CVS: data/Shaders urban.frag,1.3,1.4

Update of /var/cvs/FlightGear-0.9/data/Shaders
In directory baron.flightgear.org:/tmp/cvs-serv21497

Modified Files:
	urban.frag 
Log Message:
Night lighting improvement suggested by Erik Hofman

Index: urban.frag
===================================================================
RCS file: /var/cvs/FlightGear-0.9/data/Shaders/urban.frag,v
retrieving revision 1.3
retrieving revision 1.4
diff -u -r1.3 -r1.4
--- urban.frag	23 Mar 2010 22:20:24 -0000	1.3
+++ urban.frag	28 Mar 2010 16:54:26 -0000	1.4
@@ -92,6 +92,8 @@
 	if ( shadow_factor < 1.0 )
 		ambient_light = constantColor + gl_LightSource[0].diffuse * shadow_factor * vec4(diffuse, 1.0);
 	float emission_factor = (1.0 - smoothstep(0.15, 0.25, reflectance)) * emis;
+	vec4 tc = texture2D(BaseTex, uv);
+	emission_factor *= 0.5*pow(tc.r+0.8*tc.g+0.2*tc.b, 2) -0.2;
 	ambient_light += (emission_factor * vec4(0.75, 0.59, 0.05, 0.0));
 
 	vec4 finalColor = texture2D(BaseTex, uv) * ambient_light;


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