-
简介
这节课主要介绍了如何使用OpenGL中的模板缓冲区和裁剪平面来产生镜子反射的效果，关于模板缓冲区的内容可以参考另一篇文章OpenGL模板缓冲区---Stencil Buffer
首先我们需要在模板缓冲区中将地面(类似镜子)绘制出来，同时并不会在颜色缓冲区中绘制出镜面。通过设置颜色掩码glColorMask可以做到这一点
- //创建模板缓冲区中的镜面(不可见)
- //深度测试关闭意味着深度测试总是通过
- osg::Geode *stencilFloorGeode = createFloor();
- osg::Stencil *floorStencil = new osg::Stencil;
- floorStencil->setFunction(osg::Stencil::ALWAYS, 1, 1);
- floorStencil->setOperation(osg::Stencil::KEEP, osg::Stencil::KEEP, osg::Stencil::REPLACE);
- osg::ColorMask *colorMask1 = new osg::ColorMask(0, 0, 0, 0);
- stencilFloorGeode->getOrCreateStateSet()->setMode(GL_DEPTH_TEST, false);
- stencilFloorGeode->getOrCreateStateSet()->setAttribute(colorMask1, osg::StateAttribute::ON);
- stencilFloorGeode->getOrCreateStateSet()->setAttributeAndModes(floorStencil);
- stencilFloorGeode->getOrCreateStateSet()->setMode(GL_LIGHTING, false);
此时在模板缓冲区中存在这一个地面(全部为1，其他模板缓冲区的部分都是0)，这时候我们在绘制球体在镜面中的镜像，我们让所有是1的地方进行绘制，这样绘制的球体只有在镜面的地方才能绘制出来，其他地方都无法绘制。
- osg::Group *reflectionBall = createSphere();
- osg::Stencil *stencilBall = new osg::Stencil;
- stencilBall->setFunction(osg::Stencil::EQUAL, 1, 1);
- stencilBall->setOperation(osg::Stencil::KEEP, osg::Stencil::KEEP, osg::Stencil::KEEP);
- osg::ClipPlane *clipPlane = new osg::ClipPlane(0, 0.0, -1.0, 0.0, 0.0);
- reflectionBall->getOrCreateStateSet()->setAttributeAndModes(stencilBall, osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE);
- reflectionBall->getOrCreateStateSet()->setAttributeAndModes(clipPlane);
- osg::Geode *colorBufferFloor = createFloor();
- osg::BlendFunc *blendFunc = new osg::BlendFunc(osg::BlendFunc::SRC_ALPHA, osg::BlendFunc::ONE_MINUS_SRC_ALPHA);
- osg::Geometry *floorGeometry = colorBufferFloor->getDrawable(0)->asGeometry();
- if (floorGeometry)
- {
- osg::Vec4Array *colorArray = new osg::Vec4Array;
- colorArray->push_back(osg::Vec4(1.0f, 1.0f, 1.0f, 0.8f));
- floorGeometry->setColorArray(colorArray, osg::Array::BIND_OVERALL);
- floorGeometry->getOrCreateStateSet()->setAttributeAndModes(blendFunc);
- floorGeometry->getOrCreateStateSet()->setMode(GL_LIGHTING, osg::StateAttribute::OFF);
- }
- osg::Group *realBall = createSphere();
- transMT->addChild(rotateX);
- rotateX->addChild(rotateY);
- rotateY->addChild(realBall);
将所有绘制好的部分添加到根节点下面：
- //所有部分添加到场景节点
- root->addChild(tiltMT);
- tiltMT->addChild(stencilFloorGeode);
- tiltMT->addChild(reflectScaleMT);
- tiltMT->addChild(colorBufferFloor);
- tiltMT->addChild(transMT);
在我们操作真实球体的时候，镜像的球体实际上也在跟着上下运动，通过反转Y轴实现了这样的效果：
- osg::MatrixTransform *reflectScaleMT = new osg::MatrixTransform;
- reflectScaleMT->setMatrix(osg::Matrix::scale(1.0, -1.0, 1.0));
编译运行程序：
附：本课源码（源码中可能存在着错误和不足，仅供参考）
- /************************************************************************\
- * osgNeHe - Copyright (C) 2013-2014 Frank He
- *
- * This library is open source and may be redistributed and/or modified under
- * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
- * (at your option) any later version. The full license is in LICENSE file
- * included with this distribution, and on the openscenegraph.org website.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
- *
- * A HUGE thanks to NeHe for the OpenGL tutorials< http://nehe.gamedev.net >
- *
- * If you've found this code useful, Please let me know.
