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Fix small bug in samplePerlin #158

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Fix small bug in samplePerlin #158

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4 changes: 2 additions & 2 deletions noise.c
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Original file line number Diff line number Diff line change
Expand Up @@ -107,7 +107,7 @@ void xPerlinInit(PerlinNoise *noise, Xoroshiro *xr)
}

double samplePerlin(const PerlinNoise *noise, double d1, double d2, double d3,
double yamp, double ymin)
double yamp, double ymax)
{
uint8_t h1, h2, h3;
double t1, t2, t3;
Expand Down Expand Up @@ -143,7 +143,7 @@ double samplePerlin(const PerlinNoise *noise, double d1, double d2, double d3,

if (yamp)
{
double yclamp = ymin < d2 ? ymin : d2;
double yclamp = ymax >= 0.0 && ymax < d2 ? ymax : d2;
d2 -= floor(yclamp / yamp) * yamp;
}

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2 changes: 1 addition & 1 deletion noise.h
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Expand Up @@ -49,7 +49,7 @@ void perlinInit(PerlinNoise *noise, uint64_t *seed);
void xPerlinInit(PerlinNoise *noise, Xoroshiro *xr);

double samplePerlin(const PerlinNoise *noise, double x, double y, double z,
double yamp, double ymin);
double yamp, double ymax);
double sampleSimplex2D(const PerlinNoise *noise, double x, double y);

/// Perlin Octaves
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