bool boundSort(const osg::ref_ptr< osg::Node> &i, const osg::ref_ptr< osg::Node> &j)
{
osg::BoundingSphere bsI = i->getBound();
osg::BoundingSphere bsJ = j->getBound();
return bsI.center().x() < bsJ.center().x();
}
int main( int argc, char **argv )
{
// use an ArgumentParser object to manage the program arguments.
osg::ArgumentParser arguments(&argc,argv);
// set up the usage document, in case we need to print out how to use this program.
arguments.getApplicationUsage()->setApplicationName(arguments.getApplicationName());
arguments.getApplicationUsage()->setCommandLineUsage(arguments.getApplicationName()+" [options] filename ...");
arguments.getApplicationUsage()->addCommandLineOption("--image <filename>","Load an image and render it on a quad");
arguments.getApplicationUsage()->addCommandLineOption("--dem <filename>","Load an image/DEM and render it on a HeightField");
arguments.getApplicationUsage()->addCommandLineOption("-h or --help","Display command line parameters");
arguments.getApplicationUsage()->addCommandLineOption("--help-env","Display environmental variables available");
arguments.getApplicationUsage()->addCommandLineOption("--help-keys","Display keyboard & mouse bindings available");
arguments.getApplicationUsage()->addCommandLineOption("--help-all","Display all command line, env vars and keyboard & mouse bindings.");
arguments.getApplicationUsage()->addCommandLineOption("--dragger <draggername>","Use the specified dragger for manipulation [TabPlaneDragger, TabPlaneTrackballDragger, TrackballDragger, Translate1DDragger, Translate2DDragger, TranslateAxisDragger, TabBoxDragger, TranslatePlaneDragger, Scale1DDragger, Scale2DDragger, RotateCylinderDragger, RotateSphereDragger]");
arguments.getApplicationUsage()->addCommandLineOption("--fixedDraggerSize","Fix the size of the dragger geometry in the screen space");
bool fixedSizeInScreen = false;
while (arguments.read("--fixedDraggerSize")) { fixedSizeInScreen = true; }
// construct the viewer.
osgViewer::Viewer viewer(arguments);
// add the window size toggle handler
viewer.addEventHandler(new osgViewer::WindowSizeHandler);
// get details on keyboard and mouse bindings used by the viewer.
viewer.getUsage(*arguments.getApplicationUsage());
if (arguments.read("--test-NodeMask"))
{
const osg::ref_ptr<osg::Group> group = new osg::Group();
group->setNodeMask(0);
const osg::ref_ptr<osgManipulator::AntiSquish> antiSquish = new osgManipulator::AntiSquish();
group->addChild(antiSquish.get());
const osg::ref_ptr<osg::Node> node = new osg::Node();
node->setInitialBound(osg::BoundingSphere(osg::Vec3(0.0, 0.0, 0.0), 1.0));
antiSquish->addChild(node.get());
group->getBound();
return 1;
}
// if user request help write it out to cout.
bool helpAll = arguments.read("--help-all");
unsigned int helpType = ((helpAll || arguments.read("-h") || arguments.read("--help"))? osg::ApplicationUsage::COMMAND_LINE_OPTION : 0 ) |
((helpAll || arguments.read("--help-env"))? osg::ApplicationUsage::ENVIRONMENTAL_VARIABLE : 0 ) |
((helpAll || arguments.read("--help-keys"))? osg::ApplicationUsage::KEYBOARD_MOUSE_BINDING : 0 );
if (helpType)
{
arguments.getApplicationUsage()->write(std::cout, helpType);
return 1;
}
// report any errors if they have occurred when parsing the program arguments.
if (arguments.errors())
{
arguments.writeErrorMessages(std::cout);
return 1;
}
std::string dragger_name = "TabBoxDragger";
arguments.read("--dragger", dragger_name);
osg::Timer_t start_tick = osg::Timer::instance()->tick();
// read the scene from the list of file specified command line args.
