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Fix box muller transform in common/math.cpp.

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Random numbers have to be in (0:1], not in [0:1).
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vrld
2013-02-26 10:37:42 +01:00
parent 03518d51ac
commit d842c5d28d
1 changed files with 2 additions and 2 deletions
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src/common/math.cpp
+2 -2
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@@ -24,8 +24,8 @@ float random_normal(float o)
} }
// else: generate numbers using the Box-Muller transform // else: generate numbers using the Box-Muller transform
float a = sqrt(-2.0f * log(random())); float a = sqrt(-2.0f * log(1. - random()));
float b = float(LOVE_M_PI) * 2.0f * random(); float b = float(LOVE_M_PI) * 2.0f * (1. - random());
last_randnormal = a * cos(b); last_randnormal = a * cos(b);
return a * sin(b) * o; return a * sin(b) * o;
} }