public void Erode(SimpleHeightArray inHeightArray, ThermalErosionConfiguration configuration)
{
var tParam = configuration.TParam;
var cParam = configuration.CParam;
var stepCount = configuration.StepCount;
var thermalErosionGroundMover = configuration.GroundMover;
var neighbourChooser = configuration.NeighboursChooser;
var finalDifferenceArray = new SimpleHeightArray(inHeightArray.Width, inHeightArray.Height);
for (int stepIndex = 0; stepIndex < stepCount; stepIndex++)
{
Parallel.For <SimpleHeightArray>(0, inHeightArray.Height,
new ParallelOptions {
MaxDegreeOfParallelism = 4
},
() => new SimpleHeightArray(inHeightArray.Width, inHeightArray.Height),
(y, loop, localDifferenceArray) =>
{
// Parallel.For(0, inHeightArray.Height,new ParallelOptions { MaxDegreeOfParallelism = 3 }, y =>
// for (int y = 0; y < inHeightArray.Height; y++)
// {
for (int x = 0; x < inHeightArray.Width; x++)
{
var point = new IntVector2(x, y);
var thisValue = inHeightArray.GetValue(point);
var neighbours = configuration.NeighbourFinder.Find(inHeightArray, point)
.Select(n => new NeighbourInfo(n, thisValue - inHeightArray.GetValue(n))).ToList();
neighbours = neighbours.Where(c => neighbourChooser.Choose(c, configuration)).ToList();
if (!neighbours.Any())
{
continue;
}
var changeArray = localDifferenceArray;
//changeArray = finalDifferenceArray;
thermalErosionGroundMover.Move(neighbours, configuration, changeArray, point);
}
return(localDifferenceArray);
},
(localDifferenceArray) => { finalDifferenceArray.SumValue(localDifferenceArray); });
for (int y = 0; y < inHeightArray.Height; y++)
{
for (int x = 0; x < inHeightArray.Width; x++)
{
var point = new IntVector2(x, y);
inHeightArray.AddValue(point, finalDifferenceArray.GetValue(point));
finalDifferenceArray.SetValue(point, 0);
}
}
}
}
public void AtOnceErode(SimpleHeightArray inHeightArray, ThermalErosionConfiguration configuration)
{
var tParam = configuration.TParam;
var cParam = configuration.CParam;
var stepCount = configuration.StepCount;
for (int stepIndex = 0; stepIndex < stepCount; stepIndex++)
{
for (int y = 0; y < inHeightArray.Height; y++)
{
for (int x = 0; x < inHeightArray.Width; x++)
{
var point = new IntVector2(x, y);
var thisValue = inHeightArray.GetValue(point);
var neighbours = configuration.NeighbourFinder.Find(inHeightArray, point).Select(n => new
{
point = n,
difference = thisValue - inHeightArray.GetValue(n)
}).ToList();
neighbours = neighbours.Where(c => c.difference > tParam).ToList();
if (!neighbours.Any())
{
continue;
}
var dTotal = neighbours.Sum(c => c.difference);
var dMax = neighbours.Max(c => c.difference);
foreach (var aNeighbour in neighbours)
{
var movedGround = cParam * (dMax - tParam) * (aNeighbour.difference / dTotal);
inHeightArray.AddValue(aNeighbour.point, movedGround);
inHeightArray.AddValue(point, -movedGround);
}
}
}
}
}
public TerrainErosionDebugOutput ErodeWithDebug(SimpleHeightArray heightMap,
MeiHydraulicEroderConfiguration configuration)
{
var debugOutput = new TerrainErosionDebugOutput();
var sb = new StringBuilder();
int stepCount = configuration.StepCount;
float deltaT = configuration.DeltaT;
float constantWaterAdding = configuration.ConstantWaterAdding;
float A_pipeCrossSection = configuration.A_PipeCrossSection;
float l_pipeLength = configuration.L_PipeLength;