- * My E-mail: < hzhxfrank@gmail.com >
- * My Blog: < http://blog.youkuaiyun.com/csxiaoshui >
- *
- \************************************************************************/
- #include "../osgNeHe.h"
- #include <QtCore/QTimer>
- #include <QtGui/QApplication>
- #include <QtGui/QVBoxLayout>
- #include <osgViewer/Viewer>
- #include <osgDB/ReadFile>
- #include <osgQt/GraphicsWindowQt>
- #include <osg/MatrixTransform>
- #include <osg/ShapeDrawable>
- #include <osg/TexGen>
- #include <osg/BlendFunc>
- #include <osg/Texture2D>
- #include <osg/ColorMask>
- #include <osg/Stencil>
- #include <osg/ClipPlane>
- //
- static GLfloat LightAmb[] = {0.7f, 0.7f, 0.7f, 1.0f};
- static GLfloat LightDif[] = {1.0f, 1.0f, 1.0f, 1.0f};
- static GLfloat LightPos[] = {4.0f, 4.0f, 6.0f, 1.0f};
- GLfloat xrot = 0.0f;
- GLfloat yrot = 0.0f;
- GLfloat xrotspeed = 0.0f;
- GLfloat yrotspeed = 0.0f;
- GLfloat zoom = -7.0f;
- GLfloat height = 2.0f;
- osg::MatrixTransform *g_ZoomMT = NULL;
- osg::MatrixTransform *g_ReflectTrans = NULL;
- osg::MatrixTransform *g_ReflectRotX = NULL;
- osg::MatrixTransform *g_ReflectRotY = NULL;
- osg::MatrixTransform *g_Trans = NULL;
- osg::MatrixTransform *g_RotX = NULL;
- osg::MatrixTransform *g_RotY = NULL;
- osg::Group* createSphere()
- {
- osg::Group *sphereGroup = new osg::Group;
- osg::Geode *sphereGeode1 = new osg::Geode;
- osg::Geode *sphereGeode2 = new osg::Geode;
- osg::ShapeDrawable *shapeDrawable1 = new osg::ShapeDrawable;
- shapeDrawable1->setShape(new osg::Sphere(osg::Vec3(0,0,0), 0.5f));
- shapeDrawable1->setColor(osg::Vec4(1.0, 1.0, 1.0, 1.0));
- osg::Texture2D *texture1 = new osg::Texture2D;
- texture1->setImage(osgDB::readImageFile("Data/Ball.bmp"));
- texture1->setFilter(osg::Texture::MAG_FILTER, osg::Texture::LINEAR);
- texture1->setFilter(osg::Texture::MIN_FILTER, osg::Texture::LINEAR);
- shapeDrawable1->getOrCreateStateSet()->setTextureAttributeAndModes(0, texture1);
- sphereGeode1->addDrawable(shapeDrawable1);
- osg::ShapeDrawable *shapeDrawable2 = new osg::ShapeDrawable;
- shapeDrawable2->setShape(new osg::Sphere(osg::Vec3(0,0,0), 0.5f));
- shapeDrawable2->setColor(osg::Vec4(1.0f, 1.0f, 1.0f, 0.4f));
- osg::Texture2D *texture2 = new osg::Texture2D;
- texture2->setImage(osgDB::readImageFile("Data/EnvRoll.bmp"));
- texture2->setFilter(osg::Texture::MAG_FILTER, osg::Texture::LINEAR);
- texture2->setFilter(osg::Texture::MIN_FILTER, osg::Texture::LINEAR);
- shapeDrawable2->getOrCreateStateSet()->setTextureAttributeAndModes(0, texture2);
- osg::BlendFunc *blendFunc = new osg::BlendFunc(GL_SRC_ALPHA, GL_ONE);
- shapeDrawable2->getOrCreateStateSet()->setAttributeAndModes(blendFunc);
- osg::TexGen *texGen = new osg::TexGen;
- texGen->setMode(osg::TexGen::SPHERE_MAP);
