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 Start_Hydraulic_Debuggable()
{
var heightTexture1 = SavingFileManager.LoadPngTextureFromFile(@"C:\inz\cont\smallCut.png", 240,
240, TextureFormat.RGBA32, true, true);
var heightmap1 = HeightmapUtils.CreateHeightmapArrayFromTexture(heightTexture1);
//DiamondSquareCreator creator = new DiamondSquareCreator(new RandomProvider(22));
//var heightmap2 = creator.CreateDiamondSquareNoiseArray(new IntVector2(240, 240), 64);
//MyArrayUtils.Multiply(heightmap2.HeightmapAsArray, 0.1f);
var tParam = EroderDebugObject.CalculateFromHillFactor(1, new ArrayExtremes(0, 5000), 24);
var extents = MyArrayUtils.CalculateExtremes(heightmap1.HeightmapAsArray);
MyArrayUtils.Normalize(heightmap1.HeightmapAsArray);
var configuration =
new HydraulicEroderConfiguration()
{
StepCount = 20,
NeighbourFinder = NeighbourFinders.Big9Finder,
kr_ConstantWaterAddition = 0.001f,
ks_GroundToSedimentFactor = 1f,
ke_WaterEvaporationFactor = 0.05f,
kc_MaxSedimentationFactor = 0.8f,
FinalSedimentationToGround = false,
WaterGenerator = HydraulicEroderWaterGenerator.FirstFrame,
DestinationFinder = HydraulicEroderWaterDestinationFinder.OnlyBest
};
var copyArray = MyArrayUtils.DeepClone(heightmap1.HeightmapAsArray);
var currentHeightArray = new SimpleHeightArray(copyArray);
var eroder = new DebuggableHydraulicEroder();
var debuggingOutput = eroder.Erode(currentHeightArray, configuration, 1);
var sedimentExtentsArr = debuggingOutput.SedimentSnapshots
.Select(c => MyArrayUtils.CalculateExtremes(c.Array)).ToList();
var sedimentExtents = new ArrayExtremes(sedimentExtentsArr.Min(c => c.Min),
sedimentExtentsArr.Max(c => c.Max));
debuggingOutput.SedimentSnapshots.ForEach(c => MyArrayUtils.Normalize(c.Array, sedimentExtents));
var waterExtentsArr = debuggingOutput.WaterSnapshots.Select(c => MyArrayUtils.CalculateExtremes(c.Array))
.ToList();
var waterExtents = new ArrayExtremes(waterExtentsArr.Min(c => c.Min), waterExtentsArr.Max(c => c.Max));
debuggingOutput.WaterSnapshots.ForEach(c => MyArrayUtils.Normalize(c.Array, waterExtents));
_go = GameObject.CreatePrimitive(PrimitiveType.Quad);
var material = new Material(Shader.Find("Custom/Terrain/Terrain_Debug_Comparision_StepByStep"));
_go.GetComponent <MeshRenderer>().material = material;
_go.name = "Terrain";
_go.transform.localRotation = Quaternion.Euler(0, 0, 0);
_go.transform.localScale = new Vector3(10, 1, 10);
_go.transform.localPosition = new Vector3(0, 0, 0);
_go.GetComponent <MeshFilter>().mesh = PlaneGenerator.CreateFlatPlaneMesh(240, 240);
MyHeightTextureArray heightTextureArray =
new MyHeightTextureArray(240, 240, 2, TextureFormat.ARGB32, false, true);
heightTextureArray.AddElementArray(heightmap1, 0);
heightTextureArray.AddElementArray(new HeightmapArray(currentHeightArray.Array), 1);
_go.GetComponent <MeshRenderer>().material
.SetTexture("_HeightmapTexArray", heightTextureArray.ApplyAndRetrive());
MyHeightTextureArray waterArray = new MyHeightTextureArray(240, 240, debuggingOutput.WaterSnapshots.Count,
TextureFormat.ARGB32, false, true);
int i = 0;
foreach (var waterSnapshot in debuggingOutput.WaterSnapshots)
{
waterArray.AddElementArray(new HeightmapArray(waterSnapshot.Array), i);
i++;
}
_go.GetComponent <MeshRenderer>().material.SetTexture("_WaterArray", waterArray.ApplyAndRetrive());
MyHeightTextureArray sedimentArray = new MyHeightTextureArray(240, 240,
debuggingOutput.SedimentSnapshots.Count, TextureFormat.ARGB32, false, true);
int j = 0;
foreach (var sedimentSnapshot in debuggingOutput.SedimentSnapshots)
{
sedimentArray.AddElementArray(new HeightmapArray(sedimentSnapshot.Array), j);
j++;
}
_go.GetComponent <MeshRenderer>().material.SetTexture("_SedimentArray", sedimentArray.ApplyAndRetrive());
}
