* Reimplemented Hydraulic Erosion routines, may be buggy.
Adam Frisby
parent
d72d1537e2
commit
8574c5476d
|
|
@ -1 +1,144 @@
|
||||||
/* Needs BSD rewrite */
|
/*
|
||||||
|
* Copyright (c) Contributors, http://www.openmetaverse.org/
|
||||||
|
* See CONTRIBUTORS.TXT for a full list of copyright holders.
|
||||||
|
*
|
||||||
|
* Redistribution and use in source and binary forms, with or without
|
||||||
|
* modification, are permitted provided that the following conditions are met:
|
||||||
|
* * Redistributions of source code must retain the above copyright
|
||||||
|
* notice, this list of conditions and the following disclaimer.
|
||||||
|
* * Redistributions in binary form must reproduce the above copyright
|
||||||
|
* notice, this list of conditions and the following disclaimer in the
|
||||||
|
* documentation and/or other materials provided with the distribution.
|
||||||
|
* * Neither the name of the OpenSim Project nor the
|
||||||
|
* names of its contributors may be used to endorse or promote products
|
||||||
|
* derived from this software without specific prior written permission.
|
||||||
|
*
|
||||||
|
* THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS AND ANY
|
||||||
|
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
||||||
|
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
||||||
|
* DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
|
||||||
|
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
||||||
|
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
|
||||||
|
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
|
||||||
|
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
||||||
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
||||||
|
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||||
|
*
|
||||||
|
*/
|
||||||
|
|
||||||
|
using System;
|
||||||
|
using System.Collections.Generic;
|
||||||
|
using System.Text;
|
||||||
|
|
||||||
|
namespace libTerrain
|
||||||
|
{
|
||||||
|
partial class Channel
|
||||||
|
{
|
||||||
|
public void hydraulicErosion(Channel rain, double evaporation, double solubility, int frequency, int rounds)
|
||||||
|
{
|
||||||
|
Channel water = new Channel(w, h);
|
||||||
|
Channel sediment = new Channel(w, h);
|
||||||
|
Channel terrain = this;
|
||||||
|
Channel waterFlow = new Channel(w, h);
|
||||||
|
|
||||||
|
NEIGHBOURS type = NEIGHBOURS.NEIGHBOUR_MOORE;
|
||||||
|
int NEIGHBOUR_ME = 4;
|
||||||
|
|
||||||
|
int NEIGHBOUR_MAX = type == NEIGHBOURS.NEIGHBOUR_MOORE ? 9 : 5;
|
||||||
|
|
||||||
|
for (int i = 0; i < rounds; i++)
|
||||||
|
{
|
||||||
|
water += rain;
|
||||||
|
|
||||||
|
sediment = terrain * water;
|
||||||
|
terrain -= sediment;
|
||||||
|
|
||||||
|
for (int x = 1; x < w - 1; x++)
|
||||||
|
{
|
||||||
|
for (int y = 1; y < h - 1; y++)
|
||||||
|
{
|
||||||
|
double[] heights = new double[NEIGHBOUR_MAX];
|
||||||
|
double[] diffs = new double[NEIGHBOUR_MAX];
|
||||||
|
|
||||||
|
double heightCenter = map[x, y];
|
||||||
|
|
||||||
|
for (int j = 0; j < NEIGHBOUR_MAX; j++)
|
||||||
|
{
|
||||||
|
if (j != NEIGHBOUR_ME)
|
||||||
|
{
|
||||||
|
int[] coords = neighbours(type, j);
|
||||||
|
coords[0] += x;
|
||||||
|
coords[1] += y;
|
||||||
|
|
||||||
|
heights[j] = map[coords[0], coords[1]] + water.map[coords[0], coords[1]] + sediment.map[coords[0], coords[1]];
|
||||||
|
diffs[j] = heightCenter - heights[j];
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
double totalHeight = 0;
|
||||||
|
double totalHeightDiff = 0;
|
||||||
|
int totalCellsCounted = 1;
|
||||||
|
|
||||||
|
for (int j = 0; j < NEIGHBOUR_MAX; j++)
|
||||||
|
{
|
||||||
|
if (j != NEIGHBOUR_ME)
|
||||||
|
{
|
||||||
|
if (diffs[j] > 0)
|
||||||
|
{
|
||||||
|
totalHeight += heights[j];
|
||||||
|
totalHeightDiff += diffs[j];
|
||||||
|
totalCellsCounted++;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
if (totalCellsCounted == 1)
|
||||||
|
continue;
|
||||||
|
|
||||||
|
double averageHeight = totalHeight / totalCellsCounted;
|
||||||
|
double waterAmount = Math.Min(water.map[x, y], heightCenter - averageHeight);
|
||||||
|
|
||||||
|
// TODO: Check this.
|
||||||
|
waterFlow.map[x, y] += waterFlow.map[x, y] - waterAmount;
|
||||||
|
|
||||||
|
double totalInverseDiff = waterAmount / totalHeightDiff;
|
||||||
|
|
||||||
|
for (int j = 0; j < NEIGHBOUR_MAX; j++)
|
||||||
|
{
|
||||||
|
if (j != NEIGHBOUR_ME)
|
||||||
|
{
|
||||||
|
int[] coords = neighbours(type, j);
|
||||||
|
coords[0] += x;
|
||||||
|
coords[1] += y;
|
||||||
|
|
||||||
|
if (diffs[j] > 0)
|
||||||
|
{
|
||||||
|
waterFlow.setWrap(coords[0], coords[1], waterFlow.map[coords[0], coords[1]] + diffs[j] * totalInverseDiff);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
water += waterFlow;
|
||||||
|
waterFlow.fill(0);
|
||||||
|
|
||||||
|
water *= evaporation;
|
||||||
|
|
||||||
|
for (int x = 0; x < w; x++)
|
||||||
|
{
|
||||||
|
for (int y = 0; y < h; y++)
|
||||||
|
{
|
||||||
|
double deposition = sediment.map[x, y] - water.map[x, y] * solubility;
|
||||||
|
if (deposition > 0)
|
||||||
|
{
|
||||||
|
sediment.map[x, y] -= deposition;
|
||||||
|
terrain.map[x, y] += deposition;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
Loading…
Reference in New Issue