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I have the following model

<MeshGeometry3D x:Key="SphereOR10GR13"
          Positions="121.4130 33.9882 64.3701  85.0383 102.2932 168.1890  0.0000 0.0000 0.0000  68.8637 96.3488 159.4094  82.9020 105.2468 168.1890  36.2556 196.8622 64.3701  85.0383 138.7499 159.4094  148.6907 0.0000 23.3858  148.6907 260.7480 23.3858  89.4149 143.2779 146.1417  133.5125 17.5473 43.2677  55.2861 66.8433 108.0315  103.1995 66.8433 108.0315  45.2233 183.7492 108.0315  95.7690 82.0510 146.1417  73.5422 138.7499 168.1890  73.5422 102.2932 159.4094  95.7690 82.0510 127.6378  113.5304 183.7492 108.0315  141.4439 9.9759 23.3858  133.5125 17.5473 64.3701  45.2233 50.9146 85.5906  141.4439 238.9917 43.2677  82.9020 105.2468 188.7008  62.2651 82.0510 146.1417  113.5304 50.9146 85.5906  22.8432 220.2245 43.2677  55.2861 167.1189 108.0315  148.6907 260.7480 23.3858  121.4130 196.8622 85.5906  103.1995 167.1189 108.0315  121.4130 33.9882 64.3701  148.6907 0.0000 23.3858  89.4149 96.3488 159.4094  82.9020 135.2862 168.1890  82.9020 105.2468 188.7008  103.1995 66.8433 108.0315  0.0000 260.7480 23.3858  10.2234 238.9917 23.3858  89.4149 96.3488 146.1417  85.0383 138.7499 168.1890  121.4130 196.8622 64.3701  95.7690 153.5077 146.1417  133.5125 17.5473 43.2677  22.8432 220.2245 43.2677  55.2861 66.8433 127.6378  45.2233 50.9146 108.0315  95.7690 153.5077 127.6378  0.0000 260.7480 0.0000  73.5422 102.2932 168.1890  113.5304 183.7492 85.5906  62.2651 82.0510 146.1417  113.5304 50.9146 108.0315  85.0383 138.7499 168.1890  68.8637 143.2779 159.4094  55.2861 167.1189 108.0315  133.5125 220.2245 43.2677  133.5125 220.2245 64.3701  22.8432 220.2245 64.3701  89.4149 143.2779 159.4094  148.6907 0.0000 23.3858  62.2651 82.0510 127.6378  10.2234 9.9759 43.2677  77.1146 105.2468 168.1890  82.9020 135.2862 168.1890  73.5422 138.7499 159.4094  10.2234 9.9759 23.3858  62.2651 153.5077 146.1417  36.2556 33.9882 85.5906  133.5125 220.2245 64.3701  85.0383 102.2932 168.1890  22.8432 220.2245 43.2677  113.5304 183.7492 108.0315  36.2556 33.9882 85.5906  22.8432 17.5473 43.2677  141.4439 238.9917 43.2677  36.2556 196.8622 64.3701  82.9020 135.2862 168.1890  45.2233 183.7492 108.0315  148.6907 260.7480 0.0000  0.0000 0.0000 23.3858  73.5422 102.2932 159.4094  82.9020 105.2468 188.7008  55.2861 66.8433 127.6378  103.1995 66.8433 127.6378  22.8432 220.2245 64.3701  36.2556 33.9882 64.3701  77.1146 105.2468 188.7008  62.2651 153.5077 127.6378  0.0000 260.7480 0.0000  22.8432 17.5473 64.3701  10.2234 238.9917 43.2677  55.2861 66.8433 108.0315  103.1995 66.8433 108.0315  73.5422 102.2932 159.4094  77.1146 105.2468 188.7008  85.0383 138.7499 159.4094  45.2233 50.9146 85.5906  133.5125 17.5473 43.2677  0.0000 0.0000 23.3858  89.4149 143.2779 146.1417  103.1995 66.8433 127.6378  22.8432 17.5473 43.2677  85.0383 102.2932 168.1890  55.2861 167.1189 127.6378  22.8432 220.2245 64.3701  68.8637 96.3488 146.1417  103.1995 167.1189 127.6378  148.6907 260.7480 23.3858  95.7690 153.5077 146.1417  133.5125 220.2245 43.2677  62.2651 82.0510 127.6378  77.1146 135.2862 188.7008  10.2234 238.9917 43.2677  