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>
}