CurlNoise

https://gyazo.com/8a5d98a1e24b566c989ba2b7b915a92b

説明

PerlinNoiseを使って流体っぽい動きをするCurlNoiseクラスを作りました。

code:Main.cpp

class CurlNoise

{

private:

PerlinNoise perlin{ RandomUint32() };

const double delta = 0.1;

const double scale = 128.0;

public:

CurlNoise()

{}

Vec2 noise2D(double x, double y, int32 octave = 1)

{

double dx = perlin.normalizedOctave2D((x + delta) / scale, y / scale, octave) -

perlin.normalizedOctave2D((x - delta) / scale, y / scale, octave);

double dy = perlin.normalizedOctave2D(x / scale, (y + delta) / scale, octave) -

perlin.normalizedOctave2D(x / scale, (y - delta) / scale, octave);

return Vec2(dy, -dx) / delta;

}

Vec2 noise2D(Vec2 pos, int32 octave = 1)

{

return noise2D(pos.x, pos.y, octave);

}

};

void Main()

{

Scene::SetBackground(Palette::Black);

CurlNoise curl;

Array<Vec2> particles(300);

for (auto& particle : particles)

{

particle = RandomVec2(Scene::Rect());

}

while (System::Update())

{

for (auto& particle : particles)

{

Vec2 force = curl.noise2D(particle);

particle += force * 10000 * Scene::DeltaTime();

// 画面の範囲内に留める

if (!Scene::Rect().contains(particle))

{

particle = RandomVec2(Scene::Rect());

}

Circle(particle, 2).draw(Palette::White);

}

}

}

作者

たのれん