do you get it to reset
it's rotations back to 0,0,0 when you scrub back to frame 1?____
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Setting a key causes unwanted rotations & setting a neutral
pose doesn't seem to work.____
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I know this is a face-palm moment....____
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-Paul____
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ᐧ____
