src/Main/CameraGroup.cxx

   1 // Copyright (C) 2008  Tim Moore
   2 // Copyright (C) 2011  Mathias Froehlich
   3 //
   4 // This program is free software; you can redistribute it and/or
   5 // modify it under the terms of the GNU General Public License as
   6 // published by the Free Software Foundation; either version 2 of the
   7 // License, or (at your option) any later version.
   8 //
   9 // This program is distributed in the hope that it will be useful, but
  10 // WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12 // General Public License for more details.
  13 //
  14 // You should have received a copy of the GNU General Public License
  15 // along with this program; if not, write to the Free Software
  16 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  17
  18 #ifdef HAVE_CONFIG_H
  19 #  include <config.h>
  20 #endif
  21
  22 #include "CameraGroup.hxx"
  23
  24 #include "fg_props.hxx"
  25 #include "globals.hxx"
  26 #include "renderer.hxx"
  27 #include "FGEventHandler.hxx"
  28 #include "WindowBuilder.hxx"
  29 #include "WindowSystemAdapter.hxx"
  30 #include <simgear/props/props.hxx>
  31 #include <simgear/structure/OSGUtils.hxx>
  32 #include <simgear/structure/OSGVersion.hxx>
  33 #include <simgear/scene/material/EffectCullVisitor.hxx>
  34 #include <simgear/scene/util/RenderConstants.hxx>
  35
  36 #include <algorithm>
  37 #include <cstring>
  38 #include <string>
  39
  40 #include <osg/Camera>
  41 #include <osg/Geometry>
  42 #include <osg/GraphicsContext>
  43 #include <osg/io_utils>
  44 #include <osg/Math>
  45 #include <osg/Matrix>
  46 #include <osg/Notify>
  47 #include <osg/Program>
  48 #include <osg/Quat>
  49 #include <osg/TexMat>
  50 #include <osg/Vec3d>
  51 #include <osg/Viewport>
  52
  53 #include <osgUtil/IntersectionVisitor>
  54
  55 #include <osgViewer/GraphicsWindow>
  56 #include <osgViewer/Renderer>
  57
  58 static osg::Matrix
  59 invert(const osg::Matrix& matrix)
  60 {
  61     return osg::Matrix::inverse(matrix);
  62 }
  63
  64 /// Returns the zoom factor of the master camera.
  65 /// The reference fov is the historic 55 deg
  66 static double
  67 zoomFactor()
  68 {
  69     double fov = fgGetDouble("/sim/current-view/field-of-view", 55);
  70     if (fov < 1)
  71         fov = 1;
  72     return tan(55*0.5*SG_DEGREES_TO_RADIANS)/tan(fov*0.5*SG_DEGREES_TO_RADIANS);
  73 }
  74
  75 static osg::Vec2d
  76 preMult(const osg::Vec2d& v, const osg::Matrix& m)
  77 {
  78   osg::Vec3d tmp = m.preMult(osg::Vec3(v, 0));
  79   return osg::Vec2d(tmp[0], tmp[1]);
  80 }
  81
  82 static osg::Matrix
  83 relativeProjection(const osg::Matrix& P0, const osg::Matrix& R, const osg::Vec2d ref[2],
  84                    const osg::Matrix& pP, const osg::Matrix& pR, const osg::Vec2d pRef[2])
  85 {
  86   // Track the way from one projection space to the other:
  87   // We want
  88   //  P = T*S*P0
  89   // where P0 is the projection template sensible for the given window size,
  90   // T is a translation matrix and S a scale matrix.
  91   // We need to determine T and S so that the reference points in the parents
  92   // projection space match the two reference points in this cameras projection space.
  93
  94   // Starting from the parents camera projection space, we get into this cameras
  95   // projection space by the transform matrix:
  96   //  P*R*inv(pP*pR) = T*S*P0*R*inv(pP*pR)
  97   // So, at first compute that matrix without T*S and determine S and T from that
  98
  99   // Ok, now osg uses the inverse matrix multiplication order, thus:
 100   osg::Matrix PtoPwithoutTS = invert(pR*pP)*R*P0;
 101   // Compute the parents reference points in the current projection space
 102   // without the yet unknown T and S
 103   osg::Vec2d pRefInThis[2] = {
 104     preMult(pRef[0], PtoPwithoutTS),
 105     preMult(pRef[1], PtoPwithoutTS)
 106   };
 107
 108   // To get the same zoom, rescale to match the parents size
 109   double s = (ref[0] - ref[1]).length()/(pRefInThis[0] - pRefInThis[1]).length();
 110   osg::Matrix S = osg::Matrix::scale(s, s, 1);
 111
 112   // For the translation offset, incorporate the now known scale
 113   // and recompute the position ot the first reference point in the
 114   // currents projection space without the yet unknown T.
 115   pRefInThis[0] = preMult(pRef[0], PtoPwithoutTS*S);
 116   // The translation is then the difference of the reference points
 117   osg::Matrix T = osg::Matrix::translate(osg::Vec3d(ref[0] - pRefInThis[0], 0));
 118
 119   // Compose and return the desired final projection matrix
 120   return P0*S*T;
 121 }
 122
 123 namespace flightgear
 124 {
 125 using namespace osg;
 126
 127 using std::strcmp;
 128 using std::string;
 129
 130 ref_ptr<CameraGroup> CameraGroup::_defaultGroup;
 131
 132 CameraGroup::CameraGroup(osgViewer::Viewer* viewer) :
 133     _viewer(viewer)
 134 {
 135 }
 136
 137 }
 138
 139 namespace
 140 {
 141 using namespace osg;
 142
 143 // Given a projection matrix, return a new one with the same frustum
 144 // sides and new near / far values.
 145
 146 void makeNewProjMat(Matrixd& oldProj, double znear,
 147                                        double zfar, Matrixd& projection)
 148 {
 149     projection = oldProj;
 150     // Slightly inflate the near & far planes to avoid objects at the
 151     // extremes being clipped out.
