Home/ Questions/Q 7435525
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-29T10:05:21+00:00

I’m using libnoise to generate Perlin noise on a 1024×1024 terrain grid. I want

  • 0

I’m using libnoise to generate Perlin noise on a 1024×1024 terrain grid. I want to convert its float output to a BYTE between 0 and 255. The question is ultimately a math one: how can I convert a value in the real interval (-1,1) to the integer one (0,255) minimizing loss?

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    This formula will give you a number in [0, 255] if your input range excludes the endpoints:

    (int)((x + 1.0) * (256.0 / 2.0))

    If you are including the endpoints (and then it usually written [-1,1] rather than (-1,1)) you will need a special case for x == 1.0 to round that down to 255.

    • 0