Ambientlight implemented

.gitignore

@@ -11,6 +11,7 @@ build/
 !/data/parallax
 !/data/fractal.obj
 /result*
+/cmake-build-debug
 
 # Latex stuff
 *.aux

CMakeLists.txt

@@ -25,7 +25,7 @@ file(GLOB shader_src "shader/*.cpp")
 
 # The tracey library
 add_library(tracey STATIC ${common_src} ${camera_src} ${light_src}
-        ${primitive_src} ${renderer_src} ${scene_src} ${shader_src})
+        ${primitive_src} ${renderer_src} ${scene_src} ${shader_src} light/ambientlight.cpp light/ambientlight.h)
 if(NOT WIN32)
     target_link_libraries(tracey ${CMAKE_THREAD_LIBS_INIT} ${X11_LIBRARIES})
 endif()

light/ambientlight.cpp

@@ -0,0 +1,32 @@
+//
+// Created by marcel on 21.11.22.
+//
+
+#include "light/ambientlight.h"
+#include "scene/scene.h"
+
+AmbientLight::AmbientLight(float intensity, const Color &color) : Light(intensity, color) {}
+
+Light::Illumination AmbientLight::illuminate(Scene const &scene, Ray const &ray) const {
+    Vector3d const target = ray.origin + (ray.length - LGT_EPS) * ray.direction;
+
+    Illumination illum;
+    illum.direction = -ray.normal;
+
+    // Precompute the distance from the light source
+    float const distance = length(ray.normal);
+
+
+    // Define a secondary ray from the surface point to the light source.
+    Ray lightRay;
+    lightRay.origin = target;
+    lightRay.direction = -illum.direction;
+    lightRay.length = distance - LGT_EPS;
+
+    // If the target is not in shadow...
+    if (!scene.findOcclusion(lightRay))
+        // ... compute the attenuation and light color
+        illum.color = 1.0f / (distance * distance) * this->color * this->intensity;
+    return illum;
+    return illum;
+}

light/ambientlight.h

@@ -0,0 +1,22 @@
+//
+// Created by marcel on 21.11.22.
+//
+
+#ifndef CG1_TRACER_AMBIENTLIGHT_H
+#define CG1_TRACER_AMBIENTLIGHT_H
+
+#include "light/light.h"
+
+class AmbientLight : public Light{
+
+public:
+    AmbientLight(float intensity, Color const &color = Color(1, 1, 1));
+
+    Illumination illuminate(Scene const &scene, Ray const &ray) const override;
+
+protected:
+    Vector3d direction;
+};
+
+
+#endif //CG1_TRACER_AMBIENTLIGHT_H