 152     znear *= 0.999;
 153     zfar *= 1.001;
 154
 155     // Clamp the projection matrix z values to the range (near, far)
 156     double epsilon = 1.0e-6;
 157     if (fabs(projection(0,3)) < epsilon &&
 158         fabs(projection(1,3)) < epsilon &&
 159         fabs(projection(2,3)) < epsilon) {
 160         // Projection is Orthographic
 161         epsilon = -1.0/(zfar - znear); // Used as a temp variable
 162         projection(2,2) = 2.0*epsilon;
 163         projection(3,2) = (zfar + znear)*epsilon;
 164     } else {
 165         // Projection is Perspective
 166         double trans_near = (-znear*projection(2,2) + projection(3,2)) /
 167             (-znear*projection(2,3) + projection(3,3));
 168         double trans_far = (-zfar*projection(2,2) + projection(3,2)) /
 169             (-zfar*projection(2,3) + projection(3,3));
 170         double ratio = fabs(2.0/(trans_near - trans_far));
 171         double center = -0.5*(trans_near + trans_far);
 172
 173         projection.postMult(osg::Matrixd(1.0, 0.0, 0.0, 0.0,
 174                                          0.0, 1.0, 0.0, 0.0,
 175                                          0.0, 0.0, ratio, 0.0,
 176                                          0.0, 0.0, center*ratio, 1.0));
 177     }
 178 }
 179 }
 180
 181 namespace flightgear
 182 {
 183 void CameraInfo::updateCameras()
 184 {
 185         for (CameraMap::iterator ii = cameras.begin(); ii != cameras.end(); ++ii ) {
 186                 float f = ii->second.scaleFactor;
 187                 ii->second.camera->getViewport()->setViewport(x*f, y*f, width*f, height*f);
 188         }
 189 }
 190
 191 osg::Camera* CameraInfo::getCamera(CameraKind k) const
 192 {
 193         CameraMap::const_iterator ii = cameras.find( k );
 194         if (ii == cameras.end())
 195                 return 0;
 196         return ii->second.camera.get();
 197 }
 198
 199 osg::Camera* CameraInfo::getMainCamera() const
 200 {
 201         return cameras.find( MAIN_CAMERA )->second.camera.get();
 202 }
 203
 204 int CameraInfo::getMainSlaveIndex() const
 205 {
 206         return cameras.find( MAIN_CAMERA )->second.slaveIndex;
 207 }
 208
 209 void CameraGroup::update(const osg::Vec3d& position,
 210                          const osg::Quat& orientation)
 211 {
 212     const Matrix masterView(osg::Matrix::translate(-position)
 213                             * osg::Matrix::rotate(orientation.inverse()));
 214     _viewer->getCamera()->setViewMatrix(masterView);
 215     const Matrix& masterProj = _viewer->getCamera()->getProjectionMatrix();
 216     double masterZoomFactor = zoomFactor();
 217     for (CameraList::iterator i = _cameras.begin(); i != _cameras.end(); ++i) {
 218         const CameraInfo* info = i->get();
 219                 const View::Slave& slave = _viewer->getSlave(info->getMainSlaveIndex());
 220 #if SG_OSG_VERSION_LESS_THAN(3,0,0)
 221         // refreshes camera viewports (for now)
 222         info->updateCameras();
 223 #endif
 224                 Camera* camera = info->getMainCamera();
 225         Matrix viewMatrix;
 226
 227         if (info->flags & GUI) {
 228           viewMatrix = osg::Matrix(); // identifty transform on the GUI camera
 229         } else if ((info->flags & VIEW_ABSOLUTE) != 0)
 230             viewMatrix = slave._viewOffset;
 231         else
 232             viewMatrix = masterView * slave._viewOffset;
 233         camera->setViewMatrix(viewMatrix);
 234         Matrix projectionMatrix;
 235
 236         if (info->flags & GUI) {
 237           projectionMatrix = osg::Matrix::ortho2D(0, info->width, 0, info->height);
 238         } else if ((info->flags & PROJECTION_ABSOLUTE) != 0) {
 239             if (info->flags & ENABLE_MASTER_ZOOM) {
 240                 if (info->relativeCameraParent < _cameras.size()) {
 241                     // template projection matrix and view matrix of the current camera
 242                     osg::Matrix P0 = slave._projectionOffset;
 243                     osg::Matrix R = viewMatrix;
 244
 245                     // The already known projection and view matrix of the parent camera
 246                     const CameraInfo* parentInfo = _cameras[info->relativeCameraParent].get();
 247                                         RenderStageInfo prsi = parentInfo->cameras.find(CameraInfo::MAIN_CAMERA)->second;
 248                     osg::Matrix pP = prsi.camera->getProjectionMatrix();
 249                     osg::Matrix pR = prsi.camera->getViewMatrix();
 250
 251                     // And the projection matrix derived from P0 so that the reference points match
 252                     projectionMatrix = relativeProjection(P0, R, info->thisReference,
 253                                                           pP, pR, info->parentReference);
 254
 255                 } else {
 256                     // We want to zoom, so take the original matrix and apply the zoom to it.
 257                     projectionMatrix = slave._projectionOffset;
 258                     projectionMatrix.postMultScale(osg::Vec3d(masterZoomFactor, masterZoomFactor, 1));
 259                 }
 260             } else {
 261                 projectionMatrix = slave._projectionOffset;
 262             }
 263         } else {
 264             projectionMatrix = masterProj * slave._projectionOffset;
 265         }
 266
 267                 CameraInfo::CameraMap::const_iterator ii = info->cameras.find(CameraInfo::FAR_CAMERA);
 268                 if (ii == info->cameras.end() || !ii->second.camera.valid()) {
 269             camera->setProjectionMatrix(projectionMatrix);
 270         } else {
 271             Camera* farCamera = ii->second.camera;
 272             farCamera->setViewMatrix(viewMatrix);
 273             double left, right, bottom, top, parentNear, parentFar;
 274             projectionMatrix.getFrustum(left, right, bottom, top,
 275                                         parentNear, parentFar);
 276             if ((info->flags & FIXED_NEAR_FAR) == 0) {
 277                 parentNear = _zNear;
 278                 parentFar = _zFar;
 279             }
 280             if (parentFar < _nearField || _nearField == 0.0f) {
 281                 camera->setProjectionMatrix(projectionMatrix);
 282                 camera->setCullMask(camera->getCullMask()
 283                                     | simgear::BACKGROUND_BIT);
 284                 camera->setClearMask(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
 285                 farCamera->setNodeMask(0);
 286             } else {
 287                 Matrix nearProj, farProj;
 288                 makeNewProjMat(projectionMatrix, parentNear, _nearField,
 289                                nearProj);
 290                 makeNewProjMat(projectionMatrix, _nearField, parentFar,
 291                                farProj);
 292                 camera->setProjectionMatrix(nearProj);
 293                 camera->setCullMask(camera->getCullMask()
 294                                     & ~simgear::BACKGROUND_BIT);
 295                 camera->setClearMask(GL_DEPTH_BUFFER_BIT);
 296                 farCamera->setProjectionMatrix(farProj);
 297                 farCamera->setNodeMask(camera->getNodeMask());
 298             }
 299         }
 300     }
 301 }
 302
 303 void CameraGroup::setCameraParameters(float vfov, float aspectRatio)
 304 {
 305     if (vfov != 0.0f && aspectRatio != 0.0f)
 306         _viewer->getCamera()
 307             ->setProjectionMatrixAsPerspective(vfov,
 308                                                1.0f / aspectRatio,
 309                                                _zNear, _zFar);
 310 }
 311
 312 double CameraGroup::getMasterAspectRatio() const
 313 {
 314     if (_cameras.empty())
 315         return 0.0;
 316
 317     const CameraInfo* info = _cameras.front();
 318
 319         osg::Camera* camera = info->cameras.find(CameraInfo::MAIN_CAMERA)->second.camera.get();
 320     const osg::Viewport* viewport = camera->getViewport();
 321     if (!viewport) {
 322         return 0.0;
 323     }
 324
 325     return static_cast<double>(viewport->height()) / viewport->width();
 326 }
 327
 328 }
 329
 330 namespace
 331 {
 332 // A raw value for property nodes that references a class member via
 333 // an osg::ref_ptr.