float g_GravityAcceleration = configuration.GravityAcceleration;
float ks_DissolvingConstant = configuration.DissolvingConstant;
float kd_DepositionConstant = configuration.DepositionConstant;
float ke_EvaporationConstant = configuration.EvaporationConstant;
float kc_SedimentCapacityConstant = configuration.SedimentCapacityConstant;
Vector2 gridSize = configuration.GridSize;
float lX = gridSize.x;
float lY = gridSize.y;
var waterMap = new SimpleHeightArray(heightMap.Width, heightMap.Height);
var waterMap_1 = new SimpleHeightArray(heightMap.Width, heightMap.Height);
var waterMap_2 = new SimpleHeightArray(heightMap.Width, heightMap.Height);
var fluxMap = new Vector4ArrayTODO(heightMap.Width, heightMap.Height);
var velocityMap = new VectorArrayTODO(heightMap.Width, heightMap.Height);
var sedimentMap = new SimpleHeightArray(heightMap.Width, heightMap.Height);
var sedimentMap_1 = new SimpleHeightArray(heightMap.Width, heightMap.Height);
for (int i = 0; i < stepCount; i++)
{
if (i >= 0)
{
// water increment
for (int y = 0; y < heightMap.Height; y++)
{
for (int x = 0; x < heightMap.Width; x++)
{
var aPoint = new IntVector2(x, y);
var oldValue = waterMap.GetValue(aPoint);
var newAmount = oldValue + deltaT * constantWaterAdding;
waterMap_1.SetValue(aPoint, newAmount);
if (x == 10 && y == 10)
{
var settings = DebugGetMapValues(x, y, waterMap, waterMap_1, waterMap_2, fluxMap,
velocityMap, sedimentMap, sedimentMap_1);
int yyy = 2;
}
}
}
}
else
{
MyArrayUtils.Copy(waterMap.Array, waterMap_1.Array);
}
debugOutput.AddArray("waterMap", SimpleHeightArray.ToHeightmap(waterMap_1), i);
debugOutput.AddArray("heightMap", SimpleHeightArray.ToHeightmap(heightMap), i);
debugOutput.AddArray("sedimentMap", SimpleHeightArray.ToHeightmap(sedimentMap), i);
var speedMap = new float[sedimentMap.Width, sedimentMap.Height];
for (int x = 0; x < sedimentMap.Width; x++)
{
for (int y = 0; y < sedimentMap.Height; y++)
{
speedMap[x, y] = velocityMap.GetValue(x, y).magnitude;
}
}
debugOutput.AddArray("speedMap", new HeightmapArray(speedMap), i);
// flow simulation
int onesCount = 0;
for (int y = 0; y < heightMap.Height; y++)
{
for (int x = 0; x < heightMap.Width; x++)
{
var aPoint = new IntVector2(x, y);
if (x == 10 && y == 10)
{
var settings = DebugGetMapValues(x, y, waterMap, waterMap_1, waterMap_2, fluxMap,
velocityMap, sedimentMap, sedimentMap_1);
Debug.Log("T44. W0: " + waterMap.GetValue(aPoint) + " w1: " + waterMap_1.GetValue(aPoint));
int yyy = 2;
}
Vector4 newFlux = Vector4.zero;
var neighbours = GetNeighbours(heightMap, aPoint);
foreach (var neighbour in neighbours)
{
var d_difference = (heightMap.GetValue(aPoint) + waterMap_1.GetValue(aPoint)) -
(heightMap.GetValue(neighbour.Position) +
waterMap_1.GetValue(neighbour.Position));
var d_flux = fluxMap.GetValue(aPoint)[(int)neighbour.DirectionIndex];
var d_new_flux = Mathf.Max(0,
d_flux + deltaT * A_pipeCrossSection * (g_GravityAcceleration * d_difference) /
l_pipeLength);
Preconditions.Assert(!float.IsNaN(d_new_flux), "");
newFlux[(int)neighbour.DirectionIndex] = d_new_flux;
}
var aD1 = waterMap_1.GetValue(aPoint);
var fluxSum = VectorUtils.SumMembers(newFlux);
float K_factor = 0;
if (fluxSum != 0)
{
K_factor = Mathf.Min(1,
aD1 * (lX * lY) / (fluxSum * deltaT));
}
if (K_factor > 0.99999)
{
onesCount++;
}
fluxMap.SetValue(aPoint, K_factor * newFlux);
}
}