141.4439 238.9917 23.3858  82.9020 105.2468 168.1890  89.4149 96.3488 159.4094  45.2233 183.7492 85.5906  73.5422 102.2932 168.1890  85.0383 102.2932 159.4094  121.4130 33.9882 85.5906  55.2861 167.1189 127.6378  77.1146 135.2862 188.7008  95.7690 153.5077 146.1417  121.4130 33.9882 85.5906  141.4439 238.9917 23.3858  133.5125 17.5473 64.3701  10.2234 9.9759 43.2677  45.2233 50.9146 108.0315  133.5125 220.2245 64.3701  89.4149 96.3488 146.1417  113.5304 50.9146 108.0315  121.4130 196.8622 64.3701  95.7690 153.5077 127.6378  133.5125 17.5473 64.3701  82.9020 105.2468 168.1890  73.5422 138.7499 159.4094  62.2651 153.5077 146.1417  89.4149 143.2779 146.1417  68.8637 143.2779 146.1417  121.4130 33.9882 64.3701  103.1995 167.1189 108.0315  141.4439 9.9759 43.2677  141.4439 9.9759 23.3858  95.7690 82.0510 146.1417  36.2556 33.9882 85.5906  77.1146 135.2862 168.1890  10.2234 238.9917 43.2677  77.1146 105.2468 188.7008  10.2234 9.9759 43.2677  62.2651 153.5077 127.6378  85.0383 102.2932 159.4094  113.5304 50.9146 85.5906  113.5304 183.7492 108.0315  55.2861 66.8433 127.6378  103.1995 66.8433 127.6378  36.2556 33.9882 64.3701  10.2234 9.9759 23.3858  36.2556 196.8622 85.5906  0.0000 260.7480 23.3858  82.9020 135.2862 188.7008  22.8432 17.5473 43.2677  62.2651 153.5077 146.1417  68.8637 96.3488 159.4094  148.6907 260.7480 0.0000  73.5422 138.7499 168.1890  85.0383 138.7499 168.1890  68.8637 96.3488 146.1417  121.4130 196.8622 85.5906  68.8637 143.2779 146.1417  141.4439 238.9917 23.3858  89.4149 143.2779 159.4094  22.8432 17.5473 64.3701  73.5422 138.7499 168.1890  45.2233 183.7492 85.5906  77.1146 105.2468 168.1890  68.8637 96.3488 146.1417  148.6907 260.7480 0.0000  141.4439 9.9759 43.2677  0.0000 260.7480 23.3858  113.5304 183.7492 85.5906  148.6907 0.0000 0.0000  55.2861 167.1189 108.0315  22.8432 17.5473 64.3701  121.4130 196.8622 64.3701  103.1995 167.1189 108.0315  10.2234 238.9917 23.3858  68.8637 143.2779 159.4094  36.2556 196.8622 85.5906  45.2233 50.9146 108.0315  77.1146 105.2468 168.1890  0.0000 260.7480 0.0000  141.4439 238.9917 43.2677  95.7690 153.5077 127.6378  95.7690 82.0510 146.1417  95.7690 82.0510 127.6378  103.1995 167.1189 127.6378  77.1146 135.2862 168.1890  36.2556 196.8622 64.3701  45.2233 183.7492 108.0315  89.4149 96.3488 159.4094  82.9020 135.2862 188.7008  121.4130 196.8622 85.5906  89.4149 143.2779 159.4094  77.1146 135.2862 168.1890  148.6907 0.0000 0.0000  45.2233 50.9146 85.5906  62.2651 153.5077 127.6378  85.0383 138.7499 159.4094  10.2234 9.9759 23.3858  141.4439 9.9759 43.2677  77.1146 135.2862 188.7008  85.0383 102.2932 159.4094  73.5422 138.7499 159.4094  95.7690 82.0510 127.6378  113.5304 50.9146 85.5906  133.5125 220.2245 43.2677  73.5422 102.2932 168.1890  141.4439 9.9759 23.3858  82.9020 135.2862 188.7008  121.4130 33.9882 85.5906  62.2651 82.0510 146.1417  62.2651 82.0510 127.6378  148.6907 0.0000 0.0000  55.2861 66.8433 108.0315  89.4149 96.3488 146.1417  55.2861 167.1189 127.6378  68.8637 143.2779 146.1417  10.2234 238.9917 23.3858  45.2233 183.7492 85.5906  68.8637 96.3488 159.4094  36.2556 33.9882 64.3701  113.5304 183.7492 85.5906  103.1995 167.1189 127.6378  36.2556 196.8622 85.5906  113.5304 50.9146 108.0315  68.8637 143.2779 159.4094  "
