1、The near and far clipping planes are parallel to the camera's XY plane and each set at a certain distance along its centre line.
2、The back clipping plane determines the cutoff point for rendering polygons. Here we're setting it to 5000. This value will vary depending on your coordinate system.
3、Notice that the aspect ratio and the values for the clipping planes are float values.
4、Unlike the real world, 3d computing gives you two more view boundaries: near and far clipping planes.
