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rayTracer.h

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+#ifndef RAYTRACER_H
+#define RAYTRACER_H
+
+#include <cmath>
+#include <cstdlib>
+#include <iostream>
+#include <limits>
+#include <memory>
+//#include <random>
+
+// C++ std usings. 
+using std::fabs;
+using std::make_shared;
+using std::shared_ptr;
+using std::sqrt;
+
+// Constants. 
+const double infinity = std::numeric_limits<double>::infinity();
+const double pi = 3.1415926535897932385;
+
+// Utility Functions. 
+inline double degreesToRadians(double degrees) {
+    return degrees * pi / 180.0;
+}
+
+inline double randomDouble(void) {
+    // Returns a random real in [0, 1). 
+    return rand() / (RAND_MAX + 1.0);
+}
+
+// The same as randomDouble() but using the random include. 
+// inline double randomDouble(void) {
+//     static std::uniform_real_distribution<double> distribution(0.0, 1.0);
+//     static std::mt19937 generator;
+//     return distribution(generator);
+// }
+
+inline double randomDouble(double min, double max) {
+    // Returns a random real in [min, max).
+    return min + (max - min) * randomDouble();
+}
+
+// Common headers. 
+#include "colour.h"
+#include "interval.h"
+#include "ray.h"
+#include "vec3.h"
+
+#endif