 334 template<class C, class T>
 335 class RefMember : public SGRawValue<T>
 336 {
 337 public:
 338     RefMember (C *obj, T C::*ptr)
 339         : _obj(obj), _ptr(ptr) {}
 340     virtual ~RefMember () {}
 341     virtual T getValue () const
 342     {
 343         return _obj.get()->*_ptr;
 344     }
 345     virtual bool setValue (T value)
 346     {
 347         _obj.get()->*_ptr = value;
 348         return true;
 349     }
 350     virtual SGRawValue<T> * clone () const
 351     {
 352         return new RefMember(_obj.get(), _ptr);
 353     }
 354 private:
 355     ref_ptr<C> _obj;
 356     T C::* const _ptr;
 357 };
 358
 359 template<typename C, typename T>
 360 RefMember<C, T> makeRefMember(C *obj, T C::*ptr)
 361 {
 362     return RefMember<C, T>(obj, ptr);
 363 }
 364
 365 template<typename C, typename T>
 366 void bindMemberToNode(SGPropertyNode* parent, const char* childName,
 367                       C* obj, T C::*ptr, T value)
 368 {
 369     SGPropertyNode* valNode = parent->getNode(childName);
 370     RefMember<C, T> refMember = makeRefMember(obj, ptr);
 371     if (!valNode) {
 372         valNode = parent->getNode(childName, true);
 373         valNode->tie(refMember, false);
 374         setValue(valNode, value);
 375     } else {
 376         valNode->tie(refMember, true);
 377     }
 378 }
 379
 380 void buildViewport(flightgear::CameraInfo* info, SGPropertyNode* viewportNode,
 381                    const osg::GraphicsContext::Traits *traits)
 382 {
 383     using namespace flightgear;
 384     bindMemberToNode(viewportNode, "x", info, &CameraInfo::x, 0.0);
 385     bindMemberToNode(viewportNode, "y", info, &CameraInfo::y, 0.0);
 386     bindMemberToNode(viewportNode, "width", info, &CameraInfo::width,
 387                      static_cast<double>(traits->width));
 388     bindMemberToNode(viewportNode, "height", info, &CameraInfo::height,
 389                      static_cast<double>(traits->height));
 390 }
 391 }
 392
 393 namespace flightgear
 394 {
 395
 396 // Mostly copied from osg's osgViewer/View.cpp
 397
 398 static osg::Geometry* createParoramicSphericalDisplayDistortionMesh(
 399     const Vec3& origin, const Vec3& widthVector, const Vec3& heightVector,
 400     double sphere_radius, double collar_radius,
 401     Image* intensityMap = 0, const Matrix& projectorMatrix = Matrix())
 402 {
 403     osg::Vec3d center(0.0,0.0,0.0);
 404     osg::Vec3d eye(0.0,0.0,0.0);
 405
 406     double distance = sqrt(sphere_radius*sphere_radius - collar_radius*collar_radius);
 407     bool flip = false;
 408     bool texcoord_flip = false;
 409
 410 #if 0
 411     osg::Vec3d projector = eye - osg::Vec3d(0.0,0.0, distance);
 412
 413     OSG_INFO<<"createParoramicSphericalDisplayDistortionMesh : Projector position = "<<projector<<std::endl;
 414     OSG_INFO<<"createParoramicSphericalDisplayDistortionMesh : distance = "<<distance<<std::endl;
 415 #endif
 416     // create the quad to visualize.
 417     osg::Geometry* geometry = new osg::Geometry();
 418
 419     geometry->setSupportsDisplayList(false);
 420
 421     osg::Vec3 xAxis(widthVector);
 422     float width = widthVector.length();
 423     xAxis /= width;
 424
 425     osg::Vec3 yAxis(heightVector);
 426     float height = heightVector.length();
 427     yAxis /= height;
 428
 429     int noSteps = 160;
 430
 431     osg::Vec3Array* vertices = new osg::Vec3Array;
 432     osg::Vec2Array* texcoords0 = new osg::Vec2Array;
 433     osg::Vec2Array* texcoords1 = intensityMap==0 ? new osg::Vec2Array : 0;
 434     osg::Vec4Array* colors = new osg::Vec4Array;
 435
 436 #if 0
 437     osg::Vec3 bottom = origin;
 438     osg::Vec3 dx = xAxis*(width/((float)(noSteps-2)));
 439     osg::Vec3 dy = yAxis*(height/((float)(noSteps-1)));
 440 #endif
 441     osg::Vec3 top = origin + yAxis*height;
 442
 443     osg::Vec3 screenCenter = origin + widthVector*0.5f + heightVector*0.5f;
 444     float screenRadius = heightVector.length() * 0.5f;
 445
 446     geometry->getOrCreateStateSet()->setMode(GL_CULL_FACE, osg::StateAttribute::OFF | osg::StateAttribute::PROTECTED);
 447
 448     for(int i=0;i<noSteps;++i)
 449     {
 450         //osg::Vec3 cursor = bottom+dy*(float)i;
 451         for(int j=0;j<noSteps;++j)
 452         {
 453             osg::Vec2 texcoord(double(i)/double(noSteps-1), double(j)/double(noSteps-1));
 454             double theta = texcoord.x() * 2.0 * osg::PI;
 455             double phi = (1.0-texcoord.y()) * osg::PI;
 456
 457             if (texcoord_flip) texcoord.y() = 1.0f - texcoord.y();
 458
 459             osg::Vec3 pos(sin(phi)*sin(theta), sin(phi)*cos(theta), cos(phi));
 460             pos = pos*projectorMatrix;
 461
 462             double alpha = atan2(pos.x(), pos.y());
 463             if (alpha<0.0) alpha += 2.0*osg::PI;
 464
 465             double beta = atan2(sqrt(pos.x()*pos.x() + pos.y()*pos.y()), pos.z());
 466             if (beta<0.0) beta += 2.0*osg::PI;
 467
 468             double gamma = atan2(sqrt(double(pos.x()*pos.x() + pos.y()*pos.y())), double(pos.z()+distance));
 469             if (gamma<0.0) gamma += 2.0*osg::PI;
 470
 471
 472             osg::Vec3 v = screenCenter + osg::Vec3(sin(alpha)*gamma*2.0/osg::PI, -cos(alpha)*gamma*2.0/osg::PI, 0.0f)*screenRadius;
 473
 474             if (flip)
 475                 vertices->push_back(osg::Vec3(v.x(), top.y()-(v.y()-origin.y()),v.z()));
 476             else
 477                 vertices->push_back(v);
 478
 479             texcoords0->push_back( texcoord );
 480
 481             osg::Vec2 texcoord1(alpha/(2.0*osg::PI), 1.0f - beta/osg::PI);
 482             if (intensityMap)
 483             {
 484                 colors->push_back(intensityMap->getColor(texcoord1));
 485             }
 486             else
 487             {
 488                 colors->push_back(osg::Vec4(1.0f,1.0f,1.0f,1.0f));
 489                 if (texcoords1) texcoords1->push_back( texcoord1 );
 490             }
 491
 492
 493         }
 494     }
 495
 496
 497     // pass the created vertex array to the points geometry object.