Debug.Log("t66: onesCount is " + onesCount);
// velocity calculation
for (int y = 0; y < heightMap.Height; y++)
{
for (int x = 0; x < heightMap.Width; x++)
{
var aPoint = new IntVector2(x, y);
if (x == 10 && y == 10)
{
var settings = DebugGetMapValues(x, y, waterMap, waterMap_1, waterMap_2, fluxMap,
velocityMap, sedimentMap, sedimentMap_1);
int yyy = 2;
}
var neighbours = GetNeighbours(heightMap, aPoint);
var outFlow = VectorUtils.SumMembers(fluxMap.GetValue(aPoint));
var inFlow =
neighbours.Select(c => fluxMap.GetValue(c.Position)[(int)c.DirectionIndex.GetOpposite()])
.Sum();
var aChangeOfWater = deltaT * (inFlow - outFlow);
waterMap_2.SetValue(aPoint,
Mathf.Max(0, waterMap_1.GetValue(aPoint) + aChangeOfWater / (lX * lY)));
var horizontalFlux =
GetFlux(fluxMap, neighbours, MaiNeighbourDirection.LEFT, MaiNeighbourDirection.RIGHT) -
fluxMap.GetValue(aPoint)[(int)MaiNeighbourDirection.LEFT] +
fluxMap.GetValue(aPoint)[(int)MaiNeighbourDirection.RIGHT] -
GetFlux(fluxMap, neighbours, MaiNeighbourDirection.RIGHT, MaiNeighbourDirection.LEFT);
var deltaWx = horizontalFlux / 2;
var verticalFlux =
GetFlux(fluxMap, neighbours, MaiNeighbourDirection.DOWN, MaiNeighbourDirection.UP) -
fluxMap.GetValue(aPoint)[(int)MaiNeighbourDirection.DOWN] +
fluxMap.GetValue(aPoint)[(int)MaiNeighbourDirection.UP] -
GetFlux(fluxMap, neighbours, MaiNeighbourDirection.UP, MaiNeighbourDirection.DOWN);
var deltaWy = verticalFlux / 2;
var avgHeight = (waterMap_1.GetValue(aPoint) + waterMap_2.GetValue(aPoint)) / 2;
var newVelocity = new Vector2(
(deltaWx / (lX * avgHeight)),
(deltaWy / (lY * avgHeight))
);
if (float.IsNaN(newVelocity.magnitude))
{
newVelocity = Vector2.zero;
}
velocityMap.SetValue(aPoint, newVelocity); //todo ograniczenie CFL
}
}
var erodedAmountMap = new float[sedimentMap.Width, sedimentMap.Height];
var depositionAmountMap = new float[sedimentMap.Width, sedimentMap.Height];
// sediment calc
for (int y = 0; y < heightMap.Height; y++)
{
for (int x = 0; x < heightMap.Width; x++)
{
var aPoint = new IntVector2(x, y);
if (x == 10 && y == 10)
{
var settings = DebugGetMapValues(x, y, waterMap, waterMap_1, waterMap_2, fluxMap,
velocityMap, sedimentMap, sedimentMap_1);
int yyy = 2;
}
var aHeight = heightMap.GetValue(aPoint);
Vector3 upDir = new Vector3(0, 0, lY);
if (y != heightMap.Height - 1)
{
var upHeight = heightMap.GetValue(aPoint + new IntVector2(0, 1));
upDir[1] = upHeight - aHeight;
}
Vector3 rightDir = new Vector3(lX, 0, 0);
if (x != heightMap.Width - 1)
{
var rightHeight = heightMap.GetValue(aPoint + new IntVector2(1, 0));
rightDir[1] = rightHeight - aHeight;
}
var aNormal = Vector3.Cross(upDir, rightDir);
var baseNormal = new Vector3(0, 1, 0);
var cosAlpha = Vector3.Dot(baseNormal, aNormal) / (baseNormal.magnitude * aNormal.magnitude);
var sinAlpha = Math.Sqrt(1 - cosAlpha * cosAlpha);
//////// OTHER CALCULATING
var _o_notmal =
new Vector3(
heightMap.GetValueWithZeroInMissing(y, x + 1) -
heightMap.GetValueWithZeroInMissing(y, x - 1),
heightMap.GetValueWithZeroInMissing(y + 1, x) -
heightMap.GetValueWithZeroInMissing(y - 1, x), 2);
var o_normal2 = _o_notmal.normalized;
Vector3 up = new Vector3(0, 1, 0);
float cosa = Vector3.Dot(o_normal2, up);
float o_sinAlpha = Mathf.Sin(Mathf.Acos(cosa));
// todo kontrolne zwiększenie wody
var capacity = kc_SedimentCapacityConstant * Mathf.Max(o_sinAlpha, 0.1f) *
