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Add eased 3d point-value noise functions

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This commit is contained in:
kwolekr 2014-11-12 23:49:45 -05:00
parent 7616537bc0
commit fc9521874c
2 changed files with 24 additions and 12 deletions
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25
src/noise.cpp
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@ -215,7 +215,7 @@ float noise2d_gradient(float x, float y, int seed)
}
float noise3d_gradient(float x, float y, float z, int seed)
float noise3d_gradient(float x, float y, float z, int seed, bool eased)
{
// Calculate the integer coordinates
int x0 = myfloor(x);
@ -235,10 +235,17 @@ float noise3d_gradient(float x, float y, float z, int seed)
float v011 = noise3d(x0, y0 + 1, z0 + 1, seed);
float v111 = noise3d(x0 + 1, y0 + 1, z0 + 1, seed);
// Interpolate
return triLinearInterpolationNoEase(
v000, v100, v010, v110,
v001, v101, v011, v111,
xl, yl, zl);
if (eased) {
return triLinearInterpolation(
v000, v100, v010, v110,
v001, v101, v011, v111,
xl, yl, zl);
} else {
return triLinearInterpolationNoEase(
v000, v100, v010, v110,
v001, v101, v011, v111,
xl, yl, zl);
}
}
@ -275,14 +282,14 @@ float noise2d_perlin_abs(float x, float y, int seed,
float noise3d_perlin(float x, float y, float z, int seed,
int octaves, float persistence)
int octaves, float persistence, bool eased)
{
float a = 0;
float f = 1.0;
float g = 1.0;
for (int i = 0; i < octaves; i++)
{
a += g * noise3d_gradient(x * f, y * f, z * f, seed + i);
a += g * noise3d_gradient(x * f, y * f, z * f, seed + i, eased);
f *= 2.0;
g *= persistence;
}
@ -291,14 +298,14 @@ float noise3d_perlin(float x, float y, float z, int seed,
float noise3d_perlin_abs(float x, float y, float z, int seed,
int octaves, float persistence)
int octaves, float persistence, bool eased)
{
float a = 0;
float f = 1.0;
float g = 1.0;
for (int i = 0; i < octaves; i++)
{
a += g * fabs(noise3d_gradient(x * f, y * f, z * f, seed + i));
a += g * fabs(noise3d_gradient(x * f, y * f, z * f, seed + i, eased));
f *= 2.0;
g *= persistence;
}