 498     geometry->setVertexArray(vertices);
 499
 500     geometry->setColorArray(colors);
 501     geometry->setColorBinding(osg::Geometry::BIND_PER_VERTEX);
 502
 503     geometry->setTexCoordArray(0,texcoords0);
 504     if (texcoords1) geometry->setTexCoordArray(1,texcoords1);
 505
 506     osg::DrawElementsUShort* elements = new osg::DrawElementsUShort(osg::PrimitiveSet::TRIANGLES);
 507     geometry->addPrimitiveSet(elements);
 508
 509     for(int i=0;i<noSteps-1;++i)
 510     {
 511         for(int j=0;j<noSteps-1;++j)
 512         {
 513             int i1 = j+(i+1)*noSteps;
 514             int i2 = j+(i)*noSteps;
 515             int i3 = j+1+(i)*noSteps;
 516             int i4 = j+1+(i+1)*noSteps;
 517
 518             osg::Vec3& v1 = (*vertices)[i1];
 519             osg::Vec3& v2 = (*vertices)[i2];
 520             osg::Vec3& v3 = (*vertices)[i3];
 521             osg::Vec3& v4 = (*vertices)[i4];
 522
 523             if ((v1-screenCenter).length()>screenRadius) continue;
 524             if ((v2-screenCenter).length()>screenRadius) continue;
 525             if ((v3-screenCenter).length()>screenRadius) continue;
 526             if ((v4-screenCenter).length()>screenRadius) continue;
 527
 528             elements->push_back(i1);
 529             elements->push_back(i2);
 530             elements->push_back(i3);
 531
 532             elements->push_back(i1);
 533             elements->push_back(i3);
 534             elements->push_back(i4);
 535         }
 536     }
 537
 538     return geometry;
 539 }
 540
 541 void CameraGroup::buildDistortionCamera(const SGPropertyNode* psNode,
 542                                         Camera* camera)
 543 {
 544     const SGPropertyNode* texNode = psNode->getNode("texture");
 545     if (!texNode) {
 546         // error
 547         return;
 548     }
 549     string texName = texNode->getStringValue();
 550     TextureMap::iterator itr = _textureTargets.find(texName);
 551     if (itr == _textureTargets.end()) {
 552         // error
 553         return;
 554     }
 555     Viewport* viewport = camera->getViewport();
 556     float width = viewport->width();
 557     float height = viewport->height();
 558     TextureRectangle* texRect = itr->second.get();
 559     double radius = psNode->getDoubleValue("radius", 1.0);
 560     double collar = psNode->getDoubleValue("collar", 0.45);
 561     Geode* geode = new Geode();
 562     geode->addDrawable(createParoramicSphericalDisplayDistortionMesh(
 563                            Vec3(0.0f,0.0f,0.0f), Vec3(width,0.0f,0.0f),
 564                            Vec3(0.0f,height,0.0f), radius, collar));
 565
 566     // new we need to add the texture to the mesh, we do so by creating a
 567     // StateSet to contain the Texture StateAttribute.
 568     StateSet* stateset = geode->getOrCreateStateSet();
 569     stateset->setTextureAttributeAndModes(0, texRect, StateAttribute::ON);
 570     stateset->setMode(GL_LIGHTING, StateAttribute::OFF);
 571
 572     TexMat* texmat = new TexMat;
 573     texmat->setScaleByTextureRectangleSize(true);
 574     stateset->setTextureAttributeAndModes(0, texmat, osg::StateAttribute::ON);
 575 #if 0
 576     if (!applyIntensityMapAsColours && intensityMap)
 577     {
 578         stateset->setTextureAttributeAndModes(1, new osg::Texture2D(intensityMap), osg::StateAttribute::ON);
 579     }
 580 #endif
 581     // add subgraph to render
 582     camera->addChild(geode);
 583     camera->setClearMask(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
 584     camera->setClearColor(osg::Vec4(0.0, 0.0, 0.0, 1.0));
 585     camera->setComputeNearFarMode(osg::CullSettings::DO_NOT_COMPUTE_NEAR_FAR);
 586     camera->setCullingMode(osg::CullSettings::NO_CULLING);
 587     camera->setName("DistortionCorrectionCamera");
 588 }
 589
 590 CameraInfo* CameraGroup::buildCamera(SGPropertyNode* cameraNode)
 591 {
 592     WindowBuilder *wBuild = WindowBuilder::getWindowBuilder();
 593     const SGPropertyNode* windowNode = cameraNode->getNode("window");
 594     GraphicsWindow* window = 0;
 595     int cameraFlags = DO_INTERSECTION_TEST;
 596     if (windowNode) {
 597         // New style window declaration / definition
 598         window = wBuild->buildWindow(windowNode);
 599     } else {
 600         // Old style: suck window params out of camera block
 601         window = wBuild->buildWindow(cameraNode);
 602     }
 603     if (!window) {
 604         return 0;
 605     }
 606     Camera* camera = new Camera;
 607     camera->setAllowEventFocus(false);
 608     camera->setGraphicsContext(window->gc.get());
 609     camera->setViewport(new Viewport);
 610     camera->setCullingMode(CullSettings::SMALL_FEATURE_CULLING
 611                            | CullSettings::VIEW_FRUSTUM_CULLING);
 612     camera->setInheritanceMask(CullSettings::ALL_VARIABLES
 613                                & ~(CullSettings::CULL_MASK
 614                                    | CullSettings::CULLING_MODE
 615 #if defined(HAVE_CULLSETTINGS_CLEAR_MASK)
 616                                    | CullSettings::CLEAR_MASK
 617 #endif
 618                                    ));
 619
 620     osg::Matrix vOff;
 621     const SGPropertyNode* viewNode = cameraNode->getNode("view");
 622     if (viewNode) {
 623         double heading = viewNode->getDoubleValue("heading-deg", 0.0);
 624         double pitch = viewNode->getDoubleValue("pitch-deg", 0.0);
 625         double roll = viewNode->getDoubleValue("roll-deg", 0.0);
 626         double x = viewNode->getDoubleValue("x", 0.0);
 627         double y = viewNode->getDoubleValue("y", 0.0);
 628         double z = viewNode->getDoubleValue("z", 0.0);
 629         // Build a view matrix, which is the inverse of a model
 630         // orientation matrix.
