private void PositionParticles()
{
Quaternion q = Quaternion.Euler(surface.rotation);
Quaternion qInv = Quaternion.Inverse(q);
NoiseMethod method = NoiseLibrary.noiseMethods[(int)surface.type][surface.dimensions - 1];
float amplitude = surface.damping ? surface.strength / surface.frequency : surface.strength;
for (int i = 0; i < particles.Length; i++)
{
Vector3 position = particles[i].position;
Vector3 point = q * new Vector3(position.x, position.z) + surface.offset;
NoiseSample sample = NoiseLibrary.Sum(method, point, surface.frequency, surface.octaves, surface.lacunarity, surface.persistence);
sample = surface.type == NoiseMethodType.Value ? (sample - 0.5f) : (sample * 0.5f);
sample *= amplitude;
sample.derivative = qInv * sample.derivative;
Vector3 curl = new Vector3(sample.derivative.y, 0f, -sample.derivative.x);
position += curl * Time.deltaTime * flowStrength;
position.y = sample.value + system.startSize;
particles[i].position = position;
if (position.x < -0.5f || position.x > 0.5f || position.z < -0.5f || position.z > 0.5f)
{
particles[i].remainingLifetime = 0f;
}
}
}
public void FillTexture()
{
if (texture.width != resolution)
{
texture.Resize(resolution, resolution);
}
Vector3 point00 = transform.TransformPoint(new Vector3(-0.5f, -0.5f));
Vector3 point10 = transform.TransformPoint(new Vector3(0.5f, -0.5f));
Vector3 point01 = transform.TransformPoint(new Vector3(-0.5f, 0.5f));
Vector3 point11 = transform.TransformPoint(new Vector3(0.5f, 0.5f));
NoiseMethod method = NoiseLibrary.noiseMethods[(int)type][dimensions - 1];
float stepSize = 1f / resolution;
for (int y = 0; y < resolution; y++)
{
Vector3 point0 = Vector3.Lerp(point00, point01, (y + 0.5f) * stepSize);
Vector3 point1 = Vector3.Lerp(point10, point11, (y + 0.5f) * stepSize);
for (int x = 0; x < resolution; x++)
{
Vector3 point = Vector3.Lerp(point0, point1, (x + 0.5f) * stepSize);
float sample = NoiseLibrary.Sum(method, point, frequency, octaves, lacunarity, persistence).value;
if (type != NoiseMethodType.Value)
{
sample = sample * 0.5f + 0.5f;
}
texture.SetPixel(x, y, coloring.Evaluate(sample));
}
}
texture.Apply();
}
public void Refresh()
{
if (resolution != currentResolution)
{
CreateGrid();
}
Quaternion q = Quaternion.Euler(rotation);
Quaternion qInv = Quaternion.Inverse(q);
Vector3 point00 = q * new Vector3(-0.5f, -0.5f) + offset;
Vector3 point10 = q * new Vector3(0.5f, -0.5f) + offset;
Vector3 point01 = q * new Vector3(-0.5f, 0.5f) + offset;
Vector3 point11 = q * new Vector3(0.5f, 0.5f) + offset;
NoiseMethod method = NoiseLibrary.noiseMethods[(int)type][dimensions - 1];
float stepSize = 1f / resolution;
float amplitude = damping ? strength / frequency : strength;
for (int v = 0, y = 0; y <= resolution; y++)
{
Vector3 point0 = Vector3.Lerp(point00, point01, y * stepSize);
Vector3 point1 = Vector3.Lerp(point10, point11, y * stepSize);
for (int x = 0; x <= resolution; x++, v++)
{
Vector3 point = Vector3.Lerp(point0, point1, x * stepSize);
NoiseSample sample = NoiseLibrary.Sum(method, point, frequency, octaves, lacunarity, persistence);
sample = type == NoiseMethodType.Value ? (sample - 0.5f) : (sample * 0.5f);
if (coloringForStrength)
{
colors[v] = coloring.Evaluate(sample.value + 0.5f);
sample *= amplitude;
}
else
{
sample *= amplitude;
colors[v] = coloring.Evaluate(sample.value + 0.5f);
}
vertices[v].y = sample.value;
sample.derivative = qInv * sample.derivative;
if (analyticalDerivatives)
{
normals[v] = new Vector3(-sample.derivative.x, 1f, -sample.derivative.y).normalized;
}
normals[v] = new Vector3(-sample.derivative.x, 1f, -sample.derivative.y).normalized;
}
}
mesh.vertices = vertices;
mesh.colors = colors;
if (!analyticalDerivatives)
{
CalculateNormals();
}
mesh.normals = normals;
}
private void PositionParticles()
{
morphOffset += Time.deltaTime * morphSpeed;
if (morphOffset > 256f)
{
morphOffset -= 256f;
}
Quaternion q = Quaternion.Euler(rotation);
Quaternion qInv = Quaternion.Inverse(q);
NoiseMethod method = NoiseLibrary.noiseMethods[(int)type][dimensions - 1];
float amplitude = damping ? strength / frequency : strength;
for (int i = 0; i < particles.Length; i++)
{
Vector3 position = particles[i].position;
Vector3 point = q * new Vector3(position.z, position.y, position.x + morphOffset) + offset;
NoiseSample sampleX = NoiseLibrary.Sum(method, point, frequency, octaves, lacunarity, persistence);
sampleX *= amplitude;
sampleX.derivative = qInv * sampleX.derivative;
point = q * new Vector3(position.x + 100f, position.z, position.y + morphOffset) + offset;
NoiseSample sampleY = NoiseLibrary.Sum(method, point, frequency, octaves, lacunarity, persistence);
sampleY *= amplitude;
sampleY.derivative = qInv * sampleY.derivative;
point = q * new Vector3(position.y, position.x + 100f, position.z + morphOffset) + offset;
NoiseSample sampleZ = NoiseLibrary.Sum(method, point, frequency, octaves, lacunarity, persistence);
sampleZ *= amplitude;
sampleZ.derivative = qInv * sampleZ.derivative;
Vector3 curl;
curl.x = sampleZ.derivative.x - sampleY.derivative.y;
curl.y = sampleX.derivative.x - sampleZ.derivative.y + (1f / (1f + position.y));
curl.z = sampleY.derivative.x - sampleX.derivative.y;
particles[i].velocity = curl;
}
}
