Added Comments

Added ability to hold shift and skip the terrain generation when loading
Added ability for the perlin terrain to save a raw image of the terrain to use as a cache

Graphics2/PerlinTerrainNode.h

@@ -3,9 +3,11 @@
 #include <vector>
 #include <numeric>
 #include <random>
+#include <fstream>
 #include "SharedMethods.h"
 #include "TerrainNode.h"
 
+// Class for generating a terrain using a perlin noise algorithm, this now caches the result too so it only has to run on the initial time its loaded.
 class PerlinTerrainNode : public TerrainNode
 {
 public:
@@ -41,11 +43,20 @@ private:
   138,236,205,93,222,114,67,29,24,72,243,141,128,195,78,66,215,61,156,180
 	};
 
+	// Vector to hold the actual randomised perlin noise permutation array
 	vector<unsigned char> _p;
 	
+	// The chunk size lets us control how large a noise spot should be, lower numbers will make things flatter, larger numbers will make things spikey
 	float _chunkSize;
 
+	// Methods for Caching the output to a raw image format, and reading it back in the next time its loaded
+	bool ReadCache();
+	void CacheOutput();
+
+	// Methods for fading a number, used for the noise calculation
 	float Fade(float t);
+
+	// Method for generating a perlin gradient.
 	float Grad(int hash, float x, float y);
 
 	void GeneratePerlinValues();