- shapeDrawable2->getOrCreateStateSet()->setTextureAttributeAndModes(0, texGen);
- sphereGeode2->addDrawable(shapeDrawable2);
- sphereGroup->addChild(sphereGeode1);
- sphereGroup->addChild(sphereGeode2);
- return sphereGroup;
- }
- osg::Geode* createFloor()
- {
- osg::Geode *geode1 = new osg::Geode;
- osg::Geometry *geometry1 = new osg::Geometry;
- osg::Vec3Array *vertexArray1 = new osg::Vec3Array;
- vertexArray1->push_back(osg::Vec3(-2.0, 0.0, 2.0));
- vertexArray1->push_back(osg::Vec3(-2.0, 0.0,-2.0));
- vertexArray1->push_back(osg::Vec3(2.0, 0.0,-2.0));
- vertexArray1->push_back(osg::Vec3(2.0, 0.0, 2.0));
- geometry1->setVertexArray(vertexArray1);
- osg::Vec2Array *textureArray1 = new osg::Vec2Array;
- textureArray1->push_back(osg::Vec2(0.0f, 1.0f));
- textureArray1->push_back(osg::Vec2(0.0f, 0.0f));
- textureArray1->push_back(osg::Vec2(1.0f, 0.0f));
- textureArray1->push_back(osg::Vec2(1.0f, 1.0f));
- osg::Texture2D *texture1 = new osg::Texture2D;
- texture1->setImage(osgDB::readImageFile("Data/EnvWall.bmp"));
- texture1->setFilter(osg::Texture::MIN_FILTER, osg::Texture::LINEAR);
- texture1->setFilter(osg::Texture::MAG_FILTER, osg::Texture::LINEAR);
- geometry1->setTexCoordArray(0, textureArray1);
- geometry1->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::QUADS, 0, 4));
- geometry1->getOrCreateStateSet()->setTextureAttributeAndModes(0, texture1);
- geode1->addDrawable(geometry1);
- return geode1;
- }
- //
- //
- class RotAxisCallback : public osg::NodeCallback
- {
- public:
- RotAxisCallback(const osg::Vec3& axis, double rotSpeed = 0.0, double currentAngle = 0.0)
- : _rotAxis(axis), _rotSpeed(rotSpeed), _currentAngle(currentAngle){ }
- virtual void operator()(osg::Node* node, osg::NodeVisitor* nv)
- {
- osg::MatrixTransform *rotMT = dynamic_cast<osg::MatrixTransform*>(node);
- if (!rotMT)
- return;
- rotMT->setMatrix(osg::Matrix::rotate(_currentAngle, _rotAxis));
- _currentAngle += _rotSpeed;
- traverse(node, nv);
- }
- void setRotateSpeed(double speed)
- {
- _rotSpeed = speed;
- }
- double getRotateSpeed() const
- {
- return _rotSpeed;
- }
- private:
- osg::Vec3 _rotAxis;
- double _currentAngle;
- double _rotSpeed;
- };
- //
- class ManipulatorSceneHandler : public osgGA::GUIEventHandler
- {
- public:
- ManipulatorSceneHandler()
- {
- }
- virtual bool handle(const osgGA::GUIEventAdapter& ea, osgGA::GUIActionAdapter& aa)
- {
- osgViewer::Viewer *viewer = dynamic_cast<osgViewer::Viewer*>(&aa);
- if (!viewer)
- return false;
- if (!viewer->getSceneData())
- return false;
- if (ea.getHandled())
- return false;
- osg::Group *root = viewer->getSceneData()->asGroup();
- switch(ea.getEventType())
- {
- case(osgGA::GUIEventAdapter::KEYDOWN):
- {
- if (ea.getKey() == osgGA::GUIEventAdapter::KEY_Left)
- {
- if (!g_RotY|| !g_ReflectRotY)
