single axis aim constraints

david | tutorials | Tuesday, December 9th, 2008

You can use an aim constraint to make one object face another, but what if you also want that object to only pivot around a single axis. An example of when you might want this behavior is a candle flame made of a simple texture mapped plane. To create the illusion of a 3d flame you need it to face the camera, but you only want it to rotate around its y-axis so that the flame stays vertical even if the camera moves up higher than the candle.

To do this you could simply make an aim constraint and select only the y-axis to constrain, but you would discover that it doesnt work they way you might expect.

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