1 | |
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2 | /********************************************************************************************/ |
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3 | /* */ |
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4 | /* HSO3.hpp header file */ |
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5 | /* */ |
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6 | /* This file is not currently part of the Boost library. It is simply an example of the use */ |
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7 | /* quaternions can be put to. Hopefully it will be useful too. */ |
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8 | /* */ |
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9 | /* This file provides tools to convert between quaternions and R^3 rotation matrices. */ |
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10 | /* */ |
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11 | /********************************************************************************************/ |
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12 | |
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13 | // (C) Copyright Hubert Holin 2001. |
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14 | // Distributed under the Boost Software License, Version 1.0. (See |
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15 | // accompanying file LICENSE_1_0.txt or copy at |
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16 | // http://www.boost.org/LICENSE_1_0.txt) |
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17 | |
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18 | #ifndef TEST_HSO3_HPP |
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19 | #define TEST_HSO3_HPP |
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20 | |
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21 | #include <algorithm> |
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22 | |
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23 | #if defined(__GNUC__) && (__GNUC__ < 3) |
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24 | #include <boost/limits.hpp> |
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25 | #else |
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26 | #include <limits> |
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27 | #endif |
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28 | |
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29 | #include <stdexcept> |
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30 | #include <string> |
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31 | |
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32 | #include <boost/math/quaternion.hpp> |
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33 | |
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34 | |
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35 | #if defined(__GNUC__) && (__GNUC__ < 3) |
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36 | // gcc 2.x ignores function scope using declarations, put them here instead: |
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37 | using namespace ::std; |
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38 | using namespace ::boost::math; |
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39 | #endif |
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40 | |
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41 | template<typename TYPE_FLOAT> |
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42 | struct R3_matrix |
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43 | { |
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44 | TYPE_FLOAT a11, a12, a13; |
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45 | TYPE_FLOAT a21, a22, a23; |
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46 | TYPE_FLOAT a31, a32, a33; |
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47 | }; |
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48 | |
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49 | |
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50 | // Note: the input quaternion need not be of norm 1 for the following function |
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51 | |
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52 | template<typename TYPE_FLOAT> |
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53 | R3_matrix<TYPE_FLOAT> quaternion_to_R3_rotation(::boost::math::quaternion<TYPE_FLOAT> const & q) |
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54 | { |
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55 | using ::std::numeric_limits; |
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56 | |
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57 | TYPE_FLOAT a = q.R_component_1(); |
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58 | TYPE_FLOAT b = q.R_component_2(); |
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59 | TYPE_FLOAT c = q.R_component_3(); |
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60 | TYPE_FLOAT d = q.R_component_4(); |
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61 | |
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62 | TYPE_FLOAT aa = a*a; |
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63 | TYPE_FLOAT ab = a*b; |
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64 | TYPE_FLOAT ac = a*c; |
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65 | TYPE_FLOAT ad = a*d; |
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66 | TYPE_FLOAT bb = b*b; |
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67 | TYPE_FLOAT bc = b*c; |
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68 | TYPE_FLOAT bd = b*d; |
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69 | TYPE_FLOAT cc = c*c; |
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70 | TYPE_FLOAT cd = c*d; |
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71 | TYPE_FLOAT dd = d*d; |
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72 | |
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73 | TYPE_FLOAT norme_carre = aa+bb+cc+dd; |
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74 | |
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75 | if (norme_carre <= numeric_limits<TYPE_FLOAT>::epsilon()) |
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76 | { |
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77 | ::std::string error_reporting("Argument to quaternion_to_R3_rotation is too small!"); |
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78 | ::std::underflow_error bad_argument(error_reporting); |
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79 | |
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80 | throw(bad_argument); |
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81 | } |
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82 | |
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83 | R3_matrix<TYPE_FLOAT> out_matrix; |
