KineFX Limit LookAt to single Axis

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Hey everyone,

I'm probably overlooking something, but how can I limit the Look At transforms to a single Axis?
I'm currently rigging a mechanical part and that part can only move on one Axis.

I know you can do that using standard constraints blending, but I've been using KineFX for all kinds of stuff lately and it works much more reliable and I don't want to miss the easy layering of animations through the Rig Pose node.

I've tried to split the matrix into separate transforms but that didn't work of course and I couldn't find a KineFX VOP that splits/limits/blends individual axis.
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I'm dealing with the same issue. Do you have a solution?
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If you want an axis-limited constraint, try inverting the usual aim and up terms so that your aim vector is the axis you want to be locked to, and the up vector is the direction you want to spin towards on this axis.
MOPs (Motion Operators for Houdini): http://www.motionoperators.com [www.motionoperators.com]
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