Documentation correction

http://docs.unity3d.com/ScriptReference/Mathf.PerlinNoise.html

It is said to return a value between 0 and 1 while I found that they return values larger than 1.
The largest value I have seen is 1.0123.



This is my code. zFrequency and xFrequency are both 40.

Code (CSharp):

1. void GenerateAlphaMap()
2.     {
3.         float[, ,] maps = terrain.terrainData.GetAlphamaps(0, 0, terrain.terrainData.alphamapWidth, terrain.terrainData.alphamapHeight);
4.         for (int y = 0; y < terrain.terrainData.alphamapHeight; y++)
5.         {
6.             for (int x = 0; x < terrain.terrainData.alphamapWidth; x++)
7.             {
8.                 float perlinValue = Mathf.PerlinNoise(x / zFrequency, y / xFrequency);
9.  
10.                 if (perlinValue > 1)
11.                 {
12.                     Debug.Log(perlinValue + " at " + x + ", " + y);
13.                 }
14.             }
15.         }
16.     }

 

Hi @revolute, thanks for your feedback. However sounds more like a bug in the API, rather than in the documentation, if it can return values above 1. For now I assume you just ignore values higher that 1 (using Max() or similar methods)?

I will suggest that you report this as a bug using Help -> Report a Bug in Unity including a good repro case. (don't know if the one above can be sent to us)

Best regards, Rasmus