camera {
        location<x,y,z> 
        angle float 
        perspective | orthographic | fisheye | ultra_wide_angle | omnimax | panoramic | cylinder 1|2|3|4 
        aperture float 
        blur_sampes integer 
        focal_point <x,y,z> 
        confidence 1/128
        variance 0.9
        normal { pattern float }
        look_at  <x,y,z>
        }