CGTalk - Camera Properties to User Data

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akport

12-29-2006, 02:53 PM

I have built a JibRig for a camera. I'd like to add the camera focal length, aperature width and field of view properties to the User Data field of the parent null. I could rig these individually but don't know how to maintain the relationships between FOV and focal length and aperture width. Any help is much appreciated.

- Adam

tcastudios

12-29-2006, 04:26 PM

The "formula" to extract from could be:

Actual FOV = apert/(2*tan(fov/2))

A fixed aperture of 56 will make UserData and endresult correspond.
Since we are talking "pinhole camera" it usually works fine.

Cheers
Lennart

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