LookAt Cameras Plane vs Position

Questions
1

What would be a way to have the LookAt method look at a position on the cameras view plane (just like a billboard) instead of its position?

Im assuming, you take the cameras inverse forward ray, then project that ray onto the view plane from the entity you want to use the LookAt on, get the point on the plane and then use that as the position for the lookAt?

2

Got it never mind!

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3

You can do it more easily by simply copying the camera quaternion to your object quaternions:

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