 631         vOff = (Matrix::translate(-x, -y, -z)
 632                 * Matrix::rotate(-DegreesToRadians(heading),
 633                                  Vec3d(0.0, 1.0, 0.0),
 634                                  -DegreesToRadians(pitch),
 635                                  Vec3d(1.0, 0.0, 0.0),
 636                                  -DegreesToRadians(roll),
 637                                  Vec3d(0.0, 0.0, 1.0)));
 638         if (viewNode->getBoolValue("absolute", false))
 639             cameraFlags |= VIEW_ABSOLUTE;
 640     } else {
 641         // Old heading parameter, works in the opposite direction
 642         double heading = cameraNode->getDoubleValue("heading-deg", 0.0);
 643         vOff.makeRotate(DegreesToRadians(heading), osg::Vec3(0, 1, 0));
 644     }
 645     // Configuring the physical dimensions of a monitor
 646     SGPropertyNode* viewportNode = cameraNode->getNode("viewport", true);
 647     double physicalWidth = viewportNode->getDoubleValue("width", 1024);
 648     double physicalHeight = viewportNode->getDoubleValue("height", 768);
 649     double bezelHeightTop = 0;
 650     double bezelHeightBottom = 0;
 651     double bezelWidthLeft = 0;
 652     double bezelWidthRight = 0;
 653     const SGPropertyNode* physicalDimensionsNode = 0;
 654     if ((physicalDimensionsNode = cameraNode->getNode("physical-dimensions")) != 0) {
 655         physicalWidth = physicalDimensionsNode->getDoubleValue("width", physicalWidth);
 656         physicalHeight = physicalDimensionsNode->getDoubleValue("height", physicalHeight);
 657         const SGPropertyNode* bezelNode = 0;
 658         if ((bezelNode = physicalDimensionsNode->getNode("bezel")) != 0) {
 659             bezelHeightTop = bezelNode->getDoubleValue("top", bezelHeightTop);
 660             bezelHeightBottom = bezelNode->getDoubleValue("bottom", bezelHeightBottom);
 661             bezelWidthLeft = bezelNode->getDoubleValue("left", bezelWidthLeft);
 662             bezelWidthRight = bezelNode->getDoubleValue("right", bezelWidthRight);
 663         }
 664     }
 665     osg::Matrix pOff;
 666     unsigned parentCameraIndex = ~0u;
 667     osg::Vec2d parentReference[2];
 668     osg::Vec2d thisReference[2];
 669     SGPropertyNode* projectionNode = 0;
 670     if ((projectionNode = cameraNode->getNode("perspective")) != 0) {
 671         double fovy = projectionNode->getDoubleValue("fovy-deg", 55.0);
 672         double aspectRatio = projectionNode->getDoubleValue("aspect-ratio",
 673                                                             1.0);
 674         double zNear = projectionNode->getDoubleValue("near", 0.0);
 675         double zFar = projectionNode->getDoubleValue("far", zNear + 20000);
 676         double offsetX = projectionNode->getDoubleValue("offset-x", 0.0);
 677         double offsetY = projectionNode->getDoubleValue("offset-y", 0.0);
 678         double tan_fovy = tan(DegreesToRadians(fovy*0.5));
 679         double right = tan_fovy * aspectRatio * zNear + offsetX;
 680         double left = -tan_fovy * aspectRatio * zNear + offsetX;
 681         double top = tan_fovy * zNear + offsetY;
 682         double bottom = -tan_fovy * zNear + offsetY;
 683         pOff.makeFrustum(left, right, bottom, top, zNear, zFar);
 684         cameraFlags |= PROJECTION_ABSOLUTE;
 685         if (projectionNode->getBoolValue("fixed-near-far", true))
 686             cameraFlags |= FIXED_NEAR_FAR;
 687     } else if ((projectionNode = cameraNode->getNode("frustum")) != 0
 688                || (projectionNode = cameraNode->getNode("ortho")) != 0) {
 689         double top = projectionNode->getDoubleValue("top", 0.0);
 690         double bottom = projectionNode->getDoubleValue("bottom", 0.0);
 691         double left = projectionNode->getDoubleValue("left", 0.0);
 692         double right = projectionNode->getDoubleValue("right", 0.0);
 693         double zNear = projectionNode->getDoubleValue("near", 0.0);
 694         double zFar = projectionNode->getDoubleValue("far", zNear + 20000);
 695         if (cameraNode->getNode("frustum")) {
 696             pOff.makeFrustum(left, right, bottom, top, zNear, zFar);
 697             cameraFlags |= PROJECTION_ABSOLUTE;
 698         } else {
 699             pOff.makeOrtho(left, right, bottom, top, zNear, zFar);
 700             cameraFlags |= (PROJECTION_ABSOLUTE | ORTHO);
 701         }
 702         if (projectionNode->getBoolValue("fixed-near-far", true))
 703             cameraFlags |= FIXED_NEAR_FAR;
 704     } else if ((projectionNode = cameraNode->getNode("master-perspective")) != 0) {
 705         double zNear = projectionNode->getDoubleValue("eye-distance", 0.4*physicalWidth);
 706         double xoff = projectionNode->getDoubleValue("x-offset", 0);
 707         double yoff = projectionNode->getDoubleValue("y-offset", 0);
 708         double left = -0.5*physicalWidth - xoff;
 709         double right = 0.5*physicalWidth - xoff;
 710         double bottom = -0.5*physicalHeight - yoff;
 711         double top = 0.5*physicalHeight - yoff;
 712         pOff.makeFrustum(left, right, bottom, top, zNear, zNear*1000);
 713         cameraFlags |= PROJECTION_ABSOLUTE | ENABLE_MASTER_ZOOM;
 714     } else if ((projectionNode = cameraNode->getNode("right-of-perspective"))
 715                || (projectionNode = cameraNode->getNode("left-of-perspective"))
 716                || (projectionNode = cameraNode->getNode("above-perspective"))
 717                || (projectionNode = cameraNode->getNode("below-perspective"))
 718                || (projectionNode = cameraNode->getNode("reference-points-perspective"))) {
 719         std::string name = projectionNode->getStringValue("parent-camera");
 720         for (unsigned i = 0; i < _cameras.size(); ++i) {
 721             if (_cameras[i]->name != name)
 722                 continue;
 723             parentCameraIndex = i;
 724         }
 725         if (_cameras.size() <= parentCameraIndex) {
 726             SG_LOG(SG_VIEW, SG_ALERT, "CameraGroup::buildCamera: "
 727                    "failed to find parent camera for relative camera!");
 728             return 0;
 729         }
