Refraction seems to work. Still need to do a nice scene.

tests/ch11_refractiontest.cpp

@@ -0,0 +1,76 @@
+/*
+ *  DoRayMe - a quick and dirty Raytracer
+ *  Render test for reflection in chapter 11.
+ *
+ *  Created by Manoël Trapier
+ *  Copyright (c) 2020 986-Studio.
+ *
+ */
+#include <world.h>
+#include <light.h>
+#include <sphere.h>
+#include <plane.h>
+#include <material.h>
+#include <colour.h>
+#include <canvas.h>
+#include <camera.h>
+
+#include <pattern.h>
+#include <strippattern.h>
+#include <gradientpattern.h>
+#include <checkerspattern.h>
+#include <ringpattern.h>
+
+#include <transformation.h>
+
+int main()
+{
+    World w = World();
+
+    /* First we need to construct the world */
+    Plane floor = Plane();
+    floor.material.specular = 0;
+    floor.material.pattern = new CheckersPattern(Colour(1, 1, 1), Colour(0, 0, 0));
+    floor.material.pattern->setTransform(scaling(0.7, 0.7, 0.7));
+    floor.setTransform(translation(0, -3, 0));
+    w.addObject(&floor);
+
+    /* Add some more reflective spheres */
+    Sphere glassBall = Sphere();
+    glassBall.setTransform(scaling(1.5, 1.5, 1.5));
+    glassBall.material.refractiveIndex = 1.5;
+    glassBall.material.transparency = 1.0;
+    w.addObject(&glassBall);
+
+    Sphere airBubble = Sphere();
+    airBubble.setTransform( scaling(0.9, 0.9, 0.9));
+    airBubble.material.specular = 0;
+    airBubble.material.ambient = 0;
+    airBubble.material.refractiveIndex = 1.00029;
+    airBubble.material.transparency = 1.0;
+    w.addObject(&airBubble);
+
+    /* Add light */
+    Light light = Light(POINT_LIGHT, Point(-10, 20, -10), Colour(1, 1, 1));
+
+    w.addLight(&light);
+
+    /* Set the camera */
+    Camera camera = Camera(1000, 1000, M_PI / 3);
+#if 0
+    camera.setTransform(viewTransform(Point(0, 1.5, -5),
+                                      Point(0, 1, 0),
+                                      Vector(0, 1, 0)));
+#else
+    camera.setTransform(viewTransform(Point(0, 3.6, 0),
+                                      Point(0, 0, 0),
+                                      Vector(0, 0, 1)));
+#endif
+    /* Now render it */
+    Canvas image = camera.render(w);
+
+    image.SaveAsPNG("ch11_refractiontest.png");
+
+
+    return 0;
+}