1 | //Copyright and Disclaimer: |
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2 | //This code is copyright Vienna University of Technology, 2004. |
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3 | |
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4 | #include <memory.h> |
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5 | #include <stdlib.h> |
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6 | #include <malloc.h> |
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7 | #include "DataTypes.h" |
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8 | #include "MathStuff.h" |
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9 | |
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10 | const struct Object OBJECT_NULL = { 0, 0 }; |
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11 | const struct VecPoint VECPOINT_NULL = { 0, 0 }; |
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12 | const struct VecPlane VECPLANE_NULL = { 0, 0 }; |
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13 | |
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14 | void copyVector3(Vector3 result, const Vector3 input) { |
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15 | result[0] = input[0]; |
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16 | result[1] = input[1]; |
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17 | result[2] = input[2]; |
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18 | } |
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19 | |
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20 | void addVector3(Vector3 result, const Vector3 a, const Vector3 b) { |
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21 | int i; |
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22 | for(i = 0; i < 3; i++) { |
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23 | result[i] = a[i]+b[i]; |
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24 | } |
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25 | } |
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26 | |
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27 | void diffVector3(Vector3 result, const Vector3 a, const Vector3 b) { |
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28 | int i; |
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29 | for(i = 0; i < 3; i++) { |
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30 | result[i] = a[i]-b[i]; |
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31 | } |
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32 | } |
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33 | |
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34 | void copyVector3Values(Vector3 result, const double x, const double y, const double z) { |
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35 | result[0] = x; |
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36 | result[1] = y; |
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37 | result[2] = z; |
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38 | } |
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39 | |
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40 | void copyMatrix(Matrix4x4 result, const Matrix4x4 input) { |
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41 | if(input != result) { |
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42 | memcpy(result,input,4*4*sizeof(double)); |
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43 | } |
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44 | } |
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45 | |
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46 | void planesSetSize(struct VecPlane* p, const int size) { |
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47 | if(0 != p) { |
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48 | if(size == p->size) { |
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49 | return; |
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50 | } |
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51 | p->plane = (struct Plane*)realloc(p->plane,size*sizeof(struct Plane)); |
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52 | p->size = size; |
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53 | } |
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54 | } |
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55 | |
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56 | void emptyVecPlane(struct VecPlane* p) { |
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57 | planesSetSize(p,0); |
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58 | } |
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59 | |
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60 | void vecPointSetSize(struct VecPoint* poly, const int size) { |
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61 | if(0 != poly) { |
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62 | if(size == poly->size) { |
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63 | return; |
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64 | } |
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65 | poly->points = (Vector3*)realloc(poly->points,size*sizeof(Vector3)); |
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66 | poly->size = size; |
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67 | } |
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68 | } |
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69 | |
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70 | void emptyVecPoint(struct VecPoint* poly) { |
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71 | vecPointSetSize(poly,0); |
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72 | } |
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73 | |
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74 | void append2VecPoint(struct VecPoint* poly, const Vector3 p) { |
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75 | if(0 != poly) { |
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76 | int size = poly->size; |
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77 | vecPointSetSize(poly,size+1); |
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78 | copyVector3(poly->points[size],p); |
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79 | } |
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80 | } |
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81 | |
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82 | void copyVecPoint(struct VecPoint* poly, const struct VecPoint poly2) { |
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83 | if(0 != poly) { |
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84 | int i; |
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85 | vecPointSetSize(poly,poly2.size); |
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86 | for(i= 0; i < poly2.size; i++) { |
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87 | copyVector3(poly->points[i],poly2.points[i]); |
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88 | } |
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89 | } |
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90 | } |
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91 | |
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92 | void swapVecPoint(struct VecPoint* poly1, struct VecPoint* poly2) { |
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93 | if(0 != poly1 && 0 != poly2 && poly1 != poly2) { |
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94 | { |
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95 | Vector3* points = poly1->points; |
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96 | poly1->points = poly2->points; |
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97 | poly2->points = points; |
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98 | } |
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99 | { |
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100 | int size = poly1->size; |
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101 | poly1->size = poly2->size; |
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102 | poly2->size = size; |
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103 | } |
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104 | } |
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105 | } |
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106 | |
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107 | void objectSetSize(struct Object* obj, const int size) { |
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108 | if(0 != obj) { |
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109 | int i; |
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110 | if(size == obj->size) { |
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111 | return; |
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112 | } |
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113 | //dispose if shrinking |
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114 | for(i = size; i < obj->size; i++) { |
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115 | emptyVecPoint( &(obj->poly[i]) ); |
