mirror of
https://github.com/opensim/opensim.git
synced 2026-06-22 13:25:40 +08:00
108 lines
4.6 KiB
C#
108 lines
4.6 KiB
C#
/*
|
|
* Copyright (c) Contributors, http://opensimulator.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.
|
|
*
|
|
*/
|
|
|
|
namespace libTerrain
|
|
{
|
|
partial class Channel
|
|
{
|
|
/// <summary>
|
|
/// A thermal weathering implementation based on Musgrave's original 1989 algorithm. This is Adam's custom implementation which may differ slightly from the original.
|
|
/// </summary>
|
|
/// <param name="talus">The rock angle (represented as a dy/dx ratio) at which point it will be succeptible to breakage</param>
|
|
/// <param name="rounds">The number of erosion rounds</param>
|
|
/// <param name="c">The amount of rock to carry each round</param>
|
|
public Channel ThermalWeathering(double talus, int rounds, double c)
|
|
{
|
|
SetDiff();
|
|
|
|
double[,] lastFrame;
|
|
double[,] thisFrame;
|
|
|
|
lastFrame = (double[,]) map.Clone();
|
|
thisFrame = (double[,]) map.Clone();
|
|
|
|
NeighbourSystem type = NeighbourSystem.Moore;
|
|
// Using moore neighbourhood (twice as computationally expensive)
|
|
int NEIGHBOUR_ME = 4; // I am always 4 in both systems.
|
|
|
|
int NEIGHBOUR_MAX = type == NeighbourSystem.Moore ? 9 : 5;
|
|
|
|
int frames = rounds; // Number of thermal erosion iterations to run
|
|
int i, j;
|
|
int x, y;
|
|
|
|
for (i = 0; i < frames; i++)
|
|
{
|
|
for (x = 0; x < w; x++)
|
|
{
|
|
for (y = 0; y < h; y++)
|
|
{
|
|
for (j = 0; j < NEIGHBOUR_MAX; j++)
|
|
{
|
|
if (j != NEIGHBOUR_ME)
|
|
{
|
|
int[] coords = Neighbours(type, j);
|
|
|
|
coords[0] += x;
|
|
coords[1] += y;
|
|
|
|
if (coords[0] > w - 1)
|
|
coords[0] = w - 1;
|
|
if (coords[1] > h - 1)
|
|
coords[1] = h - 1;
|
|
if (coords[0] < 0)
|
|
coords[0] = 0;
|
|
if (coords[1] < 0)
|
|
coords[1] = 0;
|
|
|
|
double heightF = thisFrame[x, y];
|
|
double target = thisFrame[coords[0], coords[1]];
|
|
|
|
if (target > heightF + talus)
|
|
{
|
|
double calc = c*((target - heightF) - talus);
|
|
heightF += calc;
|
|
target -= calc;
|
|
}
|
|
|
|
thisFrame[x, y] = heightF;
|
|
thisFrame[coords[0], coords[1]] = target;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
lastFrame = (double[,]) thisFrame.Clone();
|
|
}
|
|
|
|
map = thisFrame;
|
|
|
|
Normalise(); // Just to guaruntee a smooth 0..1 value
|
|
return this;
|
|
}
|
|
}
|
|
} |