1 files changed, 113 insertions, 0 deletions
diff --git a/OpenSim/Region/Terrain.BasicTerrain/libTerrainBSD/Channel/Manipulators/ThermalWeathering.cs b/OpenSim/Region/Terrain.BasicTerrain/libTerrainBSD/Channel/Manipulators/ThermalWeathering.cs
new file mode 100644
index 0000000..0cae56d
--- /dev/null
+++ b/OpenSim/Region/Terrain.BasicTerrain/libTerrainBSD/Channel/Manipulators/ThermalWeathering.cs
@@ -0,0 +1,113 @@
+/*
+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 libTerrain 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 COPYRIGHT HOLDERS AND CONTRIBUTORS
+"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 COPYRIGHT
+OWNER OR 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
+    {
+        /// <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)
+        {
+            double[,] lastFrame;
+            double[,] thisFrame;
+            lastFrame = (double[,])map.Clone();
+            thisFrame = (double[,])map.Clone();
+            NEIGHBOURS type = NEIGHBOURS.NEIGHBOUR_MOORE; // Using moore neighbourhood (twice as computationally expensive)
+            int NEIGHBOUR_ME = 4; // I am always 4 in both systems.
+            int NEIGHBOUR_MAX = type == NEIGHBOURS.NEIGHBOUR_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;
+        }
+    }
+}

diff --git a/OpenSim/Region/Terrain.BasicTerrain/libTerrainBSD/Channel/Manipulators/ThermalWeathering.cs b/OpenSim/Region/Terrain.BasicTerrain/libTerrainBSD/Channel/Manipulators/ThermalWeathering.cs new file mode 100644 index 0000000..0cae56d --- /dev/null +++ b/OpenSim/Region/Terrain.BasicTerrain/libTerrainBSD/Channel/Manipulators/ThermalWeathering.cs
@@ -0,0 +1,113 @@
	1	/*
	2	Redistribution and use in source and binary forms, with or without
	3	modification, are permitted provided that the following conditions are
	4	met:
	5
	6	* Redistributions of source code must retain the above copyright
	7	notice, this list of conditions and the following disclaimer.
	8
	9	* Redistributions in binary form must reproduce the above
	10	copyright notice, this list of conditions and the following
	11	disclaimer in the documentation and/or other materials provided
	12	with the distribution.
	13
	14	* Neither the name of libTerrain nor the names of
	15	its contributors may be used to endorse or promote products
	16	derived from this software without specific prior written
	17	permission.
	18
	19	THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	20	"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	21	LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
	22	A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	23	OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	24	SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	25	LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	26	DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	27	THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	28	(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	29	OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	30	*/
	31
	32	using System;
	33	using System.Collections.Generic;
	34	using System.Text;
	35
	36	namespace libTerrain
	37	{
	38	partial class Channel
	39	{
	40	/// <summary>
	41	/// A thermal weathering implementation based on Musgrave's original 1989 algorithm. This is Adam's custom implementation which may differ slightly from the original.
	42	/// </summary>
	43	/// <param name="talus">The rock angle (represented as a dy/dx ratio) at which point it will be succeptible to breakage</param>
	44	/// <param name="rounds">The number of erosion rounds</param>
	45	/// <param name="c">The amount of rock to carry each round</param>
	46	public Channel thermalWeathering(double talus, int rounds, double c)
	47	{
	48	double[,] lastFrame;
	49	double[,] thisFrame;
	50
	51	lastFrame = (double[,])map.Clone();
	52	thisFrame = (double[,])map.Clone();
	53
	54	NEIGHBOURS type = NEIGHBOURS.NEIGHBOUR_MOORE; // Using moore neighbourhood (twice as computationally expensive)
	55	int NEIGHBOUR_ME = 4; // I am always 4 in both systems.
	56
	57	int NEIGHBOUR_MAX = type == NEIGHBOURS.NEIGHBOUR_MOORE ? 9 : 5;
	58
	59	int frames = rounds; // Number of thermal erosion iterations to run
	60	int i, j;
	61	int x, y;
	62
	63	for (i = 0; i < frames; i++)
	64	{
	65	for (x = 0; x < w; x++)
	66	{
	67	for (y = 0; y < h; y++)
	68	{
	69	for (j = 0; j < NEIGHBOUR_MAX; j++)
	70	{
	71	if (j != NEIGHBOUR_ME)
	72	{
	73	int[] coords = neighbours(type, j);
	74
	75	coords[0] += x;
	76	coords[1] += y;
	77
	78	if (coords[0] > w - 1)
	79	coords[0] = w - 1;
	80	if (coords[1] > h - 1)
	81	coords[1] = h - 1;
	82	if (coords[0] < 0)
	83	coords[0] = 0;
	84	if (coords[1] < 0)
	85	coords[1] = 0;
	86
	87	double heightF = thisFrame[x, y];
	88	double target = thisFrame[coords[0], coords[1]];
	89
	90	if (target > heightF + talus)
	91	{
	92	double calc = c * ((target - heightF) - talus);
	93	heightF += calc;
	94	target -= calc;
	95	}
	96
	97	thisFrame[x, y] = heightF;
	98	thisFrame[coords[0], coords[1]] = target;
	99
	100	}
	101	}
	102	}
	103	}
	104	lastFrame = (double[,])thisFrame.Clone();
	105	}
	106
	107	map = thisFrame;
	108
	109	normalise(); // Just to guaruntee a smooth 0..1 value
	110	return this;
	111	}
	112	}
	113	}