Light now has a function that determines the amount of light emitted by the Light in direction d

RayTracer/shape/Light.h

@@ -5,5 +5,7 @@ namespace shapes {
 class Light {
    public:
 	virtual util::SurfacePoint sampleLight() const = 0;
+	virtual util::Vec3 calculateLightEmission(const util::SurfacePoint& p,
+	                                          const util::Vec3& d) const = 0;
 };
 }  // namespace shapes
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