1 | #include "SceneGraph.h"
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2 | #include "Exporter.h"
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3 | #include "UnigraphicsParser.h"
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4 | #include "X3dParser.h"
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5 | #include "Preprocessor.h"
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6 | #include "ViewCell.h"
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7 | #include "Environment.h"
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8 | #include "ViewCellsManager.h"
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9 | #include "ViewCellBsp.h"
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10 | #include "VspBspTree.h"
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11 | #include "VspKdTree.h"
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12 | #include "RenderSimulator.h"
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13 | #include "GlRenderer.h"
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14 | #include "PlyParser.h"
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15 |
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16 | namespace GtpVisibilityPreprocessor {
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17 |
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18 |
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19 | Preprocessor *preprocessor;
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20 |
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21 |
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22 | // HACK
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23 | static void AddGeometry(SceneGraph *scene)
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24 | {
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25 | scene->mRoot->UpdateBox();
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26 |
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27 | AxisAlignedBox3 sceneBox = scene->GetBox();
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28 |
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29 | int n = 200;
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30 |
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31 | if (0){
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32 | // form grid of boxes
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33 | for (int i = 0; i < n; ++ i)
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34 | {
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35 | for (int j = 0; j < n; ++ j)
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36 | {
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37 | const Vector3 scale2((float)j * 0.8 / n + 0.1, 0.05, (float)i * 0.8 / (float)n + 0.1);
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38 |
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39 | const Vector3 pt2 = sceneBox.Min() + scale2 * (sceneBox.Max() - sceneBox.Min());
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40 |
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41 | const Vector3 boxSize = sceneBox.Size() * Vector3(0.0025f, 0.01f, 0.0025f);
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42 | AxisAlignedBox3 box(pt2, pt2 + boxSize);
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43 | Mesh *mesh = CreateBox(box);
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44 |
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45 | mesh->Preprocess();
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46 |
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47 | MeshInstance *mi = new MeshInstance(mesh);
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48 | scene->mRoot->mGeometry.push_back(mi);
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49 | }
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50 | }
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51 |
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52 | for (int i = 0; i < n; ++ i)
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53 | {
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54 | for (int j = 0; j < n; ++ j)
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55 | {
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56 | const Vector3 scale2(0.15, (float)j * 0.8 / n + 0.1, (float)i * 0.8 / (float)n + 0.1);
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57 |
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58 | Vector3 pt2 = sceneBox.Min() + scale2 * (sceneBox.Max() - sceneBox.Min());
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59 |
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60 | Vector3 boxSize = sceneBox.Size() * Vector3(0.0025, 0.01, 0.0025);
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61 | AxisAlignedBox3 box(pt2, pt2 + boxSize);
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62 | Mesh *mesh = CreateBox(box);
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63 |
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64 | mesh->Preprocess();
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65 |
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66 | MeshInstance *mi = new MeshInstance(mesh);
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67 | scene->mRoot->mGeometry.push_back(mi);
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68 | }
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69 | }
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70 |
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71 | for (int i = 0; i < n; ++ i)
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72 | {
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73 | const Vector3 scale2(2, 0.2, (float)i * 0.8 / (float)n + 0.1);
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74 |
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75 | Vector3 pt2 = sceneBox.Min() + scale2 * (sceneBox.Max() - sceneBox.Min());
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76 |
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77 | //Vector3 boxSize = sceneBox.Size() * Vector3(0.0025, 0.01, 0.0025);
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78 | Vector3 boxSize = sceneBox.Size() * Vector3(0.005, 0.02, 0.005);
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79 | AxisAlignedBox3 box(pt2 + 0.1, pt2 + boxSize);