- return false;
- RotAxisCallback *rotCallback = dynamic_cast<RotAxisCallback*>(g_RotY->getUpdateCallback());
- RotAxisCallback *rotCallbackReflect = dynamic_cast<RotAxisCallback*>(g_ReflectRotY->getUpdateCallback());
- if (!rotCallback || !rotCallbackReflect)
- return false;
- double speed = rotCallback->getRotateSpeed();
- speed -= 0.02;
- rotCallback->setRotateSpeed(speed);
- speed = rotCallbackReflect->getRotateSpeed();
- speed -= 0.02;
- rotCallbackReflect->setRotateSpeed(speed);
- }
- if (ea.getKey() == osgGA::GUIEventAdapter::KEY_Right)
- {
- if (!g_RotY|| !g_ReflectRotY)
- return false;
- RotAxisCallback *rotCallback = dynamic_cast<RotAxisCallback*>(g_RotY->getUpdateCallback());
- RotAxisCallback *rotCallbackReflect = dynamic_cast<RotAxisCallback*>(g_ReflectRotY->getUpdateCallback());
- if (!rotCallback || !rotCallbackReflect)
- return false;
- double speed = rotCallback->getRotateSpeed();
- speed += 0.02;
- rotCallback->setRotateSpeed(speed);
- speed = rotCallbackReflect->getRotateSpeed();
- speed += 0.02;
- rotCallbackReflect->setRotateSpeed(speed);
- }
- if (ea.getKey() == osgGA::GUIEventAdapter::KEY_Up)
- {
- if (!g_RotX|| !g_ReflectRotX)
- return false;
- RotAxisCallback *rotCallback = dynamic_cast<RotAxisCallback*>(g_RotX->getUpdateCallback());
- RotAxisCallback *rotCallbackReflect = dynamic_cast<RotAxisCallback*>(g_ReflectRotX->getUpdateCallback());
- if (!rotCallback || !rotCallbackReflect)
- return false;
- double speed = rotCallback->getRotateSpeed();
- speed -= 0.02;
- rotCallback->setRotateSpeed(speed);
- speed = rotCallbackReflect->getRotateSpeed();
- speed -= 0.02;
- rotCallbackReflect->setRotateSpeed(speed);
- }
- if (ea.getKey()== osgGA::GUIEventAdapter::KEY_Down)
- {
- if (!g_RotX|| !g_ReflectRotX)
- return false;
- RotAxisCallback *rotCallback = dynamic_cast<RotAxisCallback*>(g_RotX->getUpdateCallback());
- RotAxisCallback *rotCallbackReflect = dynamic_cast<RotAxisCallback*>(g_ReflectRotX->getUpdateCallback());
- if (!rotCallback || !rotCallbackReflect)
- return false;
- double speed = rotCallback->getRotateSpeed();
- speed += 0.02;
- rotCallback->setRotateSpeed(speed);
- speed = rotCallbackReflect->getRotateSpeed();
- speed += 0.02;
- rotCallbackReflect->setRotateSpeed(speed);
- }
- if (ea.getKey()== osgGA::GUIEventAdapter::KEY_Page_Up)
- {
- if (!g_Trans || !g_ReflectTrans)
- return false;
- osg::Matrix transMatrix = g_Trans->getMatrix();
- transMatrix.setTrans(transMatrix.getTrans() + osg::Vec3(0, 0.1, 0));
- g_Trans->setMatrix(transMatrix);
- osg::Matrix reflectTransMatrix = g_ReflectTrans->getMatrix();
- reflectTransMatrix.setTrans(reflectTransMatrix.getTrans() + osg::Vec3(0, 0.1, 0));
- g_ReflectTrans->setMatrix(reflectTransMatrix);
- }
- if (ea.getKey()== osgGA::GUIEventAdapter::KEY_Page_Down)
