rayleigh: drop fogFactor

data/shaders/opengl/rayleigh_sky.frag

@@ -205,15 +205,11 @@ void main(void)
 	vec3 specularHighlight = vec3(0.0);
 
 	sphereEntryExitDist(skyNear, skyFar, geosphereCenter, varyingEyepos.xyz, geosphereRadius * geosphereAtmosTopRad);
-	float atmosDist = (skyFar - skyNear);
-	float ldprod=0.0;
 
 	// a&b scaled so length of 1.0 means planet surface.
 	vec3 a = (skyNear * eyenorm - geosphereCenter) * geosphereInvRadius;
 	vec3 b = (skyFar * eyenorm - geosphereCenter) * geosphereInvRadius;
-	ldprod = AtmosLengthDensityProduct(a, b, atmosColor.a * geosphereAtmosFogDensity, atmosDist, geosphereAtmosInvScaleHeight);
 
-	float fogFactor = 1.0 / exp(ldprod);
 	vec4 atmosDiffuse = vec4(0.0);
 
 #if (NUM_LIGHTS > 0)
@@ -232,7 +228,7 @@ void main(void)
 #endif
 
 	atmosDiffuse.a = 1.0;
-	frag_color = (1.0-fogFactor) * (atmosDiffuse *
+	frag_color = (atmosDiffuse *
 		vec4(specularHighlight.rgb, 1.0) * 20
 		);
 }