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80 | Mesh *mesh = CreateBox(box);
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81 |
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82 | mesh->Preprocess();
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83 |
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84 | MeshInstance *mi = new MeshInstance(mesh);
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85 | scene->mRoot->mGeometry.push_back(mi);
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86 | }
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87 |
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88 | scene->mRoot->UpdateBox();
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89 | }
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90 |
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91 | // plane separating view space regions
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92 | if (1)
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93 | {
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94 | const Vector3 scale(1.0, 0.0, 0);
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95 |
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96 | Vector3 pt = sceneBox.Min() + scale * (sceneBox.Max() - sceneBox.Min());
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97 |
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98 | Plane3 cuttingPlane(Vector3(1, 0, 0), pt);
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99 | Mesh *planeMesh = new Mesh();
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100 |
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101 | Polygon3 *poly = sceneBox.CrossSection(cuttingPlane);
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102 | IncludePolyInMesh(*poly, *planeMesh);
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103 |
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104 | planeMesh->Preprocess();
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105 |
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106 | MeshInstance *planeMi = new MeshInstance(planeMesh);
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107 | scene->mRoot->mGeometry.push_back(planeMi);
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108 | }
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109 | }
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110 |
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111 |
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112 | Preprocessor::Preprocessor():
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113 | mKdTree(NULL),
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114 | mBspTree(NULL),
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115 | mVspKdTree(NULL),
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116 | mVspBspTree(NULL),
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117 | mViewCellsManager(NULL)
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118 | {
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119 | environment->GetBoolValue("Preprocessor.useGlRenderer", mUseGlRenderer);
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120 |
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121 | // renderer will be constructed when the scene graph and viewcell manager will be known
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122 | renderer = NULL;
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123 |
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124 | environment->GetBoolValue("Preprocessor.useGlDebugger", mUseGlDebugger);
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125 | environment->GetBoolValue("Preprocessor.loadPolygonsAsMeshes", mLoadPolygonsAsMeshes);
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126 | environment->GetBoolValue("Preprocessor.quitOnFinish", mQuitOnFinish);
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127 | environment->GetBoolValue("Preprocessor.computeVisibility", mComputeVisibility);
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128 | environment->GetBoolValue("Preprocessor.detectEmptyViewSpace", mDetectEmptyViewSpace);
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129 | environment->GetBoolValue("Preprocessor.exportVisibility", mExportVisibility );
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130 |
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131 | char buffer[256];
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132 | environment->GetStringValue("Preprocessor.visibilityFile", buffer);
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133 | mVisibilityFileName = buffer;
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134 | environment->GetBoolValue("Preprocessor.visibilityFile", mApplyVisibilityFilter );
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135 |
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136 | Debug << "detect empty view space=" << mDetectEmptyViewSpace << endl;
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137 | Debug << "load polygons as meshes: " << mLoadPolygonsAsMeshes << endl;
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138 | }
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139 |
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140 |
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141 | Preprocessor::~Preprocessor()
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142 | {
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143 | cout << "cleaning up" << endl;
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144 |
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145 | cout << "Deleting view cells manager ... \n";
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146 | DEL_PTR(mViewCellsManager);
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147 | cout << "done.\n";
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148 |
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149 | cout << "Deleting bsp tree ... \n";
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150 | DEL_PTR(mBspTree);
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151 | cout << "done.\n";
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152 |
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153 | cout << "Deleting kd tree...\n";
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154 | DEL_PTR(mKdTree);