 730         const CameraInfo* parentInfo = _cameras[parentCameraIndex].get();
 731         if (projectionNode->getNameString() == "right-of-perspective") {
 732             double tmp = (parentInfo->physicalWidth + 2*parentInfo->bezelWidthRight)/parentInfo->physicalWidth;
 733             parentReference[0] = osg::Vec2d(tmp, -1);
 734             parentReference[1] = osg::Vec2d(tmp, 1);
 735             tmp = (physicalWidth + 2*bezelWidthLeft)/physicalWidth;
 736             thisReference[0] = osg::Vec2d(-tmp, -1);
 737             thisReference[1] = osg::Vec2d(-tmp, 1);
 738         } else if (projectionNode->getNameString() == "left-of-perspective") {
 739             double tmp = (parentInfo->physicalWidth + 2*parentInfo->bezelWidthLeft)/parentInfo->physicalWidth;
 740             parentReference[0] = osg::Vec2d(-tmp, -1);
 741             parentReference[1] = osg::Vec2d(-tmp, 1);
 742             tmp = (physicalWidth + 2*bezelWidthRight)/physicalWidth;
 743             thisReference[0] = osg::Vec2d(tmp, -1);
 744             thisReference[1] = osg::Vec2d(tmp, 1);
 745         } else if (projectionNode->getNameString() == "above-perspective") {
 746             double tmp = (parentInfo->physicalHeight + 2*parentInfo->bezelHeightTop)/parentInfo->physicalHeight;
 747             parentReference[0] = osg::Vec2d(-1, tmp);
 748             parentReference[1] = osg::Vec2d(1, tmp);
 749             tmp = (physicalHeight + 2*bezelHeightBottom)/physicalHeight;
 750             thisReference[0] = osg::Vec2d(-1, -tmp);
 751             thisReference[1] = osg::Vec2d(1, -tmp);
 752         } else if (projectionNode->getNameString() == "below-perspective") {
 753             double tmp = (parentInfo->physicalHeight + 2*parentInfo->bezelHeightBottom)/parentInfo->physicalHeight;
 754             parentReference[0] = osg::Vec2d(-1, -tmp);
 755             parentReference[1] = osg::Vec2d(1, -tmp);
 756             tmp = (physicalHeight + 2*bezelHeightTop)/physicalHeight;
 757             thisReference[0] = osg::Vec2d(-1, tmp);
 758             thisReference[1] = osg::Vec2d(1, tmp);
 759         } else if (projectionNode->getNameString() == "reference-points-perspective") {
 760             SGPropertyNode* parentNode = projectionNode->getNode("parent", true);
 761             SGPropertyNode* thisNode = projectionNode->getNode("this", true);
 762             SGPropertyNode* pointNode;
 763
 764             pointNode = parentNode->getNode("point", 0, true);
 765             parentReference[0][0] = pointNode->getDoubleValue("x", 0)*2/parentInfo->physicalWidth;
 766             parentReference[0][1] = pointNode->getDoubleValue("y", 0)*2/parentInfo->physicalHeight;
 767             pointNode = parentNode->getNode("point", 1, true);
 768             parentReference[1][0] = pointNode->getDoubleValue("x", 0)*2/parentInfo->physicalWidth;
 769             parentReference[1][1] = pointNode->getDoubleValue("y", 0)*2/parentInfo->physicalHeight;
 770
 771             pointNode = thisNode->getNode("point", 0, true);
 772             thisReference[0][0] = pointNode->getDoubleValue("x", 0)*2/physicalWidth;
 773             thisReference[0][1] = pointNode->getDoubleValue("y", 0)*2/physicalHeight;
 774             pointNode = thisNode->getNode("point", 1, true);
 775             thisReference[1][0] = pointNode->getDoubleValue("x", 0)*2/physicalWidth;
 776             thisReference[1][1] = pointNode->getDoubleValue("y", 0)*2/physicalHeight;
 777         }
 778
 779         pOff = osg::Matrix::perspective(45, physicalWidth/physicalHeight, 1, 20000);
 780         cameraFlags |= PROJECTION_ABSOLUTE | ENABLE_MASTER_ZOOM;
 781     } else {
 782         // old style shear parameters
 783         double shearx = cameraNode->getDoubleValue("shear-x", 0);
 784         double sheary = cameraNode->getDoubleValue("shear-y", 0);
 785         pOff.makeTranslate(-shearx, -sheary, 0);
 786     }
 787     const SGPropertyNode* textureNode = cameraNode->getNode("texture");
 788     if (textureNode) {
 789         string texName = textureNode->getStringValue("name");
 790         int tex_width = textureNode->getIntValue("width");
 791         int tex_height = textureNode->getIntValue("height");
 792         TextureRectangle* texture = new TextureRectangle;
 793
 794         texture->setTextureSize(tex_width, tex_height);
 795         texture->setInternalFormat(GL_RGB);
 796         texture->setFilter(Texture::MIN_FILTER, Texture::LINEAR);
 797         texture->setFilter(Texture::MAG_FILTER, Texture::LINEAR);
 798         texture->setWrap(Texture::WRAP_S, Texture::CLAMP_TO_EDGE);
 799         texture->setWrap(Texture::WRAP_T, Texture::CLAMP_TO_EDGE);
 800         camera->setDrawBuffer(GL_FRONT);
 801         camera->setReadBuffer(GL_FRONT);
 802         camera->setRenderTargetImplementation(Camera::FRAME_BUFFER_OBJECT);
 803         camera->attach(Camera::COLOR_BUFFER, texture);
 804         _textureTargets[texName] = texture;
 805     } else {
 806         camera->setDrawBuffer(GL_BACK);
 807         camera->setReadBuffer(GL_BACK);
 808     }
 809     const SGPropertyNode* psNode = cameraNode->getNode("panoramic-spherical");
 810     bool useMasterSceneGraph = !psNode;
 811         CameraInfo* info = globals->get_renderer()->buildRenderingPipeline(this, cameraFlags, camera, vOff, pOff,
 812                                  useMasterSceneGraph);
 813     info->name = cameraNode->getStringValue("name");
 814     info->physicalWidth = physicalWidth;
 815     info->physicalHeight = physicalHeight;
 816     info->bezelHeightTop = bezelHeightTop;
 817     info->bezelHeightBottom = bezelHeightBottom;
 818     info->bezelWidthLeft = bezelWidthLeft;
 819     info->bezelWidthRight = bezelWidthRight;
 820     info->relativeCameraParent = parentCameraIndex;
 821     info->parentReference[0] = parentReference[0];
 822     info->parentReference[1] = parentReference[1];
 823     info->thisReference[0] = thisReference[0];
 824     info->thisReference[1] = thisReference[1];
 825     // If a viewport isn't set on the camera, then it's hard to dig it
 826     // out of the SceneView objects in the viewer, and the coordinates
 827     // of mouse events are somewhat bizzare.
