Implement perlin frequency

main.cpp

@@ -146,7 +146,7 @@ void funny() {
 void perlinSpheres() {
     hittableList world;
 
-    auto perlinTexture = make_shared<noiseTexture>();
+    auto perlinTexture = make_shared<noiseTexture>(4);
     world.add(make_shared<sphere>(point3(0,-1000,0), 1000, make_shared<lambertian>(perlinTexture)));
     world.add(make_shared<sphere>(point3(0,2,0), 2, make_shared<lambertian>(perlinTexture)));
 

texture.h

@@ -77,12 +77,15 @@ class noiseTexture : public texture {
   public:
     noiseTexture() {}
 
+    noiseTexture(double scale) : scale(scale) {}
+
     colour value(double u, double v, const point3& p) const override {
-        return colour(1,1,1) * noise.noise(p);
+        return colour(1,1,1) * noise.noise(scale * p);
     }
 
   private:
     perlin noise;
+    double scale;
 };
 
 #endif