private void WritePixel(float u, float v, int x, int y)
{
var noise = u * NoisePoints;
var noiseIndex = (int)noise;
var noiseFrac = noise % 1.0f;
var noiseA = noisePoints[(noiseIndex + 0) % NoisePoints];
var noiseB = noisePoints[(noiseIndex + 1) % NoisePoints];
var noiseC = noisePoints[(noiseIndex + 2) % NoisePoints];
var noiseD = noisePoints[(noiseIndex + 3) % NoisePoints];
var color = MiddleColor;
if (v < MiddlePoint)
{
color.a = SgtEase.Evaluate(BottomEase, SgtHelper.Sharpness(Mathf.InverseLerp(0.0f, MiddlePoint, v), BottomSharpness));
}
else
{
color.a = SgtEase.Evaluate(TopEase, SgtHelper.Sharpness(Mathf.InverseLerp(1.0f, MiddlePoint, v), TopSharpness));
}
var middle = SgtEase.Evaluate(MiddleEase, SgtHelper.Sharpness(1.0f - v, MiddleSharpness));
color.a *= SgtHelper.HermiteInterpolate(noiseA, noiseB, noiseC, noiseD, noiseFrac);
color.r *= middle * color.a;
color.g *= middle * color.a;
color.b *= middle * color.a;
color.a *= 1.0f - middle;
generatedTexture.SetPixel(x, y, color);
}
private void AddPath(ref Mesh mesh, ref int meshCount, ref int vertexCount)
{
var pathLength = Random.Range(PathLengthMin, PathLengthMax);
var lineCount = 2 + (int)(pathLength * PathDetail);
var quadCount = lineCount - 1;
var vertices = quadCount * 2 + 2;
if (vertexCount + vertices > 65000)
{
BakeMesh(mesh);
mesh = GetMesh(meshCount);
meshCount += 1;
vertexCount = 0;
}
var angle = Random.Range(-Mathf.PI, Mathf.PI);
var speed = 1.0f / PointDetail;
var detailStep = 1.0f / PathDetail;
var pointStep = detailStep * PointDetail;
var pointFrac = 0.0f;
var pointA = GetStart(angle + Mathf.PI);
var pointB = GetNext(pointA, angle, speed);
var pointC = GetNext(pointB, angle, speed);
var pointD = GetNext(pointC, angle, speed);
var coordFrac = 0.0f;
var edgeFrac = -1.0f;
var edgeStep = 2.0f / lineCount;
var coordStep = detailStep * TrailTile;
var angleA = angle;
var angleB = GetNextAngle(angleA);
var angleC = GetNextAngle(angleB);
var angleD = GetNextAngle(angleC);
var angleFrac = 0.0f;
var angleStep = detailStep * AnimAngleDetail;
var strengthA = 0.0f;
var strengthB = GetNextStrength();
var strengthC = GetNextStrength();
var strengthD = GetNextStrength();
var strengthFrac = 0.0f;
var strengthStep = detailStep * AnimStrengthDetail;
var colorA = GetNextColor();
var colorB = GetNextColor();
var colorC = GetNextColor();
var colorD = GetNextColor();
var colorFrac = 0.0f;
var colorStep = detailStep * ColorsDetail;
var heightA = GetNextHeight();
var heightB = GetNextHeight();
var heightC = GetNextHeight();
var heightD = GetNextHeight();
var heightFrac = 0.0f;
var heightStep = detailStep * TrailHeightsDetail;
for (var i = 0; i < lineCount; i++)
{
while (pointFrac >= 1.0f)
{
Shift(ref pointA, ref pointB, ref pointC, pointD, ref pointFrac); pointD = GetNext(pointC, angle, speed);
}
while (angleFrac >= 1.0f)
{
Shift(ref angleA, ref angleB, ref angleC, angleD, ref angleFrac); angleD = GetNextAngle(angleC);
}
while (strengthFrac >= 1.0f)
{
Shift(ref strengthA, ref strengthB, ref strengthC, strengthD, ref strengthFrac); strengthD = GetNextStrength();
}
while (colorFrac >= 1.0f)
{
Shift(ref colorA, ref colorB, ref colorC, colorD, ref colorFrac); colorD = GetNextColor();
}
while (heightFrac >= 1.0f)
{
Shift(ref heightA, ref heightB, ref heightC, heightD, ref heightFrac); heightD = GetNextHeight();
}
var point = SgtHelper.HermiteInterpolate3(pointA, pointB, pointC, pointD, pointFrac);
var animAng = SgtHelper.HermiteInterpolate(angleA, angleB, angleC, angleD, angleFrac);
var animStr = SgtHelper.HermiteInterpolate(strengthA, strengthB, strengthC, strengthD, strengthFrac);
var color = SgtHelper.HermiteInterpolate(colorA, colorB, colorC, colorD, colorFrac);
var height = SgtHelper.HermiteInterpolate(heightA, heightB, heightC, heightD, heightFrac);
// Fade edges
color.a *= Mathf.SmoothStep(1.0f, 0.0f, Mathf.Pow(Mathf.Abs(edgeFrac), TrailEdgeFade));
coords0.Add(new Vector4(coordFrac, 0.0f, animAng, animStr));
coords0.Add(new Vector4(coordFrac, height, animAng, animStr));
positions.Add(point);
positions.Add(point);
colors.Add(color);
colors.Add(color);
pointFrac += pointStep;
edgeFrac += edgeStep;
coordFrac += coordStep;
angleFrac += angleStep;
strengthFrac += strengthStep;
colorFrac += colorStep;
heightFrac += heightStep;
}
var vector = positions[1] - positions[0];
normals.Add(GetNormal(vector, vector));
normals.Add(GetNormal(vector, vector));
for (var i = 2; i < lineCount; i++)
{
var nextVector = positions[i] - positions[i - 1];
normals.Add(GetNormal(vector, nextVector));
normals.Add(GetNormal(vector, nextVector));
vector = nextVector;
}
normals.Add(GetNormal(vector, vector));
normals.Add(GetNormal(vector, vector));
for (var i = 0; i < quadCount; i++)
{
var offset = vertexCount + i * 2;
indices.Add(offset + 0);
indices.Add(offset + 1);
indices.Add(offset + 2);
indices.Add(offset + 3);
indices.Add(offset + 2);
indices.Add(offset + 1);
}
vertexCount += vertices;
}