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Having an issue calculating the distance between my camera and a Null with an expression!?
length(transform.position, thisComp.layer(“Focus Control”).transform.position)
I have this expression above on the “Focus Distance” for my camera, I have the Null object with a layer parented to it…
I am trying to keep the camera focused on the Null as I move it around, but as you can see below, it’s giving me a Distance greater than the distance to my object and I have no idea why!
Can someone help?
Thanks!
My portfolio can be seen at http://www.ruesterprod.com
My personal website is http://www.azaallen.com -
2 Replies
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Your screenshot shows that the camera is parented to a null. That means that its position is relative to its parent — it cannot be used in a length calculation with an object that is not a sibling. In other words, the camera and the focus control are working in two coordinate systems with different frames of reference.
We must therefore convert the camera’s position to world coordinates:
length(thisComp.activeCamera.toWorld([0,0,0]),thisComp.layer("Focus Control").transform.position)Walter Soyka
Principal & Designer at Keen Live
Motion Graphics, Widescreen Events, Presentation Design, and Consulting
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Thank you very much…. wow, I had no idea the coordinate systems changed depending on parent/child relationships!
My portfolio can be seen at http://www.ruesterprod.com
My personal website is http://www.azaallen.com
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