osg::ref_ptr<osg::Node> loadedModel = osgDB::readRefNodeFiles(arguments);
// if no model has been successfully loaded report failure.
bool tragger2Scene(true);
if (!loadedModel)
{
//std::cout << arguments.getApplicationName() <<": No data loaded" << std::endl;
//return 1;
loadedModel = createDemoScene(fixedSizeInScreen);
tragger2Scene=false;
}
// any option left unread are converted into errors to write out later.
arguments.reportRemainingOptionsAsUnrecognized();
// report any errors if they have occurred when parsing the program arguments.
if (arguments.errors())
{
arguments.writeErrorMessages(std::cout);
}
osg::Timer_t end_tick = osg::Timer::instance()->tick();
std::cout << "Time to load = "<<osg::Timer::instance()->delta_s(start_tick,end_tick)<<std::endl;
// optimize the scene graph, remove redundant nodes and state etc.
osgUtil::Optimizer optimizer;
optimizer.optimize(loadedModel);
// pass the loaded scene graph to the viewer.
if ( tragger2Scene ) {
viewer.setSceneData(addDraggerToScene(loadedModel.get(), dragger_name, fixedSizeInScreen));
} else {
viewer.setSceneData(loadedModel);
}
return viewer.run();
}
osg::ref_ptr<osg::Node> decorate_with_clip_node(const osg::ref_ptr<osg::Node>& subgraph)
{
osg::ref_ptr<osg::Group> rootnode = new osg::Group;
// create wireframe view of the model so the user can see
// what parts are being culled away.
osg::StateSet* stateset = new osg::StateSet;
//osg::Material* material = new osg::Material;
osg::PolygonMode* polymode = new osg::PolygonMode;
polymode->setMode(osg::PolygonMode::FRONT_AND_BACK,osg::PolygonMode::LINE);
stateset->setAttributeAndModes(polymode,osg::StateAttribute::OVERRIDE|osg::StateAttribute::ON);
osg::Group* wireframe_subgraph = new osg::Group;
wireframe_subgraph->setStateSet(stateset);
wireframe_subgraph->addChild(subgraph);
rootnode->addChild(wireframe_subgraph);
/*
// simple approach to adding a clipnode above a subgraph.
// create clipped part.
osg::ClipNode* clipped_subgraph = new osg::ClipNode;
osg::BoundingSphere bs = subgraph->getBound();
bs.radius()*= 0.4f;
osg::BoundingBox bb;
bb.expandBy(bs);
clipped_subgraph->createClipBox(bb);
clipped_subgraph->addChild(subgraph);
rootnode->addChild(clipped_subgraph);
*/
// more complex approach to managing ClipNode, allowing
// ClipNode node to be transformed independently from the subgraph
// that it is clipping.
osg::MatrixTransform* transform= new osg::MatrixTransform;
osg::NodeCallback* nc = new osg::AnimationPathCallback(subgraph->getBound().center(),osg::Vec3(0.0f,0.0f,1.0f),osg::inDegrees(45.0f));
transform->setUpdateCallback(nc);
osg::ClipNode* clipnode = new osg::ClipNode;
osg::BoundingSphere bs = subgraph->getBound();
bs.radius()*= 0.4f;
osg::BoundingBox bb;
bb.expandBy(bs);
clipnode->createClipBox(bb);
clipnode->setCullingActive(false);
transform->addChild(clipnode);
rootnode->addChild(transform);
// create clipped part.