          TextureCoordinates="33.9882 64.3701  85.0383 102.2932  0.0000 0.0000  -96.3488 159.4094  82.9020 105.2468  -36.2556 64.3701  85.0383 138.7499  148.6907 0.0000  260.7480 23.3858  89.4149 143.2779  17.5473 43.2677  55.2861 66.8433  103.1995 66.8433  -45.2233 108.0315  95.7690 82.0510  -138.7499 168.1890  73.5422 159.4094  95.7690 127.6378  -113.5304 108.0315  9.9759 23.3858  17.5473 64.3701  45.2233 85.5906  238.9917 43.2677  82.9020 188.7008  -82.0510 146.1417  50.9146 85.5906  22.8432 220.2245  55.2861 167.1189  -148.6907 23.3858  -121.4130 85.5906  103.1995 167.1189  121.4130 33.9882  148.6907 23.3858  89.4149 96.3488  135.2862 168.1890  105.2468 188.7008  66.8433 108.0315  0.0000 23.3858  10.2234 238.9917  89.4149 146.1417  85.0383 138.7499  -121.4130 64.3701  -95.7690 146.1417  133.5125 17.5473  -220.2245 43.2677  -66.8433 127.6378  -50.9146 108.0315  95.7690 153.5077  -260.7480 0.0000  -102.2932 168.1890  183.7492 85.5906  62.2651 82.0510  113.5304 50.9146  -85.0383 168.1890  -68.8637 159.4094  -55.2861 108.0315  220.2245 43.2677  133.5125 220.2245  -220.2245 64.3701  89.4149 143.2779  0.0000 23.3858  62.2651 127.6378  10.2234 43.2677  77.1146 105.2468  -82.9020 168.1890  -138.7499 159.4094  10.2234 9.9759  -153.5077 146.1417  36.2556 33.9882  220.2245 64.3701  102.2932 168.1890  -22.8432 43.2677  113.5304 183.7492  36.2556 85.5906  -17.5473 43.2677  -141.4439 43.2677  36.2556 196.8622  82.9020 135.2862  -183.7492 108.0315  -148.6907 260.7480  0.0000 0.0000  73.5422 102.2932  82.9020 105.2468  55.2861 66.8433  103.1995 66.8433  -22.8432 64.3701  36.2556 64.3701  77.1146 188.7008  62.2651 153.5077  0.0000 260.7480  -17.5473 64.3701  -238.9917 43.2677  55.2861 108.0315  103.1995 108.0315  -102.2932 159.4094  -105.2468 188.7008  -85.0383 159.4094  45.2233 50.9146  133.5125 43.2677  0.0000 23.3858  143.2779 146.1417  66.8433 127.6378  22.8432 17.5473  85.0383 168.1890  55.2861 167.1189  22.8432 220.2245  68.8637 96.3488  103.1995 167.1189  148.6907 260.7480  153.5077 146.1417  -133.5125 43.2677  -82.0510 127.6378  -77.1146 188.7008  10.2234 238.9917  141.4439 238.9917  82.9020 168.1890  89.4149 159.4094  45.2233 183.7492  73.5422 102.2932  102.2932 159.4094  121.4130 33.9882  -55.2861 127.6378  -135.2862 188.7008  95.7690 153.5077  121.4130 85.5906  238.9917 23.3858  133.5125 64.3701  -9.9759 43.2677  45.2233 108.0315  -133.5125 64.3701  96.3488 146.1417  50.9146 108.0315  121.4130 196.8622  -95.7690 127.6378  133.5125 17.5473  105.2468 168.1890  73.5422 138.7499  -62.2651 146.1417  -89.4149 146.1417  68.8637 143.2779  121.4130 64.3701  -103.1995 108.0315  141.4439 43.2677  141.4439 9.9759  82.0510 146.1417  -33.9882 85.5906  77.1146 135.2862  -10.2234 43.2677  77.1146 105.2468  10.2234 9.9759  -153.5077 127.6378  85.0383 159.4094  113.5304 85.5906  183.7492 108.0315  55.2861 127.6378  103.1995 127.6378  -33.9882 64.3701  10.2234 23.3858  36.2556 196.8622  -260.7480 23.3858  82.9020 135.2862  22.8432 43.2677  62.2651 153.5077  68.8637 96.3488  260.7480 0.0000  73.5422 138.7499  