[Sidefx-houdini-list] Quaternons and Lag CHOP

Edward Lam edward at sidefx.com
Thu Sep 1 12:51:12 EDT 2011

Have you tried changing the Method to "Lag Magnitude" ?


On 01/09/2011 11:57 AM, Pablo Giménez wrote:
> Hi all.
> I am having some weird problems trying to apply some CHOPs to quaternion
> channels.
> I have a quaternion rot attribute (vector4).
> I read it using a Geometry CHOP as rot[xyzw] channels.
> Then I apply a Lag CHOP ( I have similar problems using Spring). Most of the
> rotations for my points works all right, except some of them, some points
> randomly at some frames just flip.
> Like if I werent using quaternions and you get the typical rotations
> flipping due to euler angles limitations.
> If I pass through the channels and import my rot attribute again without any
> effect it works, but as soon I apply a lag it gives me this random rotation
> flipping.
> If I change  the lag parameters then the flipping happens in other points at
> different frames.
> Really weird.
> Has anybody tried to lag rotations using chops?
> Thanks.

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