Merge pull request #7 from Dozed12/patch-1

Longitude Optimization

Author: jongallant

Assets/Scripts/SphericalWorldGenerator.cs

@@ -168,10 +168,16 @@ protected override void GetData()
 	// Convert Lat/Long coordinates to x/y/z for spherical mapping
 	void LatLonToXYZ(float lat, float lon, ref float x, ref float y, ref float z)
 	{
-		float r = Mathf.Cos (Mathf.Deg2Rad * lon);
-		x = r * Mathf.Cos (Mathf.Deg2Rad * lat);
-		y = Mathf.Sin (Mathf.Deg2Rad * lon);
-		z = r * Mathf.Sin (Mathf.Deg2Rad * lat);
+		float r = Mathf.Cos(Mathf.Deg2Rad * lon);
+
+		//Longitude Optimization
+		float sin = Mathf.Sqrt(1 * 1 - r * r);
+		if (lon < 0)
+		    sin = -sin;
+
+		x = r * Mathf.Cos(Mathf.Deg2Rad * lat);
+		y = sin;
+		z = r * Mathf.Sin(Mathf.Deg2Rad * lat);
 	}
 
 	protected override Tile GetTop(Tile t)