Mathematics for programming graphical representation of a carousel?

[pluviosilla]

I would like to program a 3D representation of a carousel of photo images. Anyone know where I can find the mathematical formulas for that? The carousel is rotating about a central axis, obviously, but you also have to make each individual photo (or slide) rotate about its axis in a way that is dependent on the rotation of the carousel.

Picture of a classic slide carousel:

http://images.google.com/imgres?imgu...%3Den%26sa%3DN

Any help would be appreciated. Thanks.

[Amleto]

If I understand you correctly, the rotation of the photo is just its starting rotation, plus the rotation of the carousel.

if the first photo (n=0) is defined so that it has 0 starting rotation, then the nth photo of N photos has starting rotation (in degrees) of

(360/N) * (n - 1).

e.g. you want 5 photos

360/5 = 72 degrees. The starting rotation of the photos are as follows:

n	rotation
0	0
1	72
2	144
3	216
4	288