sL-method now takes a hit

RayTracer/shape/LightSingleGroup.cpp

@@ -13,8 +13,11 @@ LightSingleGroup::LightSingleGroup(const util::Mat4& matrix,
     : light(light), transform(util::Transformation(matrix)) {
 }
 
-util::SurfacePoint LightSingleGroup::sampleLight() const {
-	auto sample = light->sampleLight();
+util::SurfacePoint LightSingleGroup::sampleLight(const cam::Hit& h) const {
+	cam::Hit xx(transform.fromWorld.transformPoint(h.point()),
+	            transform.fromWorldN.transformDir(h.normal()), h.texel(),
+	            h.scalar(), h.material);
+	auto sample = light->sampleLight(xx);
 	auto result =
 	    util::SurfacePoint(transform.toWorld.transformPoint(sample.point()),
 	                       transform.toWorldN.transformDir(sample.normal()),

RayTracer/shape/LightSingleGroup.h

@@ -11,7 +11,7 @@ class LightSingleGroup : public Light {
 	                 std::shared_ptr<Light> shape);
 	LightSingleGroup(const util::Mat4& matrix, std::shared_ptr<Light> shape);
 
-	util::SurfacePoint sampleLight() const override;
+	util::SurfacePoint sampleLight(const cam::Hit& h) const override;
 	util::Vec3 calculateLightEmission(const util::SurfacePoint& p,
 	                                  const util::Vec3& d) const override;