1 | /*
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2 | glh - is a platform-indepenedent C++ OpenGL helper library
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3 |
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4 |
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5 | Copyright (c) 2000 Cass Everitt
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6 | Copyright (c) 2001 NVIDIA Corporation
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7 | All rights reserved.
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8 |
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9 | Redistribution and use in source and binary forms, with or
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10 | without modification, are permitted provided that the following
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11 | conditions are met:
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12 |
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13 | * Redistributions of source code must retain the above
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14 | copyright notice, this list of conditions and the following
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15 | disclaimer.
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16 |
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17 | * Redistributions in binary form must reproduce the above
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18 | copyright notice, this list of conditions and the following
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19 | disclaimer in the documentation and/or other materials
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20 | provided with the distribution.
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21 |
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22 | * The names of contributors to this software may not be used
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23 | to endorse or promote products derived from this software
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24 | without specific prior written permission.
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25 |
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26 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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27 | ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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28 | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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29 | FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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30 | REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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31 | INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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32 | BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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33 | LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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34 | CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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35 | LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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36 | ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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37 | POSSIBILITY OF SUCH DAMAGE.
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38 |
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39 |
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40 | Cass Everitt - cass@r3.nu
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41 | */
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42 |
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43 | #ifndef GLH_INTERACTORS_H
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44 | #define GLH_INTERACTORS_H
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45 |
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46 | #include <math.h>
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47 |
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48 | namespace glh
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49 | {
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50 |
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51 | class translator
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52 | {
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53 | public:
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54 | translator()
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55 | {
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56 | scale = .01f;
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57 | invert_increment = false;
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58 | parent_rotation = 0;
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59 | }
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60 |
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61 | void pan (int dx, int dy) { update(dx, dy, 0); }
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62 | void dolly(int dz) { update( 0, 0, dz); }
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63 |
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64 | void update(int dx, int dy, int dz)
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65 | {
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66 | vec3f v(dx, dy, dz);
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67 |
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68 | // apply parent rotation
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69 | if(parent_rotation != 0)
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70 | parent_rotation->mult_vec(v);
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71 |
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72 | if(invert_increment)
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73 | t -= v * scale;
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74 | else
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75 | t += v * scale;
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76 | }
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77 |
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78 |
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79 | matrix4f get_transform()
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80 | {
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81 | matrix4f m;
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82 | m.set_translate(t);
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83 | return m;
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84 | }
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85 |
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86 | matrix4f get_inverse_transform()
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87 | {
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88 | matrix4f m;
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89 | m.set_translate(-t);
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90 | return m;
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91 | }
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92 |
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93 | bool invert_increment;
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94 | const rotationf * parent_rotation;
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95 | vec3f t;
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96 | float scale;
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97 | };
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98 |
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99 |
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100 |
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101 | class trackball
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102 | {
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103 | public:
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104 | trackball()
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105 | {
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106 | r = rotationf(vec3f(0, 1, 0), 0);
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107 | centroid = vec3f(0,0,0);
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108 | scale = -.01f;
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109 | invert_increment = false;
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110 | parent_rotation = 0;
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111 | legacy_mode = false;
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112 | }
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113 |
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114 | void rotate(int x0, int y0, int x1, int y1)
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115 | { update(x0, y0, x1, y1); }
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116 |
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117 | void update(int x0, int y0, int x1, int y1)
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118 | {
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119 | int dx = x1 - x0;
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120 | int dy = y1 - y0;
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121 | if(dx == 0 && dy == 0)
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122 | {
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123 | incr = rotationf();
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124 | return;
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125 | }
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126 |
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127 | if(legacy_mode)
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128 | {
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129 | vec3f v(dy, -dx, 0);
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130 | float len = v.normalize();
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131 | if(parent_rotation != 0)
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132 | parent_rotation->mult_vec(v);
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133 | //r.mult_dir(vec3f(v), v);
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134 | if(invert_increment)
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135 | incr.set_value(v, -len * scale);
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136 | else
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137 | incr.set_value(v, len * scale);
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138 | }
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139 | else
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140 | {
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141 | vec3f a(x0, y0, 0);
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142 | vec3f b(x1, y1, 0);
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143 | a -= offset;
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144 | b -= offset;
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145 | a /= radius;
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146 | b /= radius;
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147 |
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148 | float tmpscale = 1;
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149 | a[2] = pow(2.0f, -0.5f * a.length());
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150 | a.normalize();
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151 | b[2] = pow(2.0f, -0.5f * b.length());
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152 | b.normalize();
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153 |
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154 |
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155 |
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156 | vec3f axis = a.cross(b);
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157 | axis.normalize();
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158 |
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159 | float angle = acos(a.dot(b));
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160 |
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161 | if(parent_rotation != 0) parent_rotation->mult_vec(axis);
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162 |
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163 | if(invert_increment)
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164 | incr.set_value(axis, -angle * tmpscale);
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165 | else
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166 | incr.set_value(axis, angle * tmpscale);
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167 |
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168 | }
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169 |
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170 | // fixme: shouldn't operator*() preserve 'r' in this case?
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171 | if(incr[3] != 0)
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172 | r = incr * r;
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173 | }
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174 |
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175 | void increment_rotation()
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176 | {
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177 | // fixme: shouldn't operator*() preserve 'r' in this case?
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178 | if(incr[3] != 0)
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179 | r = incr * r;
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180 | }
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181 |
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182 | matrix4f get_transform()
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183 | {
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184 | matrix4f mt, mr, minvt;
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185 | mt.set_translate(centroid);
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186 | r.get_value(mr);
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187 | minvt.set_translate(-centroid);
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188 | return mt * mr * minvt;
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189 | }
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190 |
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191 | matrix4f get_inverse_transform()
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192 | {
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193 | matrix4f mt, mr, minvt;
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194 | mt.set_translate(centroid);
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195 | r.inverse().get_value(mr);
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196 | minvt.set_translate(-centroid);
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197 | return mt * mr * minvt;
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198 | }
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199 |
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200 | bool invert_increment;
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201 | const rotationf * parent_rotation;
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202 | rotationf r;
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203 | vec3f centroid;
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204 | float scale;
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205 | bool legacy_mode;
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206 | rotationf incr;
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207 | float radius;
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208 | vec3f offset;
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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 | #endif
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