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Description
In listing 29, function noise()
, we first calculate u
, v
and w
from p.x
, p.y
and p.z
but then do nothing with them.
double noise(const point3& p) const {
auto u = p.x() - floor(p.x());
auto v = p.y() - floor(p.y());
auto w = p.z() - floor(p.z());
auto i = static_cast<int>(4*p.x()) & 255;
auto j = static_cast<int>(4*p.y()) & 255;
auto k = static_cast<int>(4*p.z()) & 255;
return ranfloat[perm_x[i] ^ perm_y[j] ^ perm_z[k]];
}