I want to illustrate some elements about perspective. So I made a model 
of a room and also of a tower. I don't have any problems to reproduce 
one point and two point perspective. 
Now I want to illustrate three point perspective using the tower and 
reproducing the effect of rotating a photographic camera slightly as to 
get the image of the whole tower on the picture. 
I found the possibility to rotate the camera (ex. around the X-axis), 
but the result isn't what I think it should be. What about the 
combination of rotating the camera and the "look_at" and "direction" 
directives? Does it have any sense to rotate a camera and to maintain 
this two elements?

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