Remove extraneous normalization

Author: 375gnu

src/celengine/shadermanager.cpp

@@ -2319,14 +2319,13 @@ ShaderManager::buildAtmosphereFragmentShader(const ShaderProperties& props)
 
     // Sum the contributions from each light source
     source += "vec3 color = vec3(0.0);\n";
-    source += "vec3 V = normalize(eyeDir);\n";
 
     // Only do scattering calculations for the primary light source
     // TODO: Eventually handle multiple light sources, and removed the 'min'
     // from the line below.
     for (unsigned i = 0; i < std::min(static_cast<unsigned int>(props.nLights), 1u); i++)
     {
-        source += "    float cosTheta = dot(V, " + LightProperty(i, "direction") + ");\n";
+        source += "    float cosTheta = dot(eyeDir, " + LightProperty(i, "direction") + ");\n";
         source += ScatteringPhaseFunctions(props);
 
         // TODO: Consider premultiplying by invScatterCoeffSum