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155 | cout << "done.\n";
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156 |
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157 | cout << "Deleting vspkd tree...\n";
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158 | DEL_PTR(mVspKdTree);
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159 | cout << "done.\n";
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160 |
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161 | cout << "Deleting vspbsp tree...\n";
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162 | DEL_PTR(mVspBspTree);
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163 | cout << "done.\n";
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164 | }
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165 |
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166 | int
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167 | SplitFilenames(const string str, vector<string> &filenames)
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168 | {
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169 | int pos = 0;
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170 |
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171 | while(1) {
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172 | int npos = (int)str.find(';', pos);
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173 |
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174 | if (npos < 0 || npos - pos < 1)
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175 | break;
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176 | filenames.push_back(string(str, pos, npos - pos));
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177 | pos = npos + 1;
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178 | }
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179 |
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180 | filenames.push_back(string(str, pos, str.size() - pos));
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181 | return (int)filenames.size();
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182 | }
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183 |
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184 |
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185 | bool
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186 | Preprocessor::LoadScene(const string filename)
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187 | {
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188 | // use leaf nodes of the original spatial hiearrchy as occludees
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189 | mSceneGraph = new SceneGraph;
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190 |
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191 | Parser *parser;
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192 | vector<string> filenames;
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193 | int files = SplitFilenames(filename, filenames);
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194 | cout << "number of input files: " << files << endl;
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195 | bool result = false;
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196 | if (files == 1) {
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197 |
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198 | if (strstr(filename.c_str(), ".x3d"))
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199 | parser = new X3dParser;
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200 | else
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201 | if (strstr(filename.c_str(), ".ply") || strstr(filename.c_str(), ".plb"))
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202 | parser = new PlyParser;
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203 | else
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204 | parser = new UnigraphicsParser;
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205 |
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206 | cout<<filename<<endl;
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207 | result = parser->ParseFile(filename, &mSceneGraph->mRoot, mLoadPolygonsAsMeshes);
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208 |
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209 | delete parser;
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210 |
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211 | } else {
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212 | // root for different files
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213 | mSceneGraph->mRoot = new SceneGraphNode;
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214 | for (int i= 0; i < filenames.size(); i++) {
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215 | if (strstr(filenames[i].c_str(), ".x3d"))
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216 | parser = new X3dParser;
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217 | else
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218 | parser = new UnigraphicsParser;
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219 |
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220 | SceneGraphNode *node;
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221 | if (parser->ParseFile(filenames[i], &node)) {
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222 | mSceneGraph->mRoot->mChildren.push_back(node);
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223 | // at least one file parsed
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224 | result = true;
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225 | }
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226 | delete parser;
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227 | }
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228 | }
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229 |
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230 |
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231 | if (result)
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232 | {
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233 | // HACK
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234 | //AddGeometry(mSceneGraph);
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235 | mSceneGraph->AssignObjectIds();
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236 |