velocityMap.GetValue(aPoint).magnitude; //todo set minimum alpha
var suspendedSediment = sedimentMap.GetValue(aPoint);
erodedAmountMap[x, y] = 0;
depositionAmountMap[x, y] = 0;
if (capacity > suspendedSediment)
{
var sedimentChangeAmount = (float)(ks_DissolvingConstant * (capacity - suspendedSediment));
erodedAmountMap[x, y] = sedimentChangeAmount;
heightMap.AddValue(aPoint, -sedimentChangeAmount);
sedimentMap_1.AddValue(aPoint, sedimentChangeAmount);
}
else
{
var sedimentChangeAmount = (float)(kd_DepositionConstant * (suspendedSediment - capacity));
depositionAmountMap[x, y] = sedimentChangeAmount;
heightMap.AddValue(aPoint,
sedimentChangeAmount); // sedimentChangeAmount jest ujemna, więc dodajemy teren
sedimentMap_1.AddValue(aPoint, -sedimentChangeAmount);
}
}
}
debugOutput.AddArray("erodedAmount", new HeightmapArray(erodedAmountMap), i);
debugOutput.AddArray("depositedAmount", new HeightmapArray(depositionAmountMap), i);
// sediment transportation
for (int y = 0; y < heightMap.Height; y++)
{
for (int x = 0; x < heightMap.Width; x++)
{
var aPoint = new IntVector2(x, y);
if (x == 10 && y == 10)
{
var settings = DebugGetMapValues(x, y, waterMap, waterMap_1, waterMap_2, fluxMap,
velocityMap, sedimentMap, sedimentMap_1);
int yyy = 2;
}
var velocity = velocityMap.GetValue(aPoint);
sedimentMap.SetValue(aPoint,
sedimentMap_1.GetValueWithIndexClamped(aPoint.ToFloatVec() - velocity * deltaT));
}
}
//evaporation
for (int y = 0; y < heightMap.Height; y++)
{
for (int x = 0; x < heightMap.Width; x++)
{
var aPoint = new IntVector2(x, y);
if (x == 10 && y == 10)
{
var settings = DebugGetMapValues(x, y, waterMap, waterMap_1, waterMap_2, fluxMap,
velocityMap, sedimentMap, sedimentMap_1);
int yyy = 2;
}
waterMap.SetValue(aPoint, waterMap_2.GetValue(aPoint) * (1 - ke_EvaporationConstant * deltaT));
}
}
}
//for (int y = 0; y < heightMap.Height; y++)
//{
// for (int x = 0; x < heightMap.Width; x++)
// {
// var aPoint = new IntVector2(x,y);
// heightMap.AddValue(aPoint, sedimentMap.GetValue(aPoint));
// }
//}
//Debug.Log("t23: " + sb.ToString());
return(debugOutput);
}
public void Erode(SimpleHeightArray heightMap, MeiHydraulicEroderConfiguration configuration)
{
//int stepCount = configuration.StepCount;
//float deltaT = configuration.DeltaT;
//float constantWaterAdding = configuration.ConstantWaterAdding;
//float A_pipeCrossSection = configuration.A_PipeCrossSection;
//float l_pipeLength = configuration.L_PipeLength;
//float g_GravityAcceleration = configuration.GravityAcceleration;
//float ks_DissolvingConstant = configuration.DissolvingConstant;
//float kd_DepositionConstant = configuration.DepositionConstant;
//float ke_EvaporationConstant = configuration.EvaporationConstant;
//float kc_SedimentCapacityConstant = configuration.SedimentCapacityConstant;
//Vector2 gridSize = configuration.GridSize;
int stepCount = configuration.StepCount;
float deltaT = configuration.DeltaT;
float constantWaterAdding = configuration.ConstantWaterAdding;
float A_pipeCrossSection = configuration.A_PipeCrossSection;
float l_pipeLength = configuration.L_PipeLength;
float g_GravityAcceleration = configuration.GravityAcceleration;
float ks_DissolvingConstant = configuration.DissolvingConstant;
float kd_DepositionConstant = configuration.DepositionConstant;
