On 05/16/2011 05:03 AM, Marco wrote:
> Oh and te image could perhaps be updated to show z+ and z- as well asl x+ and x-
> and y+ and y-. Those are all rather intuitive to me, but the z could (according
> to my intuition) swing either way.

you're not thinking 3D here ... isn't -z 180 degrees from +z

i usually set up camera with a location vector of -z so that a rotate of 
+x moves the camera up (-x moves it down) and +y moves it clockwise (-y 
counterclockwise) ... two separate transforms:

#declare CamPos = <0,0,-10>;
#declare LookAt = <0,0,0>;

camera {
   perspective
   location CamPos
   rotate x*2
   rotate y*-10
   look_at  LookAt
   }

this example 2 degrees up and 10 degrees counterclockwise

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