osg::Group* clipped_subgraph = new osg::Group;
clipped_subgraph->setStateSet(clipnode->getStateSet());
clipped_subgraph->addChild(subgraph);
rootnode->addChild(clipped_subgraph);
return rootnode;
}
//创建预渲染场景
osg::ref_ptr<osg::Node> createPreRenderSubGraph(osg::ref_ptr<osg::Node> subgraph,
unsigned tex_width,
unsigned tex_height,
osg::Camera::RenderTargetImplementation renderImplementation,
bool useImage)
{
if (!subgraph) return 0;
//创建一个包含预渲camera的 Group 节点
osg::ref_ptr<osg::Group> parent = new osg::Group;
//创建纹理，用来绑定相机渲染的结果
osg::ref_ptr<osg::Texture> texture = 0;
{
osg::ref_ptr<osg::Texture2D> texture2D = new osg::Texture2D;
texture2D->setTextureSize(tex_width, tex_height);
texture2D->setInternalFormat(GL_RGBA);
texture2D->setFilter(osg::Texture2D::MIN_FILTER,osg::Texture2D::LINEAR);
texture2D->setFilter(osg::Texture2D::MAG_FILTER,osg::Texture2D::LINEAR);
texture = texture2D;
}
//创建一个用来浏览的四边形几何体
{
osg::ref_ptr<osg::Geometry> polyGeom = new osg::Geometry();
//设置该几何体不使用显示列表
polyGeom->setSupportsDisplayList(false);
float height = 100.0f;
float width = 200.0f;
//创建顶点数组，并添加数据
osg::ref_ptr<osg::Vec3Array> vertices = new osg::Vec3Array;
vertices->push_back( osg::Vec3(0.0f,0.0f,0.0f) );
vertices->push_back( osg::Vec3(width,0.0f,0.0f) );
vertices->push_back( osg::Vec3(width,0.0f,height) );
vertices->push_back( osg::Vec3(0.0f,0.0f,height) );
//创建纹理数组，并添加数据
osg::ref_ptr<osg::Vec2Array> texcoords = new osg::Vec2Array();
texcoords->push_back( osg::Vec2(0.0f,0.0f) );
texcoords->push_back( osg::Vec2(1.0f,0.0f) );
texcoords->push_back( osg::Vec2(1.0f,1.0f) );
texcoords->push_back( osg::Vec2(0.0f,1.0f) );
polyGeom->setVertexArray(vertices.get());
//使用vbo扩展
// {
// osg::ref_ptr<osg::VertexBufferObject> vbObject = new osg::VertexBufferObject;
// vertices->setVertexBufferObject(vbObject);
//
// polyGeom->setUseVertexBufferObjects(true);
// }
polyGeom->setTexCoordArray(0,texcoords.get());
//创建颜色数组，并设置绑定方式及添加数据
// osg::ref_ptr<osg::Vec4Array> colors = new osg::Vec4Array;
// colors->push_back(osg::Vec4(1.0f,1.0f,1.0f,1.0f));
// polyGeom->setColorArray(colors.get());
// polyGeom->setColorBinding(osg::Geometry::BIND_OVERALL);
polyGeom->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::QUADS,0,vertices->size()));
//现在我们需要将纹理附加到该几何体上，我们创建一个包含该纹理的StateSet
osg::ref_ptr<osg::StateSet> stateset = new osg::StateSet;
stateset->setTextureAttributeAndModes(0, texture,osg::StateAttribute::ON);
polyGeom->setStateSet(stateset);
osg::ref_ptr<osg::Geode> geode = new osg::Geode();
geode->addDrawable(polyGeom.get());
parent->addChild(geode.get());
}
// 需要创建一个相机节点，用来渲染到该纹理(RTT)
{
osg::ref_ptr<osg::Camera> camera = new osg::Camera;
//设置背景色及清除颜色和深度缓存
camera->setClearColor(osg::Vec4(0.1f,0.1f,0.3f,1.0f));
camera->setClearMask(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
//获得该节点的范围盒
const osg::BoundingSphere& bs = subgraph->getBound();
if (!bs.valid())
{
return subgraph.get();
}
float znear = 1.0f*bs.radius();
float zfar = 3.0f*bs.radius();
float proj_top = 0.25f*znear;
float proj_right = 0.5f*znear;
znear *= 0.9f;
zfar *= 1.1f;
//设置投影矩阵.