float ke_EvaporationConstant = configuration.EvaporationConstant;
float kc_SedimentCapacityConstant = configuration.SedimentCapacityConstant;
Vector2 gridSize = configuration.GridSize;
float lX = gridSize.x;
float lY = gridSize.y;
var waterMap = new SimpleHeightArray(heightMap.Width, heightMap.Height);
var waterMap_1 = new SimpleHeightArray(heightMap.Width, heightMap.Height);
var waterMap_2 = new SimpleHeightArray(heightMap.Width, heightMap.Height);
var fluxMap = new MySimpleArray <Vector4>(heightMap.Width, heightMap.Height);
var velocityMap = new MySimpleArray <Vector2>(heightMap.Width, heightMap.Height);
var sedimentMap = new SimpleHeightArray(heightMap.Width, heightMap.Height);
var sedimentMap_1 = new SimpleHeightArray(heightMap.Width, heightMap.Height);
for (int i = 0; i < stepCount; i++)
{
// water increment
for (int y = 0; y < heightMap.Height; y++)
{
for (int x = 0; x < heightMap.Width; x++)
{
var aPoint = new IntVector2(x, y);
waterMap_1.SetValue(aPoint, waterMap.GetValue(aPoint) + deltaT * constantWaterAdding);
}
}
// flow simulation
for (int y = 0; y < heightMap.Height; y++)
{
for (int x = 0; x < heightMap.Width; x++)
{
var aPoint = new IntVector2(x, y);
if (x == 10 && y == 10)
{
int yyy = 2;
}
Vector4 newFlux = Vector4.zero;
var neighbours = GetNeighbours(heightMap, aPoint);
foreach (var neighbour in neighbours)
{
var d_difference = (heightMap.GetValue(aPoint) + waterMap_1.GetValue(aPoint)) -
(heightMap.GetValue(neighbour.Position) +
waterMap_1.GetValue(neighbour.Position));
var d_flux = fluxMap.GetValue(aPoint)[(int)neighbour.DirectionIndex];
var d_new_flux = Mathf.Max(0,
d_flux + deltaT * A_pipeCrossSection * (g_GravityAcceleration * d_difference) /
l_pipeLength);
newFlux[(int)neighbour.DirectionIndex] = d_new_flux;
}
var aD1 = waterMap_1.GetValue(aPoint);
var K_factor = Mathf.Min(1,
aD1 * (lX * lY) / ((newFlux[0] + newFlux[1] + newFlux[2] + newFlux[3]) * deltaT));
fluxMap.SetValue(aPoint, K_factor * newFlux);
}
}
// velocity calculation
for (int y = 0; y < heightMap.Height; y++)
{
for (int x = 0; x < heightMap.Width; x++)
{
var aPoint = new IntVector2(x, y);
if (x == 10 && y == 10)
{
int yyy = 2;
}
var neighbours = GetNeighbours(heightMap, aPoint);
var outFlow = VectorUtils.SumMembers(fluxMap.GetValue(aPoint));
var inFlow =
neighbours.Select(c => fluxMap.GetValue(c.Position)[(int)c.DirectionIndex.GetOpposite()])
.Sum();
var aChangeOfWater = deltaT * (inFlow - outFlow);
waterMap_2.SetValue(aPoint,
Mathf.Max(0, waterMap_1.GetValue(aPoint) + aChangeOfWater / (lX * lY)));
var horizontalFlux =
GetFlux(fluxMap, neighbours, MaiNeighbourDirection.LEFT, MaiNeighbourDirection.RIGHT) -
fluxMap.GetValue(aPoint)[(int)MaiNeighbourDirection.LEFT] +
fluxMap.GetValue(aPoint)[(int)MaiNeighbourDirection.RIGHT] -
GetFlux(fluxMap, neighbours, MaiNeighbourDirection.RIGHT, MaiNeighbourDirection.LEFT);
var deltaWx = horizontalFlux / 2;
var verticalFlux =
GetFlux(fluxMap, neighbours, MaiNeighbourDirection.DOWN, MaiNeighbourDirection.UP) -
fluxMap.GetValue(aPoint)[(int)MaiNeighbourDirection.DOWN] +
fluxMap.GetValue(aPoint)[(int)MaiNeighbourDirection.UP] -
GetFlux(fluxMap, neighbours, MaiNeighbourDirection.UP, MaiNeighbourDirection.DOWN);
var deltaWy = verticalFlux / 2;
var avgHeight = (waterMap_1.GetValue(aPoint) + waterMap_2.GetValue(aPoint)) / 2;
var newVelocity = new Vector2(
