Add random number utility functions

1 files changed, 10 insertions, 0 deletions

diff --git a/include/rt.hpp b/include/rt.hpp
index 60170ac..3c37fa1 100644
--- a/include/rt.hpp
+++ b/include/rt.hpp
@@ -2,6 +2,7 @@
 #define __RT_HPP_
 
 #include <limits>
+#include <cstdlib>
 
 const double pi = 3.1415926535897932385;
 const double infinity = std::numeric_limits<double>::infinity();
@@ -10,6 +11,15 @@ inline double deg_to_rad(double deg) {
     return deg * pi / 180.0;
 }
 
+inline double randd() {
+    return rand() / (RAND_MAX + 1.0);
+}
+
+inline double randd(double min, double max) {
+    return min + randd() * (max - min);
+}
+
+
 #include "vec3.hpp"
 #include "ray.hpp"
 #include "color.hpp"