1 | /************************************************************************* |
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2 | * * |
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3 | * Open Dynamics Engine, Copyright (C) 2001-2003 Russell L. Smith. * |
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4 | * All rights reserved. Email: russ@q12.org Web: www.q12.org * |
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5 | * * |
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6 | * This library is free software; you can redistribute it and/or * |
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7 | * modify it under the terms of EITHER: * |
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8 | * (1) The GNU Lesser General Public License as published by the Free * |
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9 | * Software Foundation; either version 2.1 of the License, or (at * |
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10 | * your option) any later version. The text of the GNU Lesser * |
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11 | * General Public License is included with this library in the * |
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12 | * file LICENSE.TXT. * |
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13 | * (2) The BSD-style license that is included with this library in * |
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14 | * the file LICENSE-BSD.TXT. * |
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15 | * * |
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16 | * This library is distributed in the hope that it will be useful, * |
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17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of * |
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18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the files * |
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19 | * LICENSE.TXT and LICENSE-BSD.TXT for more details. * |
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20 | * * |
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21 | *************************************************************************/ |
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22 | |
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23 | // TriMesh - Plane collider by David Walters, July 2006 |
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24 | |
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25 | #include <ode/collision.h> |
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26 | #include <ode/matrix.h> |
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27 | #include <ode/rotation.h> |
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28 | #include <ode/odemath.h> |
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29 | |
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30 | #if dTRIMESH_ENABLED |
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31 | |
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32 | #include "collision_util.h" |
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33 | #include "collision_std.h" |
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34 | |
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35 | #define TRIMESH_INTERNAL |
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36 | #include "collision_trimesh_internal.h" |
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37 | |
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38 | #if dTRIMESH_OPCODE |
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39 | int dCollideTrimeshPlane( dxGeom *o1, dxGeom *o2, int flags, dContactGeom* contacts, int skip ) |
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40 | { |
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41 | dIASSERT( skip >= (int)sizeof( dContactGeom ) ); |
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42 | dIASSERT( o1->type == dTriMeshClass ); |
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43 | dIASSERT( o2->type == dPlaneClass ); |
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44 | dIASSERT ((flags & NUMC_MASK) >= 1); |
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45 | |
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46 | // Alias pointers to the plane and trimesh |
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47 | dxTriMesh* trimesh = (dxTriMesh*)( o1 ); |
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48 | dxPlane* plane = (dxPlane*)( o2 ); |
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49 | |
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50 | int contact_count = 0; |
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51 | |
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52 | // Cache the maximum contact count. |
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53 | const int contact_max = ( flags & NUMC_MASK ); |
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54 | |
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55 | // Cache trimesh position and rotation. |
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56 | const dVector3& trimesh_pos = *(const dVector3*)dGeomGetPosition( trimesh ); |
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57 | const dMatrix3& trimesh_R = *(const dMatrix3*)dGeomGetRotation( trimesh ); |
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58 | |
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59 | // |
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60 | // For all triangles. |
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61 | // |
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62 | |
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63 | // Cache the triangle count. |
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64 | const int tri_count = trimesh->Data->Mesh.GetNbTriangles(); |
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65 | |
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66 | VertexPointers VP; |
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67 | dReal alpha; |
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68 | dVector3 vertex; |
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69 | |
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70 | #if !defined(dSINGLE) || 1 |
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71 | dVector3 int_vertex; // Intermediate vertex for double precision mode. |
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72 | #endif // dSINGLE |
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73 | |
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74 | // For each triangle |
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75 | for ( int t = 0; t < tri_count; ++t ) |
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76 | { |
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77 | // Get triangle, which should also use callback. |
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78 | trimesh->Data->Mesh.GetTriangle( VP, t ); |
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79 | |
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80 | // For each vertex. |
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81 | for ( int v = 0; v < 3; ++v ) |
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82 | { |
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83 | // |
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84 | // Get Vertex |
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85 | // |
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86 | |
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87 | #if defined(dSINGLE) && 0 // Always assign via intermediate array as otherwise it is an incapsulation violation |
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88 | |
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89 | dMULTIPLY0_331( vertex, trimesh_R, (float*)( VP.Vertex[ v ] ) ); |
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90 | |
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91 | #else // dDOUBLE || 1 |
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92 | |
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93 | // OPCODE data is in single precision format. |
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94 | int_vertex[ 0 ] = VP.Vertex[ v ]->x; |
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95 | int_vertex[ 1 ] = VP.Vertex[ v ]->y; |
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96 | int_vertex[ 2 ] = VP.Vertex[ v ]->z; |
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97 | |
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98 | dMULTIPLY0_331( vertex, trimesh_R, int_vertex ); |
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99 | |
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100 | #endif // dSINGLE/dDOUBLE |
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101 | |
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102 | vertex[ 0 ] += trimesh_pos[ 0 ]; |
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103 | vertex[ 1 ] += trimesh_pos[ 1 ]; |
