Random Numbers in Unity3D?

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In Unity C# the method is as follows

Random.Range(minVal, maxVal);

See Unity Documentation – Random

The method will accept either integer or float arguments. If using ints minVal is inclusive and maxVal is exclusive of the returned random value. In your case it would be:

Random.Range(1,4);

Instead of Next(1,4).

If using floats, for example

Random.Range(1.0F, 3.5F);

The return value is also a float, minVal and maxVal are inclusive in this case.

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