18.104.22.168 Adding a Camera
camera statement describes where and how the camera sees the scene. It gives x-, y- and
z-coordinates to indicate the position of the camera and what part of the scene it is pointing at. We describe the
coordinates using a three-part vector. A vector is specified by putting three numeric values between a pair
of angle brackets and separating the values with commas. We add the following camera statement to the scene.
location <0, 2, -3>
look_at <0, 1, 2>
location <0,2,-3> places the camera up two units and back three units from the center
of the ray-tracing universe which is at <0,0,0>. By default +z is into the screen and -z is back out of the
look_at <0,1,2> rotates the camera to point at the coordinates <0,1,2>. A point 1
unit up from the origin and 2 units away from the origin. This makes it 5 units in front of and 1 unit lower than the
look_at point should be the center of attention of our image.