Add travis command to install ImageMagick on Mac OS X VMs

tests/uvmap_skybox.cpp

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+/*
+ *  DoRayMe - a quick and dirty Raytracer
+ *  Skybox test for bonus chapter UV Mapping
+ *
+ *  Created by Manoël Trapier
+ *  Copyright (c) 2020 986-Studio.
+ *
+ */
+#include <world.h>
+#include <light.h>
+#include <sphere.h>
+#include <plane.h>
+#include <cube.h>
+#include <cylinder.h>
+
+#include <material.h>
+#include <colour.h>
+#include <canvas.h>
+#include <camera.h>
+
+#include <pattern.h>
+#include <texturemap.h>
+#include <uv_image.h>
+
+#include <transformation.h>
+
+int main()
+{
+    World w = World();
+
+    Light light = Light(POINT_LIGHT, Point(0, 100, 0), Colour(1, 1, 1));
+    w.addLight(&light);
+
+    Sphere sp = Sphere();;
+    sp.setTransform(translation(0, 0, 5) * scaling(0.75, 0.75, 0.75));
+    sp.material.diffuse = 0.4;
+    sp.material.specular = 0.6;
+    sp.material.shininess = 20;
+    sp.material.reflective = 0.6;
+    sp.material.ambient = 0;
+    w.addObject(&sp);
+
+    UVImage left = UVImage("negx.jpg");
+    UVImage right = UVImage("posx.jpg");
+    UVImage front = UVImage("posz.jpg");
+    UVImage back = UVImage("negz.jpg");
+    UVImage up = UVImage("posy.jpg");
+    UVImage down = UVImage("negy.jpg");
+
+    Cube cb = Cube();
+    TextureMap tm = TextureMap(CUBIC_MAP, nullptr);
+    tm.setCubePattern(&front, &left, &right, &back, &up, &down);
+    cb.material.pattern = &tm;
+    cb.material.diffuse = 0;
+    cb.material.specular = 0;
+    cb.material.ambient = 1;
+    cb.setTransform(scaling(1000, 1000, 1000));
+    w.addObject(&cb);
+
+    /* Set the camera */
+    Camera camera = Camera(800, 400, 1.2);
+    camera.setTransform(viewTransform(Point(0, 0, 0),
+                                      Point(0, 0, 5),
+                                      Vector(0, 1, 0)));
+
+    /* Now render it */
+    Canvas image = camera.render(w);
+
+    image.SaveAsPNG("uvmap_skybox.png");
+
+    return 0;
+}