138.7499 168.1890  68.8637 146.1417  196.8622 85.5906  -143.2779 146.1417  -141.4439 23.3858  143.2779 159.4094  22.8432 64.3701  -73.5422 168.1890  -45.2233 85.5906  77.1146 168.1890  -96.3488 146.1417  -148.6907 0.0000  9.9759 43.2677  0.0000 260.7480  -113.5304 85.5906  148.6907 0.0000  -167.1189 108.0315  22.8432 17.5473  196.8622 64.3701  167.1189 108.0315  -238.9917 23.3858  68.8637 143.2779  -196.8622 85.5906  45.2233 50.9146  -105.2468 168.1890  0.0000 0.0000  141.4439 238.9917  153.5077 127.6378  95.7690 146.1417  95.7690 82.0510  -103.1995 127.6378  -77.1146 168.1890  -196.8622 64.3701  45.2233 183.7492  96.3488 159.4094  135.2862 188.7008  121.4130 196.8622  -89.4149 159.4094  -135.2862 168.1890  0.0000 0.0000  -50.9146 85.5906  -62.2651 127.6378  138.7499 159.4094  -9.9759 23.3858  141.4439 9.9759  77.1146 135.2862  85.0383 102.2932  -73.5422 159.4094  82.0510 127.6378  113.5304 50.9146  133.5125 220.2245  73.5422 168.1890  141.4439 23.3858  -82.9020 188.7008  33.9882 85.5906  62.2651 146.1417  62.2651 82.0510  -148.6907 0.0000  -66.8433 108.0315  89.4149 96.3488  -167.1189 127.6378  -68.8637 146.1417  -10.2234 23.3858  -183.7492 85.5906  68.8637 159.4094  36.2556 33.9882  113.5304 183.7492  167.1189 127.6378  -36.2556 85.5906  113.5304 108.0315  -143.2779 159.4094  "
          TriangleIndices="79 2 89 2 79 223 80 66 179 66 80 7 66 7 143 143 7 114 179 38 108 38 179 66 108 38 114 108 114 7 32 2 181 2 32 99 159 2 99 2 159 48 37 177 191 177 37 28 164 60 205 60 164 8 149 102 113 102 149 210 102 210 43 43 210 216 113 26 192 26 113 102 192 26 216 192 216 210 91 209 127 209 91 186 142 157 218 157 142 62 125 178 19 178 125 22 147 170 228 170 147 75 183 231 105 231 183 134 231 134 31 31 134 132 105 76 57 76 105 231 57 76 132 57 132 134 58 74 90 74 58 44 126 161 98 161 126 172 56 20 10 20 56 69 85 110 71 110 85 129 68 97 158 97 68 120 97 120 215 215 120 232 158 117 202 117 158 97 202 117 232 202 232 120 184 220 0 220 184 168 234 41 5 41 234 29 188 156 145 156 188 198 124 86 140 86 124 73 189 11 199 11 189 52 11 52 12 12 52 30 199 27 72 27 199 11 72 27 30 72 30 52 235 21 152 21 235 128 50 131 25 131 50 153 13 180 174 180 13 18 78 206 46 206 78 229 83 222 104 222 83 84 222 84 195 195 84 47 104 88 107 88 104 222 107 88 47 107 47 84 155 92 93 92 155 154 185 101 36 101 185 233 121 141 55 141 121 196 226 224 45 224 226 182 51 106 162 106 51 14 106 14 225 225 14 9 162 139 123 139 162 106 123 139 9 123 9 14 194 61 17 61 194 221 193 144 214 144 193 109 137 133 207 133 137 42 67 111 24 111 67 150 163 81 187 81 163 33 81 33 212 212 33 6 187 136 59 136 187 81 59 136 6 59 6 33 236 176 3 176 236 169 116 167 39 167 116 230 100 200 130 200 100 171 54 138 227 138 54 203 118 63 165 63 118 1 63 1 4 4 1 77 165 146 40 146 165 63 40 146 77 40 77 1 173 96 213 96 173 53 15 94 49 94 15 65 103 16 151 16 103 217 208 70 119 70 208 166 82 211 148 211 82 160 23 175 115 175 23 87 34 35 135 35 34 201 112 64 197 64 112 219 122 190 95 190 122 204 "
                    />

My grid size is MaxHeight="1000" MaxWidth="1000"

How can I make the camera in the viewport3d show all the model something like fit view?

Thank you