public override double GetValue(double x, double y, double z)
{
if (SourceModule1 == null || SourceModule2 == null || WeightModule == null)
{
throw new NullReferenceException("No source module can be null");
}
return(NoiseMath.LinearInterpolate(SourceModule1.GetValue(x, y, z), SourceModule2.GetValue(x, y, z),
(WeightModule.GetValue(x, y, z) + 1.0) / 2.0));
}
public override double GetValue(double x, double y, double z)
{
if (SourceModule == null)
{
throw new InvalidOperationException("Source Module cannot be null");
}
// Get the output value from the source module.
double sourceModuleValue = SourceModule.GetValue(x, y, z);
// Find the first element in the control point array that has a value
// larger than the output value from the source module.
int indexPos;
for (indexPos = 0; indexPos < ControlPoints.Length; indexPos++)
{
if (sourceModuleValue < ControlPoints[indexPos])
{
break;
}
}
// Find the two nearest control points so that we can map their values
// onto a quadratic curve.
int index0 = NoiseMath.ClampValue(indexPos - 1, 0, ControlPoints.Length - 1);
int index1 = NoiseMath.ClampValue(indexPos, 0, ControlPoints.Length - 1);
// If some control points are missing (which occurs if the output value from
// the source module is greater than the largest value or less than the
// smallest value of the control point array), get the value of the nearest
// control point and exit now.
if (index0 == index1)
{
return(ControlPoints[index1]);
}
// Compute the alpha value used for linear interpolation.
double value0 = ControlPoints[index0];
double value1 = ControlPoints[index1];
double alpha = (sourceModuleValue - value0) / (value1 - value0);
if (InvertTerraces)
{
alpha = 1.0 - alpha;
double temp = value0;
value0 = value1;
value1 = temp;
}
// Squaring the alpha produces the terrace effect.
alpha *= alpha;
// Now perform the linear interpolation given the alpha value.
return(NoiseMath.LinearInterpolate(value0, value1, alpha));
}
internal static double GradientCoherentNoise(double x, double y, double z, int seed, NoiseQuality noiseQuality)
{
int x0 = (x > 0.0 ? (int)x : (int)x - 1);
int x1 = x0 + 1;
int y0 = (y > 0.0 ? (int)y : (int)y - 1);
int y1 = y0 + 1;
int z0 = (z > 0.0 ? (int)z : (int)z - 1);
int z1 = z0 + 1;
double xs = 0, ys = 0, zs = 0;
switch (noiseQuality)
{
case NoiseQuality.Low:
xs = (x - x0);
ys = (y - y0);
zs = (z - z0);
break;
case NoiseQuality.Standard:
xs = NoiseMath.SCurve3(x - x0);
ys = NoiseMath.SCurve3(y - y0);
zs = NoiseMath.SCurve3(z - z0);
break;
case NoiseQuality.High:
xs = NoiseMath.SCurve5(x - x0);
ys = NoiseMath.SCurve5(y - y0);
zs = NoiseMath.SCurve5(z - z0);
break;
}
double n0 = GradientNoise(x, y, z, x0, y0, z0, seed);
double n1 = GradientNoise(x, y, z, x1, y0, z0, seed);
double ix0 = NoiseMath.LinearInterpolate(n0, n1, xs);
n0 = GradientNoise(x, y, z, x0, y1, z0, seed);
n1 = GradientNoise(x, y, z, x1, y1, z0, seed);
double ix1 = NoiseMath.LinearInterpolate(n0, n1, xs);
double iy0 = NoiseMath.LinearInterpolate(ix0, ix1, ys);
n0 = GradientNoise(x, y, z, x0, y0, z1, seed);
n1 = GradientNoise(x, y, z, x1, y0, z1, seed);
ix0 = NoiseMath.LinearInterpolate(n0, n1, xs);
n0 = GradientNoise(x, y, z, x0, y1, z1, seed);
n1 = GradientNoise(x, y, z, x1, y1, z1, seed);
ix1 = NoiseMath.LinearInterpolate(n0, n1, xs);
double iy1 = NoiseMath.LinearInterpolate(ix0, ix1, ys);
return(NoiseMath.LinearInterpolate(iy0, iy1, zs));
}
public override double GetValue(double x, double y, double z)
{
if (ModuleA == null)
{
throw new InvalidOperationException("ModuleA cannot be null");
}
if (ModuleB == null)
{
throw new InvalidOperationException("ModuleB cannot be null");
}
if (ControlModule == null)
{
throw new InvalidOperationException("Control cannot be null");
}
double controlValue = ControlModule.GetValue(x, y, z);
if (edgeFalloff > 0.0)
{
if (controlValue < (LowerBound - edgeFalloff))
{
// The output value from the control module is below the selector
// threshold; return the output value from the first source module.
return(ModuleA.GetValue(x, y, z));
}
double alpha;
if (controlValue < (LowerBound + edgeFalloff))
{
// The output value from the control module is near the lower end of the
// selector threshold and within the smooth curve. Interpolate between
// the output values from the first and second source modules.
double lowerCurve = (LowerBound - edgeFalloff);
double upperCurve = (LowerBound + edgeFalloff);
alpha = NoiseMath.SCurve3((controlValue - lowerCurve) / (upperCurve - lowerCurve));
return(NoiseMath.LinearInterpolate(ModuleA.GetValue(x, y, z), ModuleB.GetValue(x, y, z), alpha));
}
if (controlValue < (UpperBound - edgeFalloff))
{
// The output value from the control module is within the selector
// threshold; return the output value from the second source module.
return(ModuleB.GetValue(x, y, z));
}
if (controlValue < (UpperBound + edgeFalloff))
{
// The output value from the control module is near the upper end of the
// selector threshold and within the smooth curve. Interpolate between
// the output values from the first and second source modules.
double lowerCurve = (UpperBound - edgeFalloff);
double upperCurve = (UpperBound + edgeFalloff);
alpha = NoiseMath.SCurve3((controlValue - lowerCurve) / (upperCurve - lowerCurve));
return(NoiseMath.LinearInterpolate(ModuleB.GetValue(x, y, z), ModuleA.GetValue(x, y, z), alpha));
}
// Output value from the control module is above the selector threshold;
// return the output value from the first source module.
return(ModuleA.GetValue(x, y, z));
}
if (controlValue < LowerBound || controlValue > UpperBound)
{
return(ModuleA.GetValue(x, y, z));
}
return(ModuleB.GetValue(x, y, z));
}