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84 | |
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85 | out_matrix.a11 = (aa+bb-cc-dd)/norme_carre; |
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86 | out_matrix.a12 = 2*(-ad+bc)/norme_carre; |
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87 | out_matrix.a13 = 2*(ac+bd)/norme_carre; |
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88 | out_matrix.a21 = 2*(ad+bc)/norme_carre; |
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89 | out_matrix.a22 = (aa-bb+cc-dd)/norme_carre; |
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90 | out_matrix.a23 = 2*(-ab+cd)/norme_carre; |
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91 | out_matrix.a31 = 2*(-ac+bd)/norme_carre; |
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92 | out_matrix.a32 = 2*(ab+cd)/norme_carre; |
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93 | out_matrix.a33 = (aa-bb-cc+dd)/norme_carre; |
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94 | |
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95 | return(out_matrix); |
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96 | } |
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97 | |
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98 | |
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99 | template<typename TYPE_FLOAT> |
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100 | void find_invariant_vector( R3_matrix<TYPE_FLOAT> const & rot, |
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101 | TYPE_FLOAT & x, |
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102 | TYPE_FLOAT & y, |
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103 | TYPE_FLOAT & z) |
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104 | { |
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105 | using ::std::sqrt; |
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106 | |
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107 | using ::std::numeric_limits; |
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108 | |
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109 | TYPE_FLOAT b11 = rot.a11 - static_cast<TYPE_FLOAT>(1); |
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110 | TYPE_FLOAT b12 = rot.a12; |
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111 | TYPE_FLOAT b13 = rot.a13; |
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112 | TYPE_FLOAT b21 = rot.a21; |
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113 | TYPE_FLOAT b22 = rot.a22 - static_cast<TYPE_FLOAT>(1); |
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114 | TYPE_FLOAT b23 = rot.a23; |
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115 | TYPE_FLOAT b31 = rot.a31; |
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116 | TYPE_FLOAT b32 = rot.a32; |
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117 | TYPE_FLOAT b33 = rot.a33 - static_cast<TYPE_FLOAT>(1); |
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118 | |
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119 | TYPE_FLOAT minors[9] = |
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120 | { |
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121 | b11*b22-b12*b21, |
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122 | b11*b23-b13*b21, |
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123 | b12*b23-b13*b22, |
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124 | b11*b32-b12*b31, |
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125 | b11*b33-b13*b31, |
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126 | b12*b33-b13*b32, |
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127 | b21*b32-b22*b31, |
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128 | b21*b33-b23*b31, |
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129 | b22*b33-b23*b32 |
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130 | }; |
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131 | |
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132 | TYPE_FLOAT * where = ::std::max_element(minors, minors+9); |
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133 | |
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134 | TYPE_FLOAT det = *where; |
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135 | |
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136 | if (det <= numeric_limits<TYPE_FLOAT>::epsilon()) |
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137 | { |
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138 | ::std::string error_reporting("Underflow error in find_invariant_vector!"); |
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139 | ::std::underflow_error processing_error(error_reporting); |
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140 | |
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141 | throw(processing_error); |
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142 | } |
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143 | |
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144 | switch (where-minors) |
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145 | { |
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146 | case 0: |
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147 | |
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148 | z = static_cast<TYPE_FLOAT>(1); |
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149 | |
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150 | x = (-b13*b22+b12*b23)/det; |
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151 | y = (-b11*b23+b13*b21)/det; |
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152 | |
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153 | break; |
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154 | |
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155 | case 1: |
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156 | |
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157 | y = static_cast<TYPE_FLOAT>(1); |
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158 | |
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159 | x = (-b12*b23+b13*b22)/det; |
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160 | z = (-b11*b22+b12*b21)/det; |
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161 | |
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162 | break; |
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163 | |
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164 | case 2: |
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165 | |
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166 | x = static_cast<TYPE_FLOAT>(1); |
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167 | |
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168 | y = (-b11*b23+b13*b21)/det; |
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169 | z = (-b12*b21+b11*b22)/det; |
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170 | |
