Colour Interpolation

colourInterpolation.cs

Vector3 position = GetPoint();
position.Y -= heightMagnitude * Math.Sin(position.Magnitude * heightFrequency);

// Colour each point based on their global angle around the axis
Color blendedColour;
var angle = Math.Atan2(position.X, position.Z);

// c1, c2, c3 and c4 are random colours generated at the start of the program
// Blend the colours of adjacent quadrants together
if (angle < -Math.PI / 2)
    blendedColour = Color.Interpolate(c1, c2, (angle + Math.PI) / (Math.PI / 2));
else if (angle < 0)
    blendedColour = Color.Interpolate(c2, c3, (Math.PI / 2 + angle) / (Math.PI / 2));
else if (angle < Math.PI / 2)
    blendedColour = Color.Interpolate(c3, c4, angle / (Math.PI / 2));
else
    blendedColour = Color.Interpolate(c4, c1, (angle - Math.PI / 2) / (Math.PI / 2));

// maxMagnitude stores the distance of the furthest known point
if (position.Magnitude / maxMagnitude > 1)
    maxMagnitude = position.Magnitude;

// Colours get brighter the closer they are to the center
uint pointColour = Color.Interpolate(Color.Black, Color.Interpolate(Color.White, blendedColour, position.Magnitude / maxMagnitude), 0.8).Value;