1 | /* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield |
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2 | * |
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3 | * This library is open source and may be redistributed and/or modified under |
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4 | * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or |
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5 | * (at your option) any later version. The full license is in LICENSE file |
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6 | * included with this distribution, and on the openscenegraph.org website. |
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7 | * |
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8 | * This library is distributed in the hope that it will be useful, |
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9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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11 | * OpenSceneGraph Public License for more details. |
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12 | */ |
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13 | |
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14 | #ifndef OSG_KDTREE |
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15 | #define OSG_KDTREE 1 |
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16 | |
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17 | #include <osg/Shape> |
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18 | #include <osg/Geometry> |
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19 | |
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20 | #include <map> |
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21 | |
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22 | namespace osg |
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23 | { |
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24 | |
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25 | /** Implementation of a kdtree for Geometry leaves, to enable fast intersection tests.*/ |
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26 | class OSG_EXPORT KdTree : public osg::Shape |
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27 | { |
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28 | public: |
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29 | |
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30 | |
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31 | KdTree(); |
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32 | |
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33 | KdTree(const KdTree& rhs, const osg::CopyOp& copyop=osg::CopyOp::SHALLOW_COPY); |
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34 | |
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35 | META_Shape(osg, KdTree) |
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36 | |
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37 | struct OSG_EXPORT BuildOptions |
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38 | { |
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39 | BuildOptions(); |
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40 | |
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41 | unsigned int _numVerticesProcessed; |
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42 | unsigned int _targetNumTrianglesPerLeaf; |
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43 | unsigned int _maxNumLevels; |
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44 | }; |
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45 | |
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46 | |
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47 | /** Build the kdtree from the specified source geometry object. |
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48 | * retun true on success. */ |
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49 | virtual bool build(BuildOptions& buildOptions, osg::Geometry* geometry); |
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50 | |
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51 | struct LineSegmentIntersection |
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52 | { |
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53 | LineSegmentIntersection(): |
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54 | ratio(-1.0), |
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55 | p0(0), |
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56 | p1(0), |
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57 | p2(0), |
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58 | r0(0.0f), |
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59 | r1(0.0f), |
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60 | r2(0.0f), |
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61 | primitiveIndex(0) {} |
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62 | |
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63 | bool operator < (const LineSegmentIntersection& rhs) const { return ratio < rhs.ratio; } |
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64 | |
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65 | typedef std::vector<unsigned int> IndexList; |
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66 | typedef std::vector<double> RatioList; |
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67 | |
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68 | double ratio; |
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69 | osg::Vec3d intersectionPoint; |
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70 | osg::Vec3 intersectionNormal; |
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71 | |
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72 | unsigned int p0; |
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73 | unsigned int p1; |
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74 | unsigned int p2; |
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75 | float r0; |
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76 | float r1; |
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77 | float r2; |
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78 | |
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79 | unsigned int primitiveIndex; |
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80 | }; |
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81 | |
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82 | |
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83 | typedef std::vector<LineSegmentIntersection> LineSegmentIntersections; |
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84 | |
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85 | /** compute the intersection of a line segment and the kdtree, return true if an intersection has been found.*/ |
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86 | virtual bool intersect(const osg::Vec3d& start, const osg::Vec3d& end, LineSegmentIntersections& intersections) const; |
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87 | |
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88 | |
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89 | typedef int value_type; |
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90 | |
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91 | struct KdNode |
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92 | { |
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93 | KdNode(): |
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94 | first(0), |
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95 | second(0) {} |
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96 | |
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97 | KdNode(value_type f, value_type s): |
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98 | first(f), |
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99 | second(s) {} |
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100 | |
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101 | osg::BoundingBox bb; |
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102 | |
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103 | value_type first; |
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104 | value_type second; |
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105 | }; |
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106 | |
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107 | struct Triangle |
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108 | { |
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109 | Triangle(): |
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110 | p0(0),p1(0),p2(0) {} |
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111 | |
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112 | Triangle(unsigned int ip0, unsigned int ip1, unsigned int ip2): |
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113 | p0(ip0), p1(ip1), p2(ip2) {} |
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114 | |
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115 | bool operator < (const Triangle& rhs) const |
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116 | { |
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117 | if (p0<rhs.p0) return true; |
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118 | if (p0>rhs.p0) return false; |
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119 | if (p1<rhs.p1) return true; |
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120 | if (p1>rhs.p1) return false; |
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121 | return p2<rhs.p2; |
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122 | } |
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123 | |
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124 | unsigned int p0; |
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125 | unsigned int p1; |
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126 | unsigned int p2; |
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127 | }; |
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128 | |
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129 | typedef std::vector< KdNode > KdNodeList; |
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130 | typedef std::vector< Triangle > TriangleList; |
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131 | |
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132 | int addNode(const KdNode& node) |
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133 | { |
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134 | int num = static_cast<int>(_kdNodes.size()); |
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135 | _kdNodes.push_back(node); |
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136 | return num; |
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137 | } |
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138 | |
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139 | KdNode& getNode(int nodeNum) { return _kdNodes[nodeNum]; } |
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140 | const KdNode& getNode(int nodeNum) const { return _kdNodes[nodeNum]; } |
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141 | |
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142 | KdNodeList& getNodes() { return _kdNodes; } |
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143 | const KdNodeList& getNodes() const { return _kdNodes; } |
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144 | |
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145 | void setVertices(osg::Vec3Array* vertices) { _vertices = vertices; } |
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146 | const osg::Vec3Array* getVertices() const { return _vertices.get(); } |
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147 | |
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148 | unsigned int addTriangle(const Triangle& tri) |
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149 | { |
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150 | unsigned int num = static_cast<unsigned int>(_triangles.size()); |
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151 | _triangles.push_back(tri); |
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152 | return num; |
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153 | } |
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154 | |
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155 | Triangle& getTriangle(unsigned int i) { return _triangles[i]; } |
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156 | const Triangle& getTriangle(unsigned int i) const { return _triangles[i]; } |
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157 | |
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158 | TriangleList& getTriangles() { return _triangles; } |
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159 | const TriangleList& getTriangles() const { return _triangles; } |
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160 | |
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161 | |
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162 | protected: |
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163 | |
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164 | osg::ref_ptr<osg::Vec3Array> _vertices; |
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165 | KdNodeList _kdNodes; |
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166 | TriangleList _triangles; |
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167 | |
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168 | }; |
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169 | |
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170 | class OSG_EXPORT KdTreeBuilder : public osg::NodeVisitor |
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171 | { |
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172 | public: |
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173 | |
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174 | KdTreeBuilder(); |
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175 | |
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176 | KdTreeBuilder(const KdTreeBuilder& rhs); |
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177 | |
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178 | META_NodeVisitor("osg","KdTreeBuilder") |
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179 | |
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180 | virtual KdTreeBuilder* clone() { return new KdTreeBuilder(*this); } |
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181 | |
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182 | void apply(osg::Geode& geode); |
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183 | |
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184 | KdTree::BuildOptions _buildOptions; |
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185 | |
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186 | osg::ref_ptr<osg::KdTree> _kdTreePrototype; |
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187 | |
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188 | |
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189 | |
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190 | protected: |
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191 | |
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192 | virtual ~KdTreeBuilder() {} |
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193 | |
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194 | }; |
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195 | |
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196 | } |
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197 | |
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198 | #endif |
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