camera

Define the viewpoint from which the image will be rendered. 

   <camera name="name" resx="width" resy="height" focal="1.015" >
           <from x="0" y="-10" z="2" />
           <to x="0" y="0" z="2" />
           <up x="0" y="0" z="0" />
   </camera>

resx:
The width of the image, in pixels.

resy:
The height of the image, in pixels.
focal: ???
Distance of focal point from camera.
from: xyz
Position of the camera.
to: xyz
Point the center of the image is pointing to.
up: xyz
Controls the vector of what is "up" in the resulting image. Think of it as a pole extending from the top of your camera. The XYZ values of the "up" field indicate the coordinates of the end of this pole. Wherever this pole points will be the top of the photograph. In practice this is only useful for controlling a rotation of the view. The "to" field of the camera generally overrides tilting up and down.