// Last edited on 2007-05-23 08:47:39 by stolfi

// Generic camera declarations

#local asp = image_width/image_height;
#local rad = scene_rad/vlength(camera_pos - camera_ctr);

camera { 
  location camera_pos
  right   -2.0*rad*sqrt(asp)*x
  up       2.0*rad/sqrt(asp)*y 
  sky z
  look_at camera_ctr
}