opensim – Blame information for rev 1
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1 | eva | 1 | /* |
2 | * Copyright (c) Contributors, http://opensimulator.org/ |
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3 | * See CONTRIBUTORS.TXT for a full list of copyright holders. |
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4 | * |
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5 | * Redistribution and use in source and binary forms, with or without |
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6 | * modification, are permitted provided that the following conditions are met: |
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7 | * * Redistributions of source code must retain the above copyright |
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8 | * notice, this list of conditions and the following disclaimer. |
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9 | * * Redistributions in binary form must reproduce the above copyright |
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10 | * notice, this list of conditions and the following disclaimer in the |
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11 | * documentation and/or other materials provided with the distribution. |
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12 | * * Neither the name of the OpenSimulator Project nor the |
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13 | * names of its contributors may be used to endorse or promote products |
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14 | * derived from this software without specific prior written permission. |
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15 | * |
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16 | * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY |
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17 | * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
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18 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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19 | * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY |
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20 | * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
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21 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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22 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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23 | * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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24 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
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25 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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26 | */ |
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27 | |||
28 | using System; |
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29 | using OpenSim.Region.Framework.Interfaces; |
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30 | using OpenSim.Region.Framework.Scenes; |
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31 | |||
32 | namespace OpenSim.Region.CoreModules.World.Terrain.PaintBrushes |
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33 | { |
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34 | /// <summary> |
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35 | /// Speed-Optimised Hybrid Erosion Brush |
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36 | /// |
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37 | /// As per Jacob Olsen's Paper |
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38 | /// http://www.oddlabs.com/download/terrain_generation.pdf |
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39 | /// </summary> |
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40 | public class OlsenSphere : ITerrainPaintableEffect |
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41 | { |
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42 | private const double nConst = 1024.0; |
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43 | private const NeighbourSystem type = NeighbourSystem.Moore; |
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44 | |||
45 | #region Supporting Functions |
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46 | |||
47 | private static int[] Neighbours(NeighbourSystem neighbourType, int index) |
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48 | { |
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49 | int[] coord = new int[2]; |
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50 | |||
51 | index++; |
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52 | |||
53 | switch (neighbourType) |
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54 | { |
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55 | case NeighbourSystem.Moore: |
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56 | switch (index) |
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57 | { |
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58 | case 1: |
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59 | coord[0] = -1; |
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60 | coord[1] = -1; |
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61 | break; |
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62 | |||
63 | case 2: |
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64 | coord[0] = -0; |
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65 | coord[1] = -1; |
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66 | break; |
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67 | |||
68 | case 3: |
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69 | coord[0] = +1; |
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70 | coord[1] = -1; |
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71 | break; |
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72 | |||
73 | case 4: |
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74 | coord[0] = -1; |
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75 | coord[1] = -0; |
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76 | break; |
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77 | |||
78 | case 5: |
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79 | coord[0] = -0; |
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80 | coord[1] = -0; |
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81 | break; |
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82 | |||
83 | case 6: |
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84 | coord[0] = +1; |
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85 | coord[1] = -0; |
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86 | break; |
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87 | |||
88 | case 7: |
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89 | coord[0] = -1; |
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90 | coord[1] = +1; |
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91 | break; |
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92 | |||
93 | case 8: |
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94 | coord[0] = -0; |
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95 | coord[1] = +1; |
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96 | break; |
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97 | |||
98 | case 9: |
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99 | coord[0] = +1; |
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100 | coord[1] = +1; |
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101 | break; |
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102 | |||
103 | default: |
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104 | break; |
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105 | } |
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106 | break; |
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107 | |||
108 | case NeighbourSystem.VonNeumann: |
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109 | switch (index) |
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110 | { |
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111 | case 1: |
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112 | coord[0] = 0; |
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113 | coord[1] = -1; |
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114 | break; |
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115 | |||
116 | case 2: |
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117 | coord[0] = -1; |
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118 | coord[1] = 0; |
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119 | break; |
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120 | |||
121 | case 3: |
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122 | coord[0] = +1; |
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123 | coord[1] = 0; |
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124 | break; |
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125 | |||
126 | case 4: |
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127 | coord[0] = 0; |
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128 | coord[1] = +1; |
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129 | break; |
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130 | |||
131 | case 5: |
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132 | coord[0] = -0; |
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133 | coord[1] = -0; |
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134 | break; |
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135 | |||
136 | default: |
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137 | break; |
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138 | } |
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139 | break; |
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140 | } |
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141 | |||
142 | return coord; |
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143 | } |
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144 | |||
145 | private enum NeighbourSystem |
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146 | { |
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147 | Moore, |
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148 | VonNeumann |
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149 | } ; |
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150 | |||
151 | #endregion |
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152 | |||
153 | #region ITerrainPaintableEffect Members |
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154 | |||
155 | public void PaintEffect(ITerrainChannel map, bool[,] mask, double rx, double ry, double rz, double strength, double duration) |
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156 | { |
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157 | strength = TerrainUtil.MetersToSphericalStrength(strength); |
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158 | |||
159 | int x; |
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160 | |||
161 | for (x = 0; x < map.Width; x++) |
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162 | { |
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163 | int y; |
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164 | for (y = 0; y < map.Height; y++) |
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165 | { |
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166 | if (!mask[x,y]) |
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167 | continue; |
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168 | |||
169 | double z = TerrainUtil.SphericalFactor(x, y, rx, ry, strength); |
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170 | |||
171 | if (z > 0) // add in non-zero amount |
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172 | { |
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173 | const int NEIGHBOUR_ME = 4; |
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174 | const int NEIGHBOUR_MAX = 9; |
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175 | |||
176 | double max = Double.MinValue; |
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177 | int loc = 0; |
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178 | |||
179 | |||
180 | for (int j = 0; j < NEIGHBOUR_MAX; j++) |
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181 | { |
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182 | if (j != NEIGHBOUR_ME) |
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183 | { |
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184 | int[] coords = Neighbours(type, j); |
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185 | |||
186 | coords[0] += x; |
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187 | coords[1] += y; |
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188 | |||
189 | if (coords[0] > map.Width - 1) |
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190 | continue; |
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191 | if (coords[1] > map.Height - 1) |
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192 | continue; |
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193 | if (coords[0] < 0) |
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194 | continue; |
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195 | if (coords[1] < 0) |
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196 | continue; |
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197 | |||
198 | double cellmax = map[x, y] - map[coords[0], coords[1]]; |
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199 | if (cellmax > max) |
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200 | { |
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201 | max = cellmax; |
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202 | loc = j; |
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203 | } |
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204 | } |
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205 | } |
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206 | |||
207 | double T = nConst / ((map.Width + map.Height) / 2.0); |
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208 | // Apply results |
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209 | if (0 < max && max <= T) |
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210 | { |
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211 | int[] maxCoords = Neighbours(type, loc); |
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212 | double heightDelta = 0.5 * max * z * duration; |
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213 | map[x, y] -= heightDelta; |
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214 | map[x + maxCoords[0], y + maxCoords[1]] += heightDelta; |
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215 | } |
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216 | } |
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217 | } |
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218 | } |
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219 | } |
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220 | |||
221 | #endregion |
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222 | } |
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223 | } |