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237 | int intersectables, faces;
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238 | mSceneGraph->GetStatistics(intersectables, faces);
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239 |
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240 | cout<<filename<<" parsed successfully."<<endl;
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241 | cout<<"#NUM_OBJECTS (Total numner of objects)\n"<<intersectables<<endl;
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242 | cout<<"#NUM_FACES (Total numner of faces)\n"<<faces<<endl;
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243 | mSceneGraph->CollectObjects(&mObjects);
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244 | mSceneGraph->mRoot->UpdateBox();
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245 |
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246 | /* Exporter *exporter = Exporter::GetExporter("testload.x3d");
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247 |
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248 | if (exporter)
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249 | {
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250 | exporter->ExportGeometry(mObjects);
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251 | delete exporter;
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252 | }*/
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253 |
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254 | }
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255 |
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256 |
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257 | return result;
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258 | }
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259 |
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260 | bool
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261 | Preprocessor::ExportPreprocessedData(const string filename)
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262 | {
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263 |
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264 | mViewCellsManager->ExportViewCells(filename,
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265 | true);
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266 |
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267 | return true;
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268 | }
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269 |
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270 | bool
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271 | Preprocessor::PostProcessVisibility()
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272 | {
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273 |
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274 | if (mApplyVisibilityFilter) {
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275 | cout<<"Applying visibility filter...";
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276 | mViewCellsManager->ApplyFilter(mKdTree,
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277 | 0.05f,
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278 | 0.05f);
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279 | cout<<"done.";
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280 | }
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281 |
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282 | // export the preprocessed information to a file
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283 | if (mExportVisibility)
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284 | ExportPreprocessedData(mVisibilityFileName);
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285 |
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286 | return true;
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287 | }
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288 |
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289 |
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290 | bool
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291 | Preprocessor::BuildKdTree()
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292 | {
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293 | mKdTree = new KdTree;
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294 | // add mesh instances of the scene graph to the root of the tree
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295 | KdLeaf *root = (KdLeaf *)mKdTree->GetRoot();
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296 | mSceneGraph->CollectObjects(&root->mObjects);
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297 |
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298 | mKdTree->Construct();
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299 | return true;
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300 | }
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301 |
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302 | void
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303 | Preprocessor::KdTreeStatistics(ostream &s)
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304 | {
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305 | s<<mKdTree->GetStatistics();
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306 | }
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307 |
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308 | void
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309 | Preprocessor::BspTreeStatistics(ostream &s)
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310 | {
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311 | s << mBspTree->GetStatistics();
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312 | }
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313 |
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314 | bool
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315 | Preprocessor::Export( const string filename,
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316 | const bool scene,
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317 | const bool kdtree,
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318 | const bool bsptree
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319 | )
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320 | {
