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| author | kwolekr <kwolekr@minetest.net> | 2015-04-27 04:05:25 -0400 |
|---|---|---|
| committer | kwolekr <kwolekr@minetest.net> | 2015-04-27 04:05:25 -0400 |
| commit | 415167b228dea8b4108d7fe164c7fec8c061dcf5 (patch) | |
| tree | 47f147beffc37d4d08c341f50825ce9edc1e6b17 | |
| parent | cd1d625ab21e741e91be7d2190bb4fd59fab3200 (diff) | |
| download | minetest-415167b228dea8b4108d7fe164c7fec8c061dcf5.tar.gz minetest-415167b228dea8b4108d7fe164c7fec8c061dcf5.tar.bz2 minetest-415167b228dea8b4108d7fe164c7fec8c061dcf5.zip | |
Noise: Fix PcgRandom::randNormalDist() when range contains negative numbers
This fixes an issue with erroneous float-to-int rounding that resulted in
truncation toward 0, causing a biased distribution.
| -rw-r--r-- | src/noise.cpp | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/src/noise.cpp b/src/noise.cpp index 2e4588124..614234aa4 100644 --- a/src/noise.cpp +++ b/src/noise.cpp @@ -148,7 +148,7 @@ s32 PcgRandom::randNormalDist(s32 min, s32 max, int num_trials) s32 accum = 0; for (int i = 0; i != num_trials; i++) accum += range(min, max); - return ((float)accum / num_trials) + 0.5f; + return round((float)accum / num_trials); } /////////////////////////////////////////////////////////////////////////////// |