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171 | break; |
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172 | |
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173 | case 3: |
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174 | |
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175 | z = static_cast<TYPE_FLOAT>(1); |
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176 | |
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177 | x = (-b13*b32+b12*b33)/det; |
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178 | y = (-b11*b33+b13*b31)/det; |
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179 | |
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180 | break; |
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181 | |
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182 | case 4: |
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183 | |
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184 | y = static_cast<TYPE_FLOAT>(1); |
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185 | |
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186 | x = (-b12*b33+b13*b32)/det; |
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187 | z = (-b11*b32+b12*b31)/det; |
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188 | |
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189 | break; |
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190 | |
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191 | case 5: |
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192 | |
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193 | x = static_cast<TYPE_FLOAT>(1); |
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194 | |
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195 | y = (-b11*b33+b13*b31)/det; |
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196 | z = (-b12*b31+b11*b32)/det; |
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197 | |
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198 | break; |
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199 | |
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200 | case 6: |
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201 | |
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202 | z = static_cast<TYPE_FLOAT>(1); |
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203 | |
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204 | x = (-b23*b32+b22*b33)/det; |
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205 | y = (-b21*b33+b23*b31)/det; |
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206 | |
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207 | break; |
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208 | |
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209 | case 7: |
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210 | |
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211 | y = static_cast<TYPE_FLOAT>(1); |
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212 | |
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213 | x = (-b22*b33+b23*b32)/det; |
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214 | z = (-b21*b32+b22*b31)/det; |
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215 | |
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216 | break; |
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217 | |
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218 | case 8: |
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219 | |
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220 | x = static_cast<TYPE_FLOAT>(1); |
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221 | |
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222 | y = (-b21*b33+b23*b31)/det; |
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223 | z = (-b22*b31+b21*b32)/det; |
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224 | |
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225 | break; |
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226 | |
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227 | default: |
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228 | |
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229 | ::std::string error_reporting("Impossible condition in find_invariant_vector"); |
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230 | ::std::logic_error processing_error(error_reporting); |
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231 | |
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232 | throw(processing_error); |
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233 | |
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234 | break; |
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235 | } |
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236 | |
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237 | TYPE_FLOAT vecnorm = sqrt(x*x+y*y+z*z); |
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238 | |
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239 | if (vecnorm <= numeric_limits<TYPE_FLOAT>::epsilon()) |
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240 | { |
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241 | ::std::string error_reporting("Overflow error in find_invariant_vector!"); |
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242 | ::std::overflow_error processing_error(error_reporting); |
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243 | |
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244 | throw(processing_error); |
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245 | } |
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246 | |
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247 | x /= vecnorm; |
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248 | y /= vecnorm; |
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249 | z /= vecnorm; |
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250 | } |
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251 | |
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252 | |
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253 | template<typename TYPE_FLOAT> |
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254 | void find_orthogonal_vector( TYPE_FLOAT x, |
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255 | TYPE_FLOAT y, |
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256 | TYPE_FLOAT z, |
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257 | TYPE_FLOAT & u, |
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258 | TYPE_FLOAT & v, |
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259 | TYPE_FLOAT & w) |
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260 | { |
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261 | using ::std::abs; |
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262 | using ::std::sqrt; |
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263 | |