 828     buildViewport(info, viewportNode, window->gc->getTraits());
 829     info->updateCameras();
 830     // Distortion camera needs the viewport which is created by addCamera().
 831     if (psNode) {
 832         info->flags = info->flags | VIEW_ABSOLUTE;
 833         buildDistortionCamera(psNode, camera);
 834     }
 835     return info;
 836 }
 837
 838 CameraInfo* CameraGroup::buildGUICamera(SGPropertyNode* cameraNode,
 839                                         GraphicsWindow* window)
 840 {
 841     WindowBuilder *wBuild = WindowBuilder::getWindowBuilder();
 842     const SGPropertyNode* windowNode = (cameraNode
 843                                         ? cameraNode->getNode("window")
 844                                         : 0);
 845     if (!window && windowNode) {
 846       // New style window declaration / definition
 847       window = wBuild->buildWindow(windowNode);
 848     }
 849
 850     if (!window) { // buildWindow can fail
 851       SG_LOG(SG_VIEW, SG_WARN, "CameraGroup::buildGUICamera: failed to build a window");
 852       return NULL;
 853     }
 854
 855     Camera* camera = new Camera;
 856     camera->setAllowEventFocus(false);
 857     camera->setGraphicsContext(window->gc.get());
 858     camera->setViewport(new Viewport);
 859     // XXX Camera needs to be drawn last; eventually the render order
 860     // should be assigned by a camera manager.
 861     camera->setRenderOrder(osg::Camera::POST_RENDER, 100);
 862         camera->setClearMask(0);
 863     camera->setInheritanceMask(CullSettings::ALL_VARIABLES
 864                                & ~(CullSettings::COMPUTE_NEAR_FAR_MODE
 865                                    | CullSettings::CULLING_MODE
 866 #if defined(HAVE_CULLSETTINGS_CLEAR_MASK)
 867                                    | CullSettings::CLEAR_MASK
 868 #endif
 869                                    ));
 870     camera->setComputeNearFarMode(osg::CullSettings::DO_NOT_COMPUTE_NEAR_FAR);
 871     camera->setCullingMode(osg::CullSettings::NO_CULLING);
 872     camera->setProjectionResizePolicy(Camera::FIXED);
 873     camera->setReferenceFrame(Transform::ABSOLUTE_RF);
 874     const int cameraFlags = GUI | DO_INTERSECTION_TEST;
 875     CameraInfo* result = globals->get_renderer()->buildRenderingPipeline(this, cameraFlags, camera, Matrixd::identity(),
 876                                    Matrixd::identity(), false);
 877     SGPropertyNode* viewportNode = cameraNode->getNode("viewport", true);
 878     buildViewport(result, viewportNode, window->gc->getTraits());
 879
 880     // Disable statistics for the GUI camera.
 881     result->getMainCamera()->setStats(0);
 882     result->updateCameras();
 883     return result;
 884 }
 885
 886 CameraGroup* CameraGroup::buildCameraGroup(osgViewer::Viewer* viewer,
 887                                            SGPropertyNode* gnode)
 888 {
 889     CameraGroup* cgroup = new CameraGroup(viewer);
 890     for (int i = 0; i < gnode->nChildren(); ++i) {
 891         SGPropertyNode* pNode = gnode->getChild(i);
 892         const char* name = pNode->getName();
 893         if (!strcmp(name, "camera")) {
 894             cgroup->buildCamera(pNode);
 895         } else if (!strcmp(name, "window")) {
 896             WindowBuilder::getWindowBuilder()->buildWindow(pNode);
 897         } else if (!strcmp(name, "gui")) {
 898             cgroup->buildGUICamera(pNode);
 899         }
 900     }
 901     bindMemberToNode(gnode, "znear", cgroup, &CameraGroup::_zNear, .1f);
 902     bindMemberToNode(gnode, "zfar", cgroup, &CameraGroup::_zFar, 120000.0f);
 903     bindMemberToNode(gnode, "near-field", cgroup, &CameraGroup::_nearField,
 904                      100.0f);
 905     return cgroup;
 906 }
 907
 908 void CameraGroup::setCameraCullMasks(Node::NodeMask nm)
 909 {
 910     for (CameraIterator i = camerasBegin(), e = camerasEnd(); i != e; ++i) {
 911         CameraInfo* info = i->get();
 912         if (info->flags & GUI)
 913             continue;
 914                 osg::ref_ptr<osg::Camera> farCamera = info->getCamera(CameraInfo::FAR_CAMERA);
 915                 osg::Camera* camera = info->getMainCamera();
 916         if (farCamera.valid() && farCamera->getNodeMask() != 0) {
 917             camera->setCullMask(nm & ~simgear::BACKGROUND_BIT);
 918             camera->setCullMaskLeft(nm & ~simgear::BACKGROUND_BIT);
 919             camera->setCullMaskRight(nm & ~simgear::BACKGROUND_BIT);
 920             farCamera->setCullMask(nm);
 921             farCamera->setCullMaskLeft(nm);
 922             farCamera->setCullMaskRight(nm);
 923         } else {
 924             camera->setCullMask(nm);
 925             camera->setCullMaskLeft(nm);
 926             camera->setCullMaskRight(nm);
 927         }
 928     }
 929 }
 930
 931 void CameraGroup::resized()
 932 {
 933     for (CameraIterator i = camerasBegin(), e = camerasEnd(); i != e; ++i) {
 934         CameraInfo *info = i->get();
 935                 const Viewport* viewport = info->getMainCamera()->getViewport();
 936         info->x = viewport->x();
 937         info->y = viewport->y();
 938         info->width = viewport->width();
 939         info->height = viewport->height();
 940     }
 941 }
 942
 943 const CameraInfo* CameraGroup::getGUICamera() const
 944 {
 945     ConstCameraIterator result