(deltaWx / (lX * avgHeight)),
(deltaWy / (lY * avgHeight))
);
velocityMap.SetValue(aPoint, newVelocity); //todo ograniczenie CFL
}
}
// sediment calc
for (int y = 0; y < heightMap.Height; y++)
{
for (int x = 0; x < heightMap.Width; x++)
{
var aPoint = new IntVector2(x, y);
if (x == 10 && y == 10)
{
int yyy = 2;
}
var aHeight = heightMap.GetValue(aPoint);
Vector3 upDir = new Vector3(0, 0, lY);
if (y != heightMap.Height - 1)
{
var upHeight = heightMap.GetValue(aPoint + new IntVector2(0, 1));
upDir[1] = upHeight - aHeight;
}
Vector3 rightDir = new Vector3(lX, 0, 0);
if (x != heightMap.Width - 1)
{
var rightHeight = heightMap.GetValue(aPoint + new IntVector2(1, 0));
rightDir[1] = rightHeight - aHeight;
}
var aNormal = Vector3.Cross(upDir, rightDir);
var baseNormal = new Vector3(0, 1, 0);
var cosAlpha = Vector3.Dot(baseNormal, aNormal) / (baseNormal.magnitude * aNormal.magnitude);
var sinAlpha = Math.Sqrt(1 - cosAlpha * cosAlpha);
//////// OTHER CALCULATING
var _o_notmal =
new Vector3(
heightMap.GetValueWithZeroInMissing(y, x + 1) -
heightMap.GetValueWithZeroInMissing(y, x - 1),
heightMap.GetValueWithZeroInMissing(y + 1, x) -
heightMap.GetValueWithZeroInMissing(y - 1, x), 2);
var o_normal2 = _o_notmal.normalized;
Vector3 up = new Vector3(0, 1, 0);
float cosa = Vector3.Dot(o_normal2, up);
float o_sinAlpha = Mathf.Sin(Mathf.Acos(cosa));
// todo kontrolne zwiększenie wody
var capacity = kc_SedimentCapacityConstant * sinAlpha *
velocityMap.GetValue(aPoint).magnitude; //todo set minimum alpha
var suspendedSediment = sedimentMap.GetValue(aPoint);
if (capacity > suspendedSediment)
{
var sedimentChangeAmount = (float)(ks_DissolvingConstant * (capacity - suspendedSediment));
heightMap.AddValue(aPoint, -sedimentChangeAmount);
sedimentMap_1.AddValue(aPoint, sedimentChangeAmount);
}
else
{
var sedimentChangeAmount = (float)(kd_DepositionConstant * (suspendedSediment - capacity));
heightMap.AddValue(aPoint,
sedimentChangeAmount); // sedimentChangeAmount jest ujemna, więc dodajemy teren
sedimentMap_1.AddValue(aPoint, -sedimentChangeAmount);
}
}
}
// sediment transportation
for (int y = 0; y < heightMap.Height; y++)
{
for (int x = 0; x < heightMap.Width; x++)
{
var aPoint = new IntVector2(x, y);
if (x == 10 && y == 10)
{
int yyy = 2;
}
var velocity = velocityMap.GetValue(aPoint);
sedimentMap.SetValue(aPoint,
sedimentMap_1.GetValueWithIndexClamped(aPoint.ToFloatVec() - velocity * deltaT));
}
}
//evaporation
for (int y = 0; y < heightMap.Height; y++)
{
for (int x = 0; x < heightMap.Width; x++)
{
var aPoint = new IntVector2(x, y);
if (x == 10 && y == 10)
{
int yyy = 2;
}
waterMap.SetValue(aPoint, waterMap_2.GetValue(aPoint) * (1 - ke_EvaporationConstant * deltaT));
}
}
}
//for (int y = 0; y < heightMap.Height; y++)
//{
// for (int x = 0; x < heightMap.Width; x++)
// {
// var aPoint = new IntVector2(x,y);
// heightMap.AddValue(aPoint, sedimentMap.GetValue(aPoint));
// }
//}
}
public DebuggableHydraulicEroderOutput Erode(SimpleHeightArray heightMap,
HydraulicEroderConfiguration configuration, int snapshotFrequencies)
{
List <SimpleHeightArray> WaterSnapshots = new List <SimpleHeightArray>();
List <SimpleHeightArray> SedimentSnapshots = new List <SimpleHeightArray>();
float krParam = configuration.kr_ConstantWaterAddition;
float ksParam = configuration.ks_GroundToSedimentFactor;
