public override void _Ready()
{
// Gradient
var gradient = new Gradient();
gradient.SetColor(0, TrailColor.WithAlpha(0));
gradient.AddPoint(1, TrailColor);
gradient.SetOffset(0, 0);
gradient.SetOffset(1, 1);
Gradient = gradient;
}
public override void _Ready()
{
_world = (World)GetNode("/root/World");
_light = (Light2D)GetNode("Light2D");
var mat = (ParticlesMaterial)ProcessMaterial;
_sound = (AudioStreamPlayer)FindNode("ExtinguishSound");
var gradient = new Gradient();
gradient.AddPoint(2048 * 0.0f, new Color(255, 0, 0));
gradient.AddPoint(2048 * 0.2f, new Color(255, 90, 0));
gradient.AddPoint(2048 * 0.4f, new Color(255, 109, 0));
gradient.AddPoint(2048 * 0.6f, new Color(255, 154, 0));
gradient.AddPoint(2048 * 0.8f, new Color(255, 206, 0));
gradient.AddPoint(2048 * 1.0f, new Color(255, 226, 6));
var gradientTex = new GradientTexture();
gradientTex.SetGradient(gradient);
gradientTex.SetWidth(2048);
var scale = new Curve();
scale.AddPoint(new Vector2(0.0f, 1.0f));
scale.AddPoint(new Vector2(1.0f, 0.5f));
var scaleTex = new CurveTexture();
scaleTex.SetCurve(scale);
var matCopy = new ParticlesMaterial()
{
EmissionShape = ParticlesMaterial.EMISSION_SHAPE_SPHERE,
EmissionSphereRadius = 10,
FlagDisableZ = true,
Spread = 180,
Gravity = new Vector3(0, -98, 0),
InitialVelocity = 2,
InitialVelocityRandom = 1,
AngularVelocity = 10,
RadialAccel = -15,
Scale = 3,
ColorRamp = gradientTex,
ScaleCurve = scaleTex
};
this.ProcessMaterial = matCopy;
}
public void PlaceCubes(float[] freqMagnitudesLeft, float[] freqMagnitudesRight, double sampleRate)
{
double halfSampleRate = sampleRate / 2.0;
var halfLen = freqMagnitudesLeft.Length / 2;
for (int channel = 0; channel < 2; channel++)
{
var cubeCount = 50;
var cubeTotalWidth = 20;
var cubeTotalHeight = 2;
var L = channel == 0;
var pointBlocks = new Dictionary <int, List <Vector2> >(halfLen);
for (int block = 0; block < cubeCount; block++)
{
pointBlocks[block] = new List <Vector2>();
}
var meshInstance = GetNode <MultiMeshInstance>($"Mesh{(L ? "L" : "R")}");
gradient.SetColors(new Color[0]);
gradient.SetOffsets(new float[0]);
//Determine the FFT points in log space
for (int i = 0; i < halfLen; i++)
{
float progress = i / (float)halfLen;
float x = (float)Math.Log10(progress * halfSampleRate) / (float)Math.Log10(halfSampleRate);
if (i == 0)
{
x = 0;
}
float v = (L ? freqMagnitudesLeft : freqMagnitudesRight)[i];
float y = (float)(Math.Log10(10 * v + 1) / Math.Log10(10));
int block = (int)(x * cubeCount);
pointBlocks[block].Add(new Vector2(x, y));
gradient.AddPoint(x, new Color(y, 0, 0, 1));
}
//Fill the blocks by taking maxima over the point buckets
var blockVectors = new Vector3[cubeCount];
for (int block = 0; block < cubeCount; block++)
{
var points = pointBlocks[block];
var amplitude = 0f;
if (points.Count > 0)
{
amplitude = points.Max(v => v.y);
}
else //If no FFT entries landed in this bucket, interpolate from neighbors
{
float fraction = (block + 0.5f) / cubeCount; //Sample at halfway through the cube
amplitude = gradient.Interpolate(fraction).r;
}
blockVectors[block] = new Vector3((block - cubeCount / 2f) / cubeCount * cubeTotalWidth, amplitude, 0);
}
meshInstance.Multimesh.InstanceCount = cubeCount;
//The Transform is spread over 4 entries: basis.x, basis.y, basis.z, origin
//See https://github.com/godotengine/godot/blob/53070437514e448c87f6cb31cf5b27a3839dbfa1/scene/resources/multimesh.cpp#L34
List <Vector3> ManifyVectors(Vector3 v)
{
return(new List <Vector3> //basis.x, basis.y, basis.z, origin
{
new Vector3(1, 0, 0) / cubeCount / 2 * cubeTotalWidth * 0.75f, //width
new Vector3(0, 1, 0) * v.y * cubeTotalHeight / 2.0f, //height
new Vector3(0, 0, 1) * 0.1f, //thickness of the block
v *Vector3.Right
});
}
meshInstance.Multimesh.TransformArray = blockVectors.SelectMany(ManifyVectors).ToArray();
//Color the cubes along a rainbow, with its value corresponding to its intensity
meshInstance.Multimesh.ColorArray = Enumerable.Range(0, cubeCount)
.Select(v => Color.FromHsv(v / (float)cubeCount / 2, 0.8f, blockVectors[v].y, 1f)).ToArray();
}
}