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264 | using ::std::numeric_limits; |
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265 | |
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266 | TYPE_FLOAT vecnormsqr = x*x+y*y+z*z; |
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267 | |
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268 | if (vecnormsqr <= numeric_limits<TYPE_FLOAT>::epsilon()) |
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269 | { |
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270 | ::std::string error_reporting("Underflow error in find_orthogonal_vector!"); |
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271 | ::std::underflow_error processing_error(error_reporting); |
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272 | |
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273 | throw(processing_error); |
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274 | } |
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275 | |
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276 | TYPE_FLOAT lambda; |
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277 | |
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278 | TYPE_FLOAT components[3] = |
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279 | { |
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280 | abs(x), |
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281 | abs(y), |
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282 | abs(z) |
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283 | }; |
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284 | |
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285 | TYPE_FLOAT * where = ::std::min_element(components, components+3); |
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286 | |
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287 | switch (where-components) |
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288 | { |
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289 | case 0: |
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290 | |
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291 | if (*where <= numeric_limits<TYPE_FLOAT>::epsilon()) |
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292 | { |
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293 | v = |
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294 | w = static_cast<TYPE_FLOAT>(0); |
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295 | u = static_cast<TYPE_FLOAT>(1); |
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296 | } |
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297 | else |
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298 | { |
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299 | lambda = -x/vecnormsqr; |
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300 | |
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301 | u = static_cast<TYPE_FLOAT>(1) + lambda*x; |
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302 | v = lambda*y; |
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303 | w = lambda*z; |
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304 | } |
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305 | |
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306 | break; |
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307 | |
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308 | case 1: |
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309 | |
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310 | if (*where <= numeric_limits<TYPE_FLOAT>::epsilon()) |
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311 | { |
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312 | u = |
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313 | w = static_cast<TYPE_FLOAT>(0); |
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314 | v = static_cast<TYPE_FLOAT>(1); |
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315 | } |
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316 | else |
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317 | { |
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318 | lambda = -y/vecnormsqr; |
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319 | |
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320 | u = lambda*x; |
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321 | v = static_cast<TYPE_FLOAT>(1) + lambda*y; |
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322 | w = lambda*z; |
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323 | } |
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324 | |
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325 | break; |
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326 | |
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327 | case 2: |
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328 | |
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329 | if (*where <= numeric_limits<TYPE_FLOAT>::epsilon()) |
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330 | { |
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331 | u = |
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332 | v = static_cast<TYPE_FLOAT>(0); |
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333 | w = static_cast<TYPE_FLOAT>(1); |
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334 | } |
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335 | else |
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336 | { |
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337 | lambda = -z/vecnormsqr; |
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338 | |
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339 | u = lambda*x; |
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340 | v = lambda*y; |
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341 | w = static_cast<TYPE_FLOAT>(1) + lambda*z; |
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342 | } |
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343 | |
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344 | break; |
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345 | |
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346 | default: |
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347 | |
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348 | ::std::string error_reporting("Impossible condition in find_invariant_vector"); |
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349 | ::std::logic_error processing_error(error_reporting); |
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350 | |
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351 | throw(processing_error); |
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352 | |
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353 | break; |
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354 | } |
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355 | |