float keParam = configuration.ke_WaterEvaporationFactor;
float kcParam = configuration.kc_MaxSedimentationFactor;
bool finalSedimentationToGround = configuration.FinalSedimentationToGround;
int stepCount = configuration.StepCount;
ErodedNeighbourFinder neighbourFinder = configuration.NeighbourFinder;
var waterMap = new SimpleHeightArray(heightMap.Width, heightMap.Height);
var sedimentMap = new SimpleHeightArray(heightMap.Width, heightMap.Height);
var sedimentAdditionMap = new SimpleHeightArray(heightMap.Width, heightMap.Height);
var waterAdditionMap = new SimpleHeightArray(heightMap.Width, heightMap.Height);
for (int i = 0; i < stepCount; i++)
{
for (int y = 0; y < heightMap.Height; y++)
{
for (int x = 0; x < heightMap.Width; x++)
{
var point = new IntVector2(x, y);
if (configuration.WaterGenerator == HydraulicEroderWaterGenerator.FirstFrame)
{
if (i == 0)
{
waterMap.AddValue(point, krParam);
}
}
else
{
waterMap.AddValue(point, krParam);
}
float amountChangedToSediment = ksParam * waterMap.GetValue(point);
heightMap.AddValue(point, -amountChangedToSediment);
sedimentMap.AddValue(point, amountChangedToSediment);
}
}
if (i == 0)
{
WaterSnapshots.Add(new SimpleHeightArray(MyArrayUtils.DeepClone <float>(waterMap.Array)));
SedimentSnapshots.Add(new SimpleHeightArray(MyArrayUtils.DeepClone <float>(sedimentMap.Array)));
}
for (int y = 0; y < heightMap.Height; y++)
{
for (int x = 0; x < heightMap.Width; x++)
{
var point = new IntVector2(x, y);
var neighbourPoints = neighbourFinder.Find(heightMap, point);
var pTotalHeight = heightMap.GetValue(point) + waterMap.GetValue(point);
var neighbours = neighbourPoints.Select(nPoint => new
{
Point = nPoint,
TotalHeight = heightMap.GetValue(nPoint) + waterMap.GetValue(nPoint),
TotalHeightDifference = pTotalHeight - (heightMap.GetValue(nPoint) +
waterMap.GetValue(nPoint)),
}).Where(c => c.TotalHeightDifference > 0).ToList();
if (!neighbours.Any())
{
continue;
}
var dTotalHeightDiffSum = neighbours.Sum(c => c.TotalHeightDifference);
var avgTotalHeight = (neighbours.Sum(c => c.TotalHeight) + pTotalHeight) /
(neighbours.Count + 1);
var pSediment = sedimentMap.GetValue(point);
var pWater = waterMap.GetValue(point);
if (pWater < 0.00000001f)
{
continue;
}
var pDeltaA = pTotalHeight - avgTotalHeight;
var pMin = Mathf.Min(pDeltaA, pWater);
if (configuration.DestinationFinder == HydraulicEroderWaterDestinationFinder.OnlyBest)
{
var bestNeighbour = neighbours.OrderByDescending(c => c.TotalHeightDifference).First();
var nMovedWater = pMin;
var addedSediment = pSediment * (nMovedWater / pWater);
waterAdditionMap.AddValue(bestNeighbour.Point, nMovedWater);
sedimentAdditionMap.AddValue(bestNeighbour.Point, addedSediment);
sedimentAdditionMap.AddValue(point, -addedSediment);
waterAdditionMap.AddValue(point, -pMin);
}
else
{
var movedSedimentSum = 0f;
foreach (var aNeighbour in neighbours)
{
var nMovedWater = pMin * (aNeighbour.TotalHeightDifference / dTotalHeightDiffSum);
var addedSediment = pSediment * (nMovedWater / pWater);
movedSedimentSum += addedSediment;
waterAdditionMap.AddValue(aNeighbour.Point, nMovedWater);
sedimentAdditionMap.AddValue(aNeighbour.Point, addedSediment);
}
sedimentAdditionMap.AddValue(point, -movedSedimentSum);
waterAdditionMap.AddValue(point, -pMin);
}
}
}
for (int y = 0; y < heightMap.Height; y++)
{
