I used to do this by getting the animated XYZ for some part of a rig out of
Maya, then importing it onto an Axis and computing the distance to a Camera by
plugging both into this:
Scene {
inputs 2
name Distance
addUserKnob {20 Distance}
addUserKnob {7 o R 0 1000}
o {{"sqrt(pow(input1.translate.x - input0.translate.x, 2) +
pow(input1.translate.y - input0.translate.y, 2) + pow(input1.translate.z -
input0.translate.z, 2))" i}}
}
To be honest though, this gives you an inhuman level of accuracy. I think
setting a keyframe every second or so will look more like a real focus puller
who can't necessarily twist the knob fast enough...
--
Lewis Saunders
robotic 1st ac
London
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