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356 | TYPE_FLOAT vecnorm = sqrt(u*u+v*v+w*w); |
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357 | |
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358 | if (vecnorm <= numeric_limits<TYPE_FLOAT>::epsilon()) |
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359 | { |
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360 | ::std::string error_reporting("Underflow error in find_orthogonal_vector!"); |
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361 | ::std::underflow_error processing_error(error_reporting); |
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362 | |
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363 | throw(processing_error); |
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364 | } |
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365 | |
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366 | u /= vecnorm; |
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367 | v /= vecnorm; |
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368 | w /= vecnorm; |
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369 | } |
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370 | |
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371 | |
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372 | // Note: we want [[v, v, w], [r, s, t], [x, y, z]] to be a direct orthogonal basis |
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373 | // of R^3. It might not be orthonormal, however, and we do not check if the |
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374 | // two input vectors are colinear or not. |
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375 | |
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376 | template<typename TYPE_FLOAT> |
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377 | void find_vector_for_BOD(TYPE_FLOAT x, |
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378 | TYPE_FLOAT y, |
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379 | TYPE_FLOAT z, |
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380 | TYPE_FLOAT u, |
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381 | TYPE_FLOAT v, |
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382 | TYPE_FLOAT w, |
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383 | TYPE_FLOAT & r, |
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384 | TYPE_FLOAT & s, |
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385 | TYPE_FLOAT & t) |
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386 | { |
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387 | r = +y*w-z*v; |
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388 | s = -x*w+z*u; |
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389 | t = +x*v-y*u; |
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390 | } |
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391 | |
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392 | |
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393 | |
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394 | template<typename TYPE_FLOAT> |
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395 | inline bool is_R3_rotation_matrix(R3_matrix<TYPE_FLOAT> const & mat) |
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396 | { |
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397 | using ::std::abs; |
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398 | |
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399 | using ::std::numeric_limits; |
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400 | |
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401 | return ( |
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402 | !( |
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403 | (abs(mat.a11*mat.a11+mat.a21*mat.a21+mat.a31*mat.a31 - static_cast<TYPE_FLOAT>(1)) > static_cast<TYPE_FLOAT>(10)*numeric_limits<TYPE_FLOAT>::epsilon())|| |
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404 | (abs(mat.a11*mat.a12+mat.a21*mat.a22+mat.a31*mat.a32 - static_cast<TYPE_FLOAT>(0)) > static_cast<TYPE_FLOAT>(10)*numeric_limits<TYPE_FLOAT>::epsilon())|| |
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405 | (abs(mat.a11*mat.a13+mat.a21*mat.a23+mat.a31*mat.a33 - static_cast<TYPE_FLOAT>(0)) > static_cast<TYPE_FLOAT>(10)*numeric_limits<TYPE_FLOAT>::epsilon())|| |
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406 | //(abs(mat.a11*mat.a12+mat.a21*mat.a22+mat.a31*mat.a32 - static_cast<TYPE_FLOAT>(0)) > static_cast<TYPE_FLOAT>(10)*numeric_limits<TYPE_FLOAT>::epsilon())|| |
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407 | (abs(mat.a12*mat.a12+mat.a22*mat.a22+mat.a32*mat.a32 - static_cast<TYPE_FLOAT>(1)) > static_cast<TYPE_FLOAT>(10)*numeric_limits<TYPE_FLOAT>::epsilon())|| |
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408 | (abs(mat.a12*mat.a13+mat.a22*mat.a23+mat.a32*mat.a33 - static_cast<TYPE_FLOAT>(0)) > static_cast<TYPE_FLOAT>(10)*numeric_limits<TYPE_FLOAT>::epsilon())|| |
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409 | //(abs(mat.a11*mat.a13+mat.a21*mat.a23+mat.a31*mat.a33 - static_cast<TYPE_FLOAT>(0)) > static_cast<TYPE_FLOAT>(10)*numeric_limits<TYPE_FLOAT>::epsilon())|| |
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410 | //(abs(mat.a12*mat.a13+mat.a22*mat.a23+mat.a32*mat.a33 - static_cast<TYPE_FLOAT>(0)) > static_cast<TYPE_FLOAT>(10)*numeric_limits<TYPE_FLOAT>::epsilon())|| |
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411 | (abs(mat.a13*mat.a13+mat.a23*mat.a23+mat.a33*mat.a33 - static_cast<TYPE_FLOAT>(1)) > static_cast<TYPE_FLOAT>(10)*numeric_limits<TYPE_FLOAT>::epsilon()) |
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412 | ) |
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413 | ); |
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414 | } |
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415 | |
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416 | |
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417 | template<typename TYPE_FLOAT> |
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418 | ::boost::math::quaternion<TYPE_FLOAT> R3_rotation_to_quaternion( R3_matrix<TYPE_FLOAT> const & rot, |
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419 | ::boost::math::quaternion<TYPE_FLOAT> const * hint = 0) |
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420 | { |
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421 | using ::boost::math::abs; |
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422 | |
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423 | using ::std::abs; |
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424 | using ::std::sqrt; |
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425 | |
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426 | using ::std::numeric_limits; |
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427 | |
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428 | if (!is_R3_rotation_matrix(rot)) |