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321 | Exporter *exporter = Exporter::GetExporter(filename);
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322 |
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323 | if (exporter) {
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324 | if (scene)
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325 | exporter->ExportScene(mSceneGraph->mRoot);
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326 |
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327 | if (kdtree) {
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328 | exporter->SetWireframe();
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329 | exporter->ExportKdTree(*mKdTree);
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330 | }
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331 |
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332 | if (bsptree) {
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333 | //exporter->SetWireframe();
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334 | exporter->ExportBspTree(*mBspTree);
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335 | }
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336 |
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337 | delete exporter;
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338 | return true;
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339 | }
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340 |
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341 | return false;
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342 | }
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343 |
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344 |
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345 | bool Preprocessor::PrepareViewCells()
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346 | {
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347 | //-- parse view cells construction method
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348 | environment->GetBoolValue("ViewCells.loadFromFile", mLoadViewCells);
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349 | char buf[100];
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350 |
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351 | if (mLoadViewCells)
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352 | {
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353 | environment->GetStringValue("ViewCells.filename", buf);
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354 | mViewCellsManager = ViewCellsManager::LoadViewCells(buf, &mObjects);
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355 | }
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356 | else
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357 | {
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358 | //-- parse type of view cell container
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359 | char viewCellsStr[64];
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360 | environment->GetStringValue("ViewCells.type", viewCellsStr);
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361 | mViewCellsManager = CreateViewCellsManager(viewCellsStr);
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362 | }
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363 |
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364 | float objRenderCost = 0, vcOverhead = 0, moveSpeed = 0;
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365 |
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366 | environment->GetFloatValue("Simulation.objRenderCost",objRenderCost);
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367 | environment->GetFloatValue("Simulation.vcOverhead", vcOverhead);
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368 | environment->GetFloatValue("Simulation.moveSpeed", moveSpeed);
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369 |
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370 | mRenderSimulator =
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371 | new RenderSimulator(mViewCellsManager, objRenderCost, vcOverhead, moveSpeed);
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372 |
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373 | mViewCellsManager->SetRenderer(mRenderSimulator);
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374 |
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375 |
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376 | if (mUseGlRenderer || mUseGlDebugger)
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377 | {
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378 | // NOTE: render texture should be power of 2 and square
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379 | // renderer must be initialised
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380 | renderer = new GlRendererBuffer(1024, 768, mSceneGraph, mViewCellsManager, mKdTree);
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381 | // renderer->makeCurrent();
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382 |
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383 | }
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384 |
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385 | return true;
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386 | }
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387 |
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388 |
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389 | ViewCellsManager *Preprocessor::CreateViewCellsManager(const char *name)
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390 | {
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391 | if (strcmp(name, "kdTree") == 0)
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392 | {
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393 | mViewCellsManager = new KdViewCellsManager(mKdTree);
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394 | }
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395 | else if (strcmp(name, "bspTree") == 0)
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396 | {
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397 | Debug << "view cell type: Bsp" << endl;
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398 |
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399 | mBspTree = new BspTree();