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104 | vertex[ 2 ] += trimesh_pos[ 2 ]; |
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105 | |
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106 | |
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107 | // |
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108 | // Collision? |
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109 | // |
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110 | |
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111 | // If alpha < 0 then point is if front of plane. i.e. no contact |
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112 | // If alpha = 0 then the point is on the plane |
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113 | alpha = plane->p[ 3 ] - dDOT( plane->p, vertex ); |
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114 | |
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115 | // If alpha > 0 the point is behind the plane. CONTACT! |
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116 | if ( alpha > 0 ) |
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117 | { |
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118 | // Alias the contact |
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119 | dContactGeom* contact = SAFECONTACT( flags, contacts, contact_count, skip ); |
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120 | |
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121 | contact->pos[ 0 ] = vertex[ 0 ]; |
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122 | contact->pos[ 1 ] = vertex[ 1 ]; |
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123 | contact->pos[ 2 ] = vertex[ 2 ]; |
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124 | |
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125 | contact->normal[ 0 ] = plane->p[ 0 ]; |
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126 | contact->normal[ 1 ] = plane->p[ 1 ]; |
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127 | contact->normal[ 2 ] = plane->p[ 2 ]; |
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128 | |
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129 | contact->depth = alpha; |
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130 | contact->g1 = plane; |
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131 | contact->g2 = trimesh; |
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132 | |
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133 | ++contact_count; |
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134 | |
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135 | // All contact slots are full? |
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136 | if ( contact_count >= contact_max ) |
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137 | return contact_count; // <=== STOP HERE |
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138 | } |
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139 | } |
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140 | } |
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141 | |
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142 | // Return contact count. |
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143 | return contact_count; |
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144 | } |
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145 | #endif // dTRIMESH_OPCODE |
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146 | |
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147 | #if dTRIMESH_GIMPACT |
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148 | int dCollideTrimeshPlane( dxGeom *o1, dxGeom *o2, int flags, dContactGeom* contacts, int skip ) |
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149 | { |
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150 | dIASSERT( skip >= (int)sizeof( dContactGeom ) ); |
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151 | dIASSERT( o1->type == dTriMeshClass ); |
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152 | dIASSERT( o2->type == dPlaneClass ); |
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153 | dIASSERT ((flags & NUMC_MASK) >= 1); |
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154 | |
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155 | // Alias pointers to the plane and trimesh |
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156 | dxTriMesh* trimesh = (dxTriMesh*)( o1 ); |
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157 | vec4f plane; |
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158 | dGeomPlaneGetParams(o2, plane); |
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159 | |
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160 | //Find collision |
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161 | |
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162 | GDYNAMIC_ARRAY collision_result; |
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163 | GIM_CREATE_TRIMESHPLANE_CONTACTS(collision_result); |
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164 | |
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165 | gim_trimesh_plane_collision(&trimesh->m_collision_trimesh,plane,&collision_result); |
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166 | |
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167 | if(collision_result.m_size == 0 ) |
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168 | { |
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169 | GIM_DYNARRAY_DESTROY(collision_result); |
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170 | return 0; |
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171 | } |
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172 | |
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173 | |
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174 | unsigned int contactcount = collision_result.m_size; |
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175 | unsigned int contactmax = (unsigned int)(flags & NUMC_MASK); |
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176 | if (contactcount > contactmax) |
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177 | { |
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178 | contactcount = contactmax; |
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179 | } |
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180 | |
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181 | dContactGeom* pcontact; |
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182 | vec4f * planecontact_results = GIM_DYNARRAY_POINTER(vec4f,collision_result); |
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183 | |
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184 | for(unsigned int i = 0; i < contactcount; i++ ) |
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185 | { |
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186 | pcontact = SAFECONTACT(flags, contacts, i, skip); |
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187 | |
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188 | pcontact->pos[0] = (*planecontact_results)[0]; |
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189 | pcontact->pos[1] = (*planecontact_results)[1]; |
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190 | pcontact->pos[2] = (*planecontact_results)[2]; |
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191 | pcontact->pos[3] = REAL(1.0); |
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192 | |
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193 | pcontact->normal[0] = plane[0]; |
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194 | pcontact->normal[1] = plane[1]; |
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195 | pcontact->normal[2] = plane[2]; |
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196 | pcontact->normal[3] = 0; |
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197 | |
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198 | pcontact->depth = (*planecontact_results)[3]; |
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199 | pcontact->g1 = o1; |
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200 | pcontact->g2 = o2; |
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201 | |
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202 | planecontact_results++; |
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203 | } |
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204 | |
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205 | GIM_DYNARRAY_DESTROY(collision_result); |
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206 | |
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207 | return (int)contactcount; |
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208 | } |
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209 | #endif // dTRIMESH_GIMPACT |
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210 | |
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211 | |
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212 | #endif // dTRIMESH_ENABLED |
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213 | |
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