4. Radiosity lighting

- Needed: MegaPOV (http://megapov.inetart.net).

With radiosity lighting, we place a huge lit sphere around the model, so that 
light comes from all around, instead of just a few unnatural looking lights. 
Delete any lights that are currently in the .pov-file, or your render will 
look much too bright, and then just put the following lines in at the start 
of your .pov-file:

	#version unofficial MegaPov 1.10;

	#declare LDRAW_RAD_LEVEL = 5;
	#declare LDRAW_MTL = 10;
	#declare INDEXOFREFRACTION=1.52;
	#declare LDRAW_RAD_NORMAL = off;
	#declare LDRAW_RAD_MEDIA = off;

	#include "rad_def.inc"
	global_settings {
	  assumed_gamma 1.4
	  max_trace_level LDRAW_MTL
	  adc_bailout 0.01/2
	  radiosity {
	    Rad_Settings(LDRAW_RAD_LEVEL, LDRAW_RAD_NORMAL, LDRAW_RAD_MEDIA)
	  }
	}

	sky_sphere {
	  pigment {
	    gradient -y
	    color_map {
	      [ 1 rgb 1 ]
	    }
	  }
	}

Do play around with the settings. This is what the render looks like now: 
<tutorial_chapter04a.png>

* In the standard .pov-file that L3P creates, all parts have an ambient and 
  diffuse value of .4. This means that a part will emit a bit of light, even 
  when there's no light hitting the part. When rendering using radiosity, all 
  parts automatically get an ambient value of 0, and a diffuse of 1. This makes 
  it look much more realistic. Be sure to change the amb and dif values of the 
  floor, though, since this won't change automatically!

It's pretty nice, but still looks steril. Check out the chrome parts; they don't
have anything interesting to reflect.  That's because the whole skysphere is 
just evenly white. You could play around with its settings to break it up a bit,
or you could move on to...