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400 | mViewCellsManager = new BspViewCellsManager(mBspTree);
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401 | }
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402 | else if (strcmp(name, "vspBspTree") == 0)
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403 | {
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404 | Debug << "view cell type: VspBsp" << endl;
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405 |
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406 | mVspBspTree = new VspBspTree(environment);
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407 | mViewCellsManager = new VspBspViewCellsManager(mVspBspTree);
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408 | }
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409 | else if (strcmp(name, "vspKdTree") == 0)
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410 | {
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411 | mVspKdTree = new VspKdTree();
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412 |
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413 | mViewCellsManager = new VspKdViewCellsManager(mVspKdTree);
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414 | }
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415 | else if (strcmp(name, "sceneDependent") == 0)
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416 | {
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417 | //TODO
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418 | mBspTree = new BspTree();
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419 |
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420 | Debug << "view cell type: Bsp" << endl;
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421 |
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422 | mViewCellsManager = new BspViewCellsManager(mBspTree);
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423 | }
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424 | else
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425 | {
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426 | cerr << "Wrong view cells type " << name << "!!!" << endl;
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427 | exit(1);
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428 | }
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429 |
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430 | return mViewCellsManager;
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431 | }
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432 |
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433 |
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434 | // use ascii format to store rays
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435 | #define USE_ASCII 0
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436 |
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437 |
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438 | inline bool ilt(Intersectable *obj1, Intersectable *obj2)
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439 | {
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440 | return obj1->mId < obj2->mId;
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441 | }
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442 |
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443 |
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444 | bool Preprocessor::LoadSamples(VssRayContainer &samples,
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445 | ObjectContainer &objects) const
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446 | {
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447 | std::stable_sort(objects.begin(), objects.end(), ilt);
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448 | char fileName[100];
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449 | environment->GetStringValue("Preprocessor.samplesFilename", fileName);
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450 |
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451 | Vector3 origin, termination;
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452 | // HACK: needed only for lower_bound algorithm to find the
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453 | // intersected objects
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454 | MeshInstance sObj(NULL);
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455 | MeshInstance tObj(NULL);
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456 |
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457 | #if USE_ASCII
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458 | ifstream samplesIn(fileName);
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459 | if (!samplesIn.is_open())
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460 | return false;
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461 |
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462 | string buf;
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463 | while (!(getline(samplesIn, buf)).eof())
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464 | {
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465 | sscanf(buf.c_str(), "%f %f %f %f %f %f %d %d",
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466 | &origin.x, &origin.y, &origin.z,
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467 | &termination.x, &termination.y, &termination.z,
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468 | &(sObj.mId), &(tObj.mId));
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469 |
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470 | Intersectable *sourceObj = NULL;
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471 | Intersectable *termObj = NULL;
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472 |
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473 | if (sObj.mId >= 0)
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474 | {
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475 | ObjectContainer::iterator oit =
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476 | lower_bound(objects.begin(), objects.end(), &sObj, ilt);
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477 | sourceObj = *oit;
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478 | }
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479 |
