Small fix and better doc for Lighting

src/pe/raytracing/Lighting.h

@@ -28,6 +28,8 @@
 namespace walberla {
 namespace pe {
 namespace raytracing {
+/*!\brief The Lighting struct defines the properties of a point light in the scene.
+ */
 struct Lighting {
    Vec3 pointLightOrigin;
    Color diffuseColor;
@@ -42,9 +44,9 @@ struct Lighting {
    
    /*!\brief Instantiation constructor for the Lighting struct.
     * \param pointLightOrigin Origin of the point light.
-    * \param diffuseColor Diffuse color.
-    * \param specularColor Specular color.
-    * \param ambientColor Color of the ambient light.
+    * \param diffuseColor Diffuse color (base color of the light).
+    * \param specularColor Specular color (color of light refractions on an objects surface).
+    * \param ambientColor Color of the ambient light in the scene.
     */
    Lighting (const Vec3& _pointLightOrigin,
              const Color& _diffuseColor, const Color& _specularColor, const Color& _ambientColor)

src/pe/raytracing/ShadingFunctions.h

@@ -39,6 +39,7 @@ inline ShadingParameters lightGreyShadingParams (const BodyID body);
 inline ShadingParameters greyShadingParams (const BodyID body);
 inline ShadingParameters darkGreyShadingParams (const BodyID body);
 inline ShadingParameters redShadingParams (const BodyID body);
+inline ShadingParameters greenShadingParams (const BodyID body);
 inline ShadingParameters blueShadingParams (const BodyID body);
 inline ShadingParameters violetShadingParams (const BodyID body);