 946         = std::find_if(camerasBegin(), camerasEnd(),
 947                    FlagTester<CameraInfo>(GUI));
 948     if (result == camerasEnd()) {
 949         return NULL;
 950     }
 951
 952     return *result;
 953 }
 954
 955 Camera* getGUICamera(CameraGroup* cgroup)
 956 {
 957     const CameraInfo* info = cgroup->getGUICamera();
 958     if (!info) {
 959         return NULL;
 960     }
 961
 962     return info->getMainCamera();
 963 }
 964
 965 static bool computeCameraIntersection(const CameraInfo* cinfo,
 966                                       const osgGA::GUIEventAdapter* ea,
 967                                       osgUtil::LineSegmentIntersector::Intersections& intersections)
 968 {
 969   using osgUtil::Intersector;
 970   using osgUtil::LineSegmentIntersector;
 971   double x, y;
 972   eventToWindowCoords(ea, x, y);
 973
 974   if (!(cinfo->flags & CameraGroup::DO_INTERSECTION_TEST))
 975     return false;
 976
 977   const Camera* camera = cinfo->getMainCamera();
 978   if (camera->getGraphicsContext() != ea->getGraphicsContext())
 979     return false;
 980
 981   const Viewport* viewport = camera->getViewport();
 982   double epsilon = 0.5;
 983   if (!(x >= viewport->x() - epsilon
 984         && x < viewport->x() + viewport->width() -1.0 + epsilon
 985         && y >= viewport->y() - epsilon
 986         && y < viewport->y() + viewport->height() -1.0 + epsilon))
 987     return false;
 988
 989   Vec4d start(x, y, 0.0, 1.0);
 990   Vec4d end(x, y, 1.0, 1.0);
 991   Matrix windowMat = viewport->computeWindowMatrix();
 992   Matrix startPtMat = Matrix::inverse(camera->getProjectionMatrix()
 993                                       * windowMat);
 994   Matrix endPtMat;
 995   const Camera* farCamera = cinfo->getCamera( CameraInfo::FAR_CAMERA );
 996   if (!farCamera || farCamera->getNodeMask() == 0)
 997     endPtMat = startPtMat;
 998   else
 999     endPtMat = Matrix::inverse(farCamera->getProjectionMatrix()
1000                                * windowMat);
1001   start = start * startPtMat;
1002   start /= start.w();
1003   end = end * endPtMat;
1004   end /= end.w();
1005   ref_ptr<LineSegmentIntersector> picker
1006   = new LineSegmentIntersector(Intersector::VIEW,
1007                                Vec3d(start.x(), start.y(), start.z()),
1008                                Vec3d(end.x(), end.y(), end.z()));
1009   osgUtil::IntersectionVisitor iv(picker.get());
1010   const_cast<Camera*>(camera)->accept(iv);
1011   if (picker->containsIntersections()) {
1012     intersections = picker->getIntersections();
1013     return true;
1014   }
1015
1016   return false;
1017 }
1018
1019 bool computeIntersections(const CameraGroup* cgroup,
1020                           const osgGA::GUIEventAdapter* ea,
1021                           osgUtil::LineSegmentIntersector::Intersections& intersections)
1022 {
1023     // test the GUI first
1024     const CameraInfo* guiCamera = cgroup->getGUICamera();
1025     if (guiCamera && computeCameraIntersection(guiCamera, ea, intersections))
1026         return true;
1027
1028     // Find camera that contains event
1029     for (CameraGroup::ConstCameraIterator iter = cgroup->camerasBegin(),
1030              e = cgroup->camerasEnd();
1031          iter != e;
1032          ++iter) {
1033         const CameraInfo* cinfo = iter->get();
1034         if (cinfo == guiCamera)
1035             continue;
1036
1037         if (computeCameraIntersection(cinfo, ea, intersections))
1038             return true;
1039     }
1040
1041     intersections.clear();
1042     return false;
1043 }
1044
1045 void warpGUIPointer(CameraGroup* cgroup, int x, int y)
1046 {
1047     using osgViewer::GraphicsWindow;
1048     Camera* guiCamera = getGUICamera(cgroup);
1049     if (!guiCamera)
1050         return;
1051     Viewport* vport = guiCamera->getViewport();
1052     GraphicsWindow* gw
1053         = dynamic_cast<GraphicsWindow*>(guiCamera->getGraphicsContext());
1054     if (!gw)
1055         return;
1056     globals->get_renderer()->getEventHandler()->setMouseWarped();
1057     // Translate the warp request into the viewport of the GUI camera,
1058     // send the request to the window, then transform the coordinates
1059     // for the Viewer's event queue.
1060     double wx = x + vport->x();
1061     double wyUp = vport->height() + vport->y() - y;
1062     double wy;
1063     const GraphicsContext::Traits* traits = gw->getTraits();
1064     if (gw->getEventQueue()->getCurrentEventState()->getMouseYOrientation()
1065         == osgGA::GUIEventAdapter::Y_INCREASING_DOWNWARDS) {
1066         wy = traits->height - wyUp;
1067     } else {
1068         wy = wyUp;
1069     }
1070     gw->getEventQueue()->mouseWarped(wx, wy);
1071     gw->requestWarpPointer(wx, wy);
1072     osgGA::GUIEventAdapter* eventState
1073         = cgroup->getViewer()->getEventQueue()->getCurrentEventState();
1074     double viewerX
1075         = (eventState->getXmin()
1076            + ((wx / double(traits->width))
1077               * (eventState->getXmax() - eventState->getXmin())));
1078     double viewerY
1079         = (eventState->getYmin()
1080            + ((wyUp / double(traits->height))
1081               * (eventState->getYmax() - eventState->getYmin())));
1082     cgroup->getViewer()->getEventQueue()->mouseWarped(viewerX, viewerY);
1083 }
1084 }