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116 | } |
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117 | //allocate new place |
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118 | obj->poly = (struct VecPoint*)realloc(obj->poly,size*sizeof(struct VecPoint)); |
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119 | //initialize new place |
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120 | for(i = obj->size; i < size; i++) { |
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121 | obj->poly[i] = VECPOINT_NULL; |
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122 | } |
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123 | obj->size = size; |
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124 | } |
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125 | } |
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126 | |
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127 | void emptyObject(struct Object* obj) { |
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128 | objectSetSize(obj,0); |
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129 | } |
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130 | |
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131 | void copyObject(struct Object* obj, const struct Object objIn) { |
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132 | if(0 != obj) { |
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133 | int i; |
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134 | objectSetSize(obj,objIn.size); |
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135 | for(i = 0; i < objIn.size; i++) { |
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136 | copyVecPoint( &(obj->poly[i]), objIn.poly[i]); |
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137 | } |
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138 | } |
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139 | } |
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140 | |
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141 | void append2Object(struct Object* obj, const struct VecPoint poly) { |
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142 | if(0 != obj) { |
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143 | int size = obj->size; |
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144 | objectSetSize(obj,size+1); |
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145 | copyVecPoint( &(obj->poly[size]) ,poly); |
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146 | } |
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147 | } |
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148 | |
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149 | |
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150 | void convObject2VecPoint(struct VecPoint* points,const struct Object obj) { |
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151 | if(0 != points) { |
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152 | int i, j; |
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153 | emptyVecPoint(points); |
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154 | for(i = 0; i < obj.size; i++) { |
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155 | struct VecPoint* p = &(obj.poly[i]); |
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156 | for(j = 0; j < p->size; j++) { |
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157 | append2VecPoint(points,p->points[j]); |
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158 | } |
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159 | } |
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160 | } |
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161 | } |
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162 | |
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163 | void calcAABoxPoints(Vector3x8 points, const struct AABox b) { |
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164 | //generate 8 corners of the box |
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165 | copyVector3Values(points[0],b.min[0],b.min[1],b.min[2]);// 7+------+6 |
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166 | copyVector3Values(points[1],b.max[0],b.min[1],b.min[2]);// /| /| |
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167 | copyVector3Values(points[2],b.max[0],b.max[1],b.min[2]);// / | / | |
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168 | copyVector3Values(points[3],b.min[0],b.max[1],b.min[2]);// / 4+---/--+5 |
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169 | copyVector3Values(points[4],b.min[0],b.min[1],b.max[2]);// 3+------+2 / y z |
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170 | copyVector3Values(points[5],b.max[0],b.min[1],b.max[2]);// | / | / | / |
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171 | copyVector3Values(points[6],b.max[0],b.max[1],b.max[2]);// |/ |/ |/ |
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172 | copyVector3Values(points[7],b.min[0],b.max[1],b.max[2]);// 0+------+1 *---x |
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173 | } |
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174 | |
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175 | void calcAABoxPlanes(struct VecPlane* planes, const struct AABox b) { |
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176 | if(0 != planes) { |
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177 | struct Plane *p; |
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178 | planesSetSize(planes,6); |
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179 | |
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180 | //bottom plane |
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181 | p = &(planes->plane[0]); |
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182 | copyVector3Values(p->n,0,-1,0); |
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183 | p->d = absDouble(b.min[1]); |
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184 | |
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185 | //top plane |
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186 | p = &(planes->plane[1]); |
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187 | copyVector3Values(p->n,0,1,0); |
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188 | p->d = absDouble(b.max[1]); |
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189 | |
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190 | //left plane |
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191 | p = &(planes->plane[2]); |
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192 | copyVector3Values(p->n,-1,0,0); |
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193 | p->d = absDouble(b.min[0]); |
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194 | |
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195 | //right plane |
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196 | p = &(planes->plane[3]); |
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197 | copyVector3Values(p->n,1,0,0); |
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198 | p->d = absDouble(b.max[0]); |
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199 | |
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200 | //back plane |
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201 | p = &(planes->plane[4]); |
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202 | copyVector3Values(p->n,0,0,-1); |
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203 | p->d = absDouble(b.min[2]); |
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204 | |
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205 | //front plane |
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206 | p = &(planes->plane[5]); |
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207 | copyVector3Values(p->n,0,0,1); |
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208 | p->d = absDouble(b.max[2]); |
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209 | |
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210 | } |
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211 | } |
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212 | |
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213 | double getPlaneCoeff(struct Plane* plane, int i) |
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214 | { |
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215 | if(i < 3) return plane->n[i]; |
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216 | return plane->d; |
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217 | } |
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218 | |
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219 | void setPlaneCoeff(double coeff, struct Plane* plane, int i) |
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220 | { |
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221 | if(i < 3) |
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222 | plane->n[i] = coeff; |
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223 | else |
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224 | plane->d = coeff; |
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225 | } |
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