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429 | { |
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430 | ::std::string error_reporting("Argument to R3_rotation_to_quaternion is not an R^3 rotation matrix!"); |
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431 | ::std::range_error bad_argument(error_reporting); |
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432 | |
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433 | throw(bad_argument); |
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434 | } |
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435 | |
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436 | ::boost::math::quaternion<TYPE_FLOAT> q; |
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437 | |
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438 | if ( |
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439 | (abs(rot.a11 - static_cast<TYPE_FLOAT>(1)) <= numeric_limits<TYPE_FLOAT>::epsilon())&& |
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440 | (abs(rot.a22 - static_cast<TYPE_FLOAT>(1)) <= numeric_limits<TYPE_FLOAT>::epsilon())&& |
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441 | (abs(rot.a33 - static_cast<TYPE_FLOAT>(1)) <= numeric_limits<TYPE_FLOAT>::epsilon()) |
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442 | ) |
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443 | { |
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444 | q = ::boost::math::quaternion<TYPE_FLOAT>(1); |
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445 | } |
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446 | else |
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447 | { |
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448 | TYPE_FLOAT cos_theta = (rot.a11+rot.a22+rot.a33-static_cast<TYPE_FLOAT>(1))/static_cast<TYPE_FLOAT>(2); |
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449 | TYPE_FLOAT stuff = (cos_theta+static_cast<TYPE_FLOAT>(1))/static_cast<TYPE_FLOAT>(2); |
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450 | TYPE_FLOAT cos_theta_sur_2 = sqrt(stuff); |
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451 | TYPE_FLOAT sin_theta_sur_2 = sqrt(1-stuff); |
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452 | |
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453 | TYPE_FLOAT x; |
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454 | TYPE_FLOAT y; |
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455 | TYPE_FLOAT z; |
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456 | |
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457 | find_invariant_vector(rot, x, y, z); |
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458 | |
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459 | TYPE_FLOAT u; |
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460 | TYPE_FLOAT v; |
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461 | TYPE_FLOAT w; |
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462 | |
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463 | find_orthogonal_vector(x, y, z, u, v, w); |
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464 | |
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465 | TYPE_FLOAT r; |
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466 | TYPE_FLOAT s; |
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467 | TYPE_FLOAT t; |
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468 | |
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469 | find_vector_for_BOD(x, y, z, u, v, w, r, s, t); |
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470 | |
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471 | TYPE_FLOAT ru = rot.a11*u+rot.a12*v+rot.a13*w; |
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472 | TYPE_FLOAT rv = rot.a21*u+rot.a22*v+rot.a23*w; |
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473 | TYPE_FLOAT rw = rot.a31*u+rot.a32*v+rot.a33*w; |
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474 | |
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475 | TYPE_FLOAT angle_sign_determinator = r*ru+s*rv+t*rw; |
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476 | |
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477 | if (angle_sign_determinator > +numeric_limits<TYPE_FLOAT>::epsilon()) |
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478 | { |
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479 | q = ::boost::math::quaternion<TYPE_FLOAT>(cos_theta_sur_2, +x*sin_theta_sur_2, +y*sin_theta_sur_2, +z*sin_theta_sur_2); |
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480 | } |
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481 | else if (angle_sign_determinator < -numeric_limits<TYPE_FLOAT>::epsilon()) |
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482 | { |
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483 | q = ::boost::math::quaternion<TYPE_FLOAT>(cos_theta_sur_2, -x*sin_theta_sur_2, -y*sin_theta_sur_2, -z*sin_theta_sur_2); |
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484 | } |
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485 | else |
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486 | { |
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487 | TYPE_FLOAT desambiguator = u*ru+v*rv+w*rw; |
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488 | |
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489 | if (desambiguator >= static_cast<TYPE_FLOAT>(1)) |
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490 | { |
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491 | q = ::boost::math::quaternion<TYPE_FLOAT>(0, +x, +y, +z); |
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492 | } |
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493 | else |
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494 | { |
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495 | q = ::boost::math::quaternion<TYPE_FLOAT>(0, -x, -y, -z); |
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496 | } |
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497 | } |
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498 | } |
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499 | |
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500 | if ((hint != 0) && (abs(*hint+q) < abs(*hint-q))) |
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501 | { |
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502 | return(-q); |
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503 | } |
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504 | |
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505 | return(q); |
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506 | } |
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507 | |
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508 | #endif /* TEST_HSO3_HPP */ |
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509 | |
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