for (int x = 0; x < heightMap.Width; x++)
{
var point = new IntVector2(x, y);
waterMap.AddValue(point, waterAdditionMap.GetValue(point));
waterAdditionMap.SetValue(point, 0);
sedimentMap.AddValue(point, sedimentAdditionMap.GetValue(point));
sedimentAdditionMap.SetValue(point, 0);
}
}
for (int y = 0; y < heightMap.Height; y++)
{
for (int x = 0; x < heightMap.Width; x++)
{
var point = new IntVector2(x, y);
var pWater = waterMap.GetValue(point);
var waterAfterEvaporation = pWater * (1 - keParam);
waterMap.SetValue(point, waterAfterEvaporation);
var pSedimentMax = kcParam * waterAfterEvaporation;
var pSediment = sedimentMap.GetValue(point);
var deltaSediment = Mathf.Max(0, pSediment - pSedimentMax);
sedimentMap.AddValue(point, -deltaSediment);
heightMap.AddValue(point, deltaSediment);
}
}
if (i % snapshotFrequencies == 0)
{
WaterSnapshots.Add(new SimpleHeightArray(MyArrayUtils.DeepClone <float>(waterMap.Array)));
SedimentSnapshots.Add(new SimpleHeightArray(MyArrayUtils.DeepClone <float>(sedimentMap.Array)));
}
}
if (finalSedimentationToGround)
{
for (int y = 0; y < heightMap.Height; y++)
{
for (int x = 0; x < heightMap.Width; x++)
{
var point = new IntVector2(x, y);
heightMap.AddValue(point, sedimentMap.GetValue(point));
}
}
}
return(new DebuggableHydraulicEroderOutput()
{
SedimentSnapshots = SedimentSnapshots,
WaterSnapshots = WaterSnapshots
});
}
public void Erode(SimpleHeightArray inHeightArray, ThermalErosionConfiguration configuration)
{
var tParam = configuration.TParam;
var cParam = configuration.CParam;
var stepCount = configuration.StepCount;
var finalDifferenceArray = new SimpleHeightArray(inHeightArray.Width, inHeightArray.Height);
for (int stepIndex = 0; stepIndex < stepCount; stepIndex++)
{
Parallel.For <SimpleHeightArray>(0, inHeightArray.Height,
new ParallelOptions {
MaxDegreeOfParallelism = 4
},
() => new SimpleHeightArray(inHeightArray.Width, inHeightArray.Height),
(y, loop, localDifferenceArray) =>
{
// Parallel.For(0, inHeightArray.Height,new ParallelOptions { MaxDegreeOfParallelism = 3 }, y =>
// for (int y = 0; y < inHeightArray.Height; y++)
// {
for (int x = 0; x < inHeightArray.Width; x++)
{
var point = new IntVector2(x, y);
var thisValue = inHeightArray.GetValue(point);
var neighbours = configuration.NeighbourFinder.Find(inHeightArray, point).Select(n => new
{
point = n,
difference = thisValue - inHeightArray.GetValue(n)
}).ToList();
neighbours = neighbours.Where(c => c.difference < tParam && c.difference > 0).ToList();
if (!neighbours.Any())
{
continue;
}
var dTotal = neighbours.Sum(c => c.difference);
var dMax = neighbours.Max(c => c.difference);
foreach (var aNeighbour in neighbours)
{
var movedGround = cParam * (dMax) * (aNeighbour.difference / dTotal);
//finalDifferenceArray.AddValue(aNeighbour.point, movedGround);
//finalDifferenceArray.AddValue(point, -movedGround);
localDifferenceArray.AddValue(aNeighbour.point, movedGround);
localDifferenceArray.AddValue(point, -movedGround);
}
}
return(localDifferenceArray);
},
(localDifferenceArray) => { finalDifferenceArray.SumValue(localDifferenceArray); });
for (int y = 0; y < inHeightArray.Height; y++)
{
for (int x = 0; x < inHeightArray.Width; x++)
{
var point = new IntVector2(x, y);
inHeightArray.AddValue(point, finalDifferenceArray.GetValue(point));
finalDifferenceArray.SetValue(point, 0);
}
}
}
}