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480 | if (tObj.mId >= 0)
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481 | {
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482 | ObjectContainer::iterator oit =
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483 | lower_bound(objects.begin(), objects.end(), &tObj, ilt);
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484 | termObj = *oit;
|
---|
485 | }
|
---|
486 |
|
---|
487 | samples.push_back(new VssRay(origin, termination, sourceObj, termObj));
|
---|
488 | }
|
---|
489 | #else
|
---|
490 | ifstream samplesIn(fileName, ios::binary);
|
---|
491 | if (!samplesIn.is_open())
|
---|
492 | return false;
|
---|
493 |
|
---|
494 | while (1)
|
---|
495 | {
|
---|
496 | samplesIn.read(reinterpret_cast<char *>(&origin), sizeof(Vector3));
|
---|
497 | samplesIn.read(reinterpret_cast<char *>(&termination), sizeof(Vector3));
|
---|
498 | samplesIn.read(reinterpret_cast<char *>(&(sObj.mId)), sizeof(int));
|
---|
499 | samplesIn.read(reinterpret_cast<char *>(&(tObj.mId)), sizeof(int));
|
---|
500 |
|
---|
501 | if (samplesIn.eof())
|
---|
502 | break;
|
---|
503 |
|
---|
504 | Intersectable *sourceObj = NULL;
|
---|
505 | Intersectable *termObj = NULL;
|
---|
506 |
|
---|
507 | if (sObj.mId >= 0)
|
---|
508 | {
|
---|
509 | ObjectContainer::iterator oit =
|
---|
510 | lower_bound(objects.begin(), objects.end(), &sObj, ilt);
|
---|
511 | sourceObj = *oit;
|
---|
512 | }
|
---|
513 |
|
---|
514 | if (tObj.mId >= 0)
|
---|
515 | {
|
---|
516 | ObjectContainer::iterator oit =
|
---|
517 | lower_bound(objects.begin(), objects.end(), &tObj, ilt);
|
---|
518 | termObj = *oit;
|
---|
519 | }
|
---|
520 |
|
---|
521 | samples.push_back(new VssRay(origin, termination, sourceObj, termObj));
|
---|
522 | }
|
---|
523 |
|
---|
524 | #endif
|
---|
525 | samplesIn.close();
|
---|
526 |
|
---|
527 | return true;
|
---|
528 | }
|
---|
529 |
|
---|
530 |
|
---|
531 | bool Preprocessor::ExportSamples(const VssRayContainer &samples) const
|
---|
532 | {
|
---|
533 | char fileName[100];
|
---|
534 | environment->GetStringValue("Preprocessor.samplesFilename", fileName);
|
---|
535 |
|
---|
536 |
|
---|
537 | VssRayContainer::const_iterator it, it_end = samples.end();
|
---|
538 |
|
---|
539 | #if USE_ASCII
|
---|
540 | ofstream samplesOut(fileName);
|
---|
541 | if (!samplesOut.is_open())
|
---|
542 | return false;
|
---|
543 |
|
---|
544 | for (it = samples.begin(); it != it_end; ++ it)
|
---|
545 | {
|
---|
546 | VssRay *ray = *it;
|
---|
547 | int sourceid = ray->mOriginObject ? ray->mOriginObject->mId : -1;
|
---|
548 | int termid = ray->mTerminationObject ? ray->mTerminationObject->mId : -1;
|
---|
549 |
|
---|
550 | samplesOut << ray->GetOrigin().x << " " << ray->GetOrigin().y << " " << ray->GetOrigin().z << " "
|
---|
551 | << ray->GetTermination().x << " " << ray->GetTermination().y << " " << ray->GetTermination().z << " "
|
---|
552 | << sourceid << " " << termid << "\n";
|
---|
553 | }
|
---|
554 | #else
|
---|
555 | ofstream samplesOut(fileName, ios::binary);
|
---|
556 | if (!samplesOut.is_open())
|
---|
557 | return false;
|
---|
558 |
|
---|
559 | for (it = samples.begin(); it != it_end; ++ it)
|
---|
560 | {
|
---|
561 | VssRay *ray = *it;
|
---|
562 | Vector3 origin(ray->GetOrigin());
|
---|
563 | Vector3 termination(ray->GetTermination());
|
---|
564 |
|
---|
565 | int sourceid = ray->mOriginObject ? ray->mOriginObject->mId : -1;
|
---|
566 | int termid = ray->mTerminationObject ? ray->mTerminationObject->mId : -1;
|
---|
567 |
|
---|
568 | samplesOut.write(reinterpret_cast<char *>(&origin), sizeof(Vector3));
|
---|
569 | samplesOut.write(reinterpret_cast<char *>(&termination), sizeof(Vector3));
|
---|
570 | samplesOut.write(reinterpret_cast<char *>(&sourceid), sizeof(int));
|
---|
571 | samplesOut.write(reinterpret_cast<char *>(&termid), sizeof(int));
|
---|
572 | }
|
---|
573 | #endif
|
---|
574 | samplesOut.close();
|
---|
575 | return true;
|
---|
576 | }
|
---|
577 |
|
---|
578 |
|
---|
579 |
|
---|
580 | bool
|
---|
581 | Preprocessor::GenerateRays(
|
---|
582 | const int number,
|
---|
583 | const int sampleType,
|
---|
584 | SimpleRayContainer &rays
|
---|
585 | )
|
---|
586 | {
|
---|
587 | Vector3 origin, direction;
|
---|
588 | int startSize = (int)rays.size();
|
---|
589 | for (int i=0; (int)rays.size() - startSize < number; i ++) {
|
---|
590 | // now get the direction
|
---|
591 | switch (sampleType) {
|
---|
592 | case OBJECT_BASED_DISTRIBUTION: {
|
---|
593 | mViewCellsManager->GetViewPoint(origin);
|
---|
594 | Vector3 point;
|
---|
595 | Vector3 normal;
|
---|
596 | int i = RandomValue(0, mObjects.size() - 1);
|
---|
597 | Intersectable *object = mObjects[i];
|
---|
598 | object->GetRandomSurfacePoint(point, normal);
|
---|
599 | direction = point - origin;
|
---|
600 | }
|
---|
601 | break;
|
---|
602 | case OBJECT_DIRECTION_BASED_DISTRIBUTION: {
|
---|
603 | int i = RandomValue(0, mObjects.size() - 1);
|
---|
604 | Intersectable *object = mObjects[i];
|
---|
605 | Vector3 normal;
|
---|
606 | object->GetRandomSurfacePoint(origin, normal);
|
---|
607 | direction = UniformRandomVector(normal);
|
---|
608 | origin += 0.1f*direction;
|
---|
609 | }
|
---|
610 | break;
|
---|
611 | case DIRECTION_BASED_DISTRIBUTION:
|
---|
612 | mViewCellsManager->GetViewPoint(origin);
|
---|
613 | direction = UniformRandomVector();
|
---|
614 | break;
|
---|
615 | case DIRECTION_BOX_BASED_DISTRIBUTION: {
|
---|
616 | mViewCellsManager->GetViewPoint(origin);
|
---|
617 | float alpha = RandomValue(0.0f, 2*M_PI);
|
---|
618 | float beta = RandomValue(-M_PI/2, M_PI/2);
|
---|
619 | direction = VssRay::GetDirection(alpha, beta);
|
---|
620 | break;
|
---|
621 | }
|
---|
622 | case SPATIAL_BOX_BASED_DISTRIBUTION:
|
---|
623 | mViewCellsManager->GetViewPoint(origin);
|
---|
624 | direction = mKdTree->GetBox().GetRandomPoint() - origin;
|
---|
625 | break;
|
---|
626 | default:
|
---|
627 | // unsuported distribution type
|
---|
628 | return false;
|
---|
629 | }
|
---|
630 | // $$ jb the pdf is yet not correct for all sampling methods!
|
---|
631 | float pdf = 1.0f;
|
---|
632 | float c = Magnitude(direction);
|
---|
633 | if (c > Limits::Small) {
|
---|
634 | direction*=1.0f/c;
|
---|
635 | rays.AddRay(SimpleRay(origin, direction, pdf));
|
---|
636 | }
|
---|
637 | }
|
---|
638 | return true;
|
---|
639 | }
|
---|
640 |
|
---|
641 | } |
---|