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authorAdam Frisby2008-04-30 21:16:36 +0000
committerAdam Frisby2008-04-30 21:16:36 +0000
commitf5c312bc3c2567449c7268a54a08a54119f58d53 (patch)
tree424668a4bbec6873ebc5b8256f3671db102f5e9c /OpenSim/Region/Environment/Modules/Terrain/TerrainUtil.cs
parent* Adds the AuthbuyerID field to sqlite and makes use of it. (diff)
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* Refactored Environment/Modules directory - modules now reside in their own directory with any associated module-specific classes.
* Each module directory is currently inside one of the following category folders: Agent (Anything relating to do with Client<->Server communications.), Avatar (Anything to do with the avatar or presence inworld), Framework (Classes modules can use), Grid (Grid traffic, new OGS2 grid comms), Scripting (Scripting functions, etc), World (The enrivonment/scene, IE Sun/Tree modules.) * This should be moved into a seperate project file.
Diffstat (limited to '')
-rw-r--r--OpenSim/Region/Environment/Modules/Terrain/TerrainUtil.cs133
1 files changed, 0 insertions, 133 deletions
diff --git a/OpenSim/Region/Environment/Modules/Terrain/TerrainUtil.cs b/OpenSim/Region/Environment/Modules/Terrain/TerrainUtil.cs
deleted file mode 100644
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--- a/OpenSim/Region/Environment/Modules/Terrain/TerrainUtil.cs
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@@ -1,133 +0,0 @@
1/*
2 * Copyright (c) Contributors, http://opensimulator.org/
3 * See CONTRIBUTORS.TXT for a full list of copyright holders.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 * * Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * * Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * * Neither the name of the OpenSim Project nor the
13 * names of its contributors may be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
17 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
19 * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
20 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
21 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
23 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
25 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28using System;
29using OpenSim.Region.Environment.Interfaces;
30
31namespace OpenSim.Region.Environment.Modules.Terrain
32{
33 public static class TerrainUtil
34 {
35 public static double MetersToSphericalStrength(double size)
36 {
37 return Math.Pow(2, size);
38 }
39
40 public static double SphericalFactor(double x, double y, double rx, double ry, double size)
41 {
42 return size * size - ((x - rx) * (x - rx) + (y - ry) * (y - ry));
43 }
44
45 public static double GetBilinearInterpolate(double x, double y, ITerrainChannel map)
46 {
47 int w = map.Width;
48 int h = map.Height;
49
50 if (x > w - 2.0)
51 x = w - 2.0;
52 if (y > h - 2.0)
53 y = h - 2.0;
54 if (x < 0.0)
55 x = 0.0;
56 if (y < 0.0)
57 y = 0.0;
58
59 int stepSize = 1;
60 double h00 = map[(int) x, (int) y];
61 double h10 = map[(int) x + stepSize, (int) y];
62 double h01 = map[(int) x, (int) y + stepSize];
63 double h11 = map[(int) x + stepSize, (int) y + stepSize];
64 double h1 = h00;
65 double h2 = h10;
66 double h3 = h01;
67 double h4 = h11;
68 double a00 = h1;
69 double a10 = h2 - h1;
70 double a01 = h3 - h1;
71 double a11 = h1 - h2 - h3 + h4;
72 double partialx = x - (int) x;
73 double partialz = y - (int) y;
74 double hi = a00 + (a10 * partialx) + (a01 * partialz) + (a11 * partialx * partialz);
75 return hi;
76 }
77
78 private static double Noise(double x, double y)
79 {
80 int n = (int) x + (int) (y * 749);
81 n = (n << 13) ^ n;
82 return (1.0 - ((n * (n * n * 15731 + 789221) + 1376312589) & 0x7fffffff) / 1073741824.0);
83 }
84
85 private static double SmoothedNoise1(double x, double y)
86 {
87 double corners = (Noise(x - 1, y - 1) + Noise(x + 1, y - 1) + Noise(x - 1, y + 1) + Noise(x + 1, y + 1)) / 16;
88 double sides = (Noise(x - 1, y) + Noise(x + 1, y) + Noise(x, y - 1) + Noise(x, y + 1)) / 8;
89 double center = Noise(x, y) / 4;
90 return corners + sides + center;
91 }
92
93 private static double Interpolate(double x, double y, double z)
94 {
95 return (x * (1.0 - z)) + (y * z);
96 }
97
98 private static double InterpolatedNoise(double x, double y)
99 {
100 int integer_X = (int) (x);
101 double fractional_X = x - integer_X;
102
103 int integer_Y = (int) y;
104 double fractional_Y = y - integer_Y;
105
106 double v1 = SmoothedNoise1(integer_X, integer_Y);
107 double v2 = SmoothedNoise1(integer_X + 1, integer_Y);
108 double v3 = SmoothedNoise1(integer_X, integer_Y + 1);
109 double v4 = SmoothedNoise1(integer_X + 1, integer_Y + 1);
110
111 double i1 = Interpolate(v1, v2, fractional_X);
112 double i2 = Interpolate(v3, v4, fractional_X);
113
114 return Interpolate(i1, i2, fractional_Y);
115 }
116
117 public static double PerlinNoise2D(double x, double y, int octaves, double persistence)
118 {
119 double frequency = 0.0;
120 double amplitude = 0.0;
121 double total = 0.0;
122
123 for (int i = 0; i < octaves; i++)
124 {
125 frequency = Math.Pow(2, i);
126 amplitude = Math.Pow(persistence, i);
127
128 total += InterpolatedNoise(x * frequency, y * frequency) * amplitude;
129 }
130 return total;
131 }
132 }
133} \ No newline at end of file