// camera->setProjectionMatrixAsFrustum(-proj_right,proj_right,-proj_top,proj_top,znear,zfar);
//将相机对准该子场景
camera->setReferenceFrame(osg::Transform::ABSOLUTE_RF);
// camera->setViewMatrixAsLookAt(bs.center()-osg::Vec3(0.0f,2.0f,0.0f)*bs.radius(),bs.center(),osg::Vec3(0.0f,0.0f,1.0f));
//设置视口
camera->setViewport(0,0,tex_width,tex_height);
//设置相机的渲染序列
camera->setRenderOrder(osg::Camera::PRE_RENDER);
//设置相机渲染通过 OpenGL frame buffer object 实现
camera->setRenderTargetImplementation(renderImplementation);
if (useImage)
{
osg::ref_ptr<osg::Image> image = new osg::Image;
//image->allocateImage(tex_width, tex_height, 1, GL_RGBA, GL_UNSIGNED_BYTE);
image->allocateImage(tex_width, tex_height, 1, GL_RGBA, GL_FLOAT);
//将Image附加到相机的COLOR_BUFFER
camera->attach(osg::Camera::COLOR_BUFFER, image.get());
//添加相机的绘制后回调，修改images数据
camera->setPostDrawCallback(new MyCameraPostDrawCallback(image.get()));
//这里我们不直接将相机的COLOR_BUFFER附加到该纹理上，是为了修改渲染后的图像数据
texture->setImage(0, image.get());
}
else
{
//直接将该纹理附加到相机的颜色缓存.
camera->attach(osg::Camera::COLOR_BUFFER, texture.get());
}
//添加要绘制的子场景
camera->addChild(subgraph.get());
parent->addChild(camera.get());
}
return parent.get();
}
osg::ref_ptr<osg::Node> createRoom(const osg::ref_ptr<osg::Node>& loadedModel)
{
// default scale for this model.
osg::BoundingSphere bs(osg::Vec3(0.0f,0.0f,0.0f),1.0f);
osg::Group* root = new osg::Group;
if (loadedModel)
{
const osg::BoundingSphere& loaded_bs = loadedModel->getBound();
osg::PositionAttitudeTransform* pat = new osg::PositionAttitudeTransform();
pat->setPivotPoint(loaded_bs.center());
pat->setUpdateCallback(new ModelTransformCallback(loaded_bs));
pat->addChild(loadedModel);
bs = pat->getBound();
root->addChild(pat);
}
bs.radius()*=1.5f;
// create a bounding box, which we'll use to size the room.
osg::BoundingBox bb;
bb.expandBy(bs);
// create statesets.
osg::StateSet* rootStateSet = new osg::StateSet;
root->setStateSet(rootStateSet);
osg::StateSet* wall = new osg::StateSet;
wall->setMode(GL_CULL_FACE,osg::StateAttribute::ON);
osg::StateSet* floor = new osg::StateSet;
floor->setMode(GL_CULL_FACE,osg::StateAttribute::ON);
osg::StateSet* roof = new osg::StateSet;
roof->setMode(GL_CULL_FACE,osg::StateAttribute::ON);
osg::Geode* geode = new osg::Geode;
// create front side.
geode->addDrawable(createWall(bb.corner(0),
bb.corner(4),
bb.corner(1),
wall));
// right side
geode->addDrawable(createWall(bb.corner(1),
bb.corner(5),
bb.corner(3),
wall));
// left side
geode->addDrawable(createWall(bb.corner(2),
bb.corner(6),
bb.corner(0),
wall));
// back side
geode->addDrawable(createWall(bb.corner(3),
bb.corner(7),
bb.corner(2),
wall));
// floor
geode->addDrawable(createWall(bb.corner(0),
bb.corner(1),
bb.corner(2),
floor));
// roof
geode->addDrawable(createWall(bb.corner(6),
bb.corner(7),
bb.corner(4),
roof));
root->addChild(geode);
root->addChild(createLights(bb,rootStateSet));
return root;
}