diff options
author | Adam Frisby | 2008-04-30 21:22:29 +0000 |
---|---|---|
committer | Adam Frisby | 2008-04-30 21:22:29 +0000 |
commit | 4a8c1e4393ac64c84b03aeb16bacb9ddd0a2fae6 (patch) | |
tree | 49dde0575502e89aeed428b4190c68306e929b69 /OpenSim/Region/Environment/Modules/World/Terrain/TerrainUtil.cs | |
parent | * Previous commit managed to miss some files despite me hitting 'Select all'. (diff) | |
download | opensim-SC_OLD-4a8c1e4393ac64c84b03aeb16bacb9ddd0a2fae6.zip opensim-SC_OLD-4a8c1e4393ac64c84b03aeb16bacb9ddd0a2fae6.tar.gz opensim-SC_OLD-4a8c1e4393ac64c84b03aeb16bacb9ddd0a2fae6.tar.bz2 opensim-SC_OLD-4a8c1e4393ac64c84b03aeb16bacb9ddd0a2fae6.tar.xz |
* Commiting a bunch of missed files.
Diffstat (limited to 'OpenSim/Region/Environment/Modules/World/Terrain/TerrainUtil.cs')
-rw-r--r-- | OpenSim/Region/Environment/Modules/World/Terrain/TerrainUtil.cs | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/OpenSim/Region/Environment/Modules/World/Terrain/TerrainUtil.cs b/OpenSim/Region/Environment/Modules/World/Terrain/TerrainUtil.cs new file mode 100644 index 0000000..b593717 --- /dev/null +++ b/OpenSim/Region/Environment/Modules/World/Terrain/TerrainUtil.cs | |||
@@ -0,0 +1,133 @@ | |||
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 | |||
28 | using System; | ||
29 | using OpenSim.Region.Environment.Interfaces; | ||
30 | |||
31 | namespace OpenSim.Region.Environment.Modules.World.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 | ||