- {
- if (!g_Trans || !g_ReflectTrans)
- return false;
- osg::Matrix transMatrix = g_Trans->getMatrix();
- transMatrix.setTrans(transMatrix.getTrans() + osg::Vec3(0, -0.1, 0));
- g_Trans->setMatrix(transMatrix);
- osg::Matrix reflectTransMatrix = g_ReflectTrans->getMatrix();
- reflectTransMatrix.setTrans(reflectTransMatrix.getTrans() + osg::Vec3(0, -0.1, 0));
- g_ReflectTrans->setMatrix(reflectTransMatrix);
- }
- if (ea.getKey()== osgGA::GUIEventAdapter::KEY_A)
- {
- if (!g_ZoomMT)
- return false;
- osg::Matrix transMatrix = g_ZoomMT->getMatrix();
- transMatrix.setTrans(transMatrix.getTrans() + osg::Vec3(0, 0, -0.1));
- g_ZoomMT->setMatrix(transMatrix);
- }
- if (ea.getKey()== osgGA::GUIEventAdapter::KEY_Z)
- {
- if (!g_ZoomMT)
- return false;
- osg::Matrix transMatrix = g_ZoomMT->getMatrix();
- transMatrix.setTrans(transMatrix.getTrans() + osg::Vec3(0, 0, 0.1));
- g_ZoomMT->setMatrix(transMatrix);
- }
- }
- default: break;
- }
- return false;
- }
- };
- //
- //
- class ViewerWidget : public QWidget, public osgViewer::Viewer
- {
- public:
- ViewerWidget(osg::Node *scene = NULL)
- {
- QWidget* renderWidget = getRenderWidget( createGraphicsWindow(0,0,640,480), scene);
- QVBoxLayout* layout = new QVBoxLayout;
- layout->addWidget(renderWidget);
- layout->setContentsMargins(0, 0, 0, 1);
- setLayout( layout );
- connect( &_timer, SIGNAL(timeout()), this, SLOT(update()) );
- _timer.start( 10 );
- }
- QWidget* getRenderWidget( osgQt::GraphicsWindowQt* gw, osg::Node* scene )
- {
- osg::Camera* camera = this->getCamera();
- camera->setGraphicsContext( gw );
- const osg::GraphicsContext::Traits* traits = gw->getTraits();
- camera->setClearColor( osg::Vec4(0.2f, 0.5f, 1.0f, 1.0f) );
- camera->setViewport( new osg::Viewport(0, 0, traits->width, traits->height) );
- camera->setProjectionMatrixAsPerspective(45.0f, static_cast<double>(traits->width)/static_cast<double>(traits->height), 0.1f, 100.0f );
- camera->setViewMatrixAsLookAt(osg::Vec3d(0, 0, 1), osg::Vec3d(0, 0, 0), osg::Vec3d(0, 1, 0));
- unsigned int clearMask = camera->getClearMask();
- camera->setClearMask(clearMask | GL_STENCIL_BUFFER_BIT);
- this->setSceneData( scene );
- this->addEventHandler(new ManipulatorSceneHandler);
- return gw->getGLWidget();
- }
- osgQt::GraphicsWindowQt* createGraphicsWindow( int x, int y, int w, int h, const std::string& name="", bool windowDecoration=false )
- {
- osg::DisplaySettings* ds = osg::DisplaySettings::instance().get();
- osg::ref_ptr<osg::GraphicsContext::Traits> traits = new osg::GraphicsContext::Traits;
- traits->windowName = name;
- traits->windowDecoration = windowDecoration;
- traits->x = x;
- traits->y = y;
- traits->width = w;
- traits->height = h;
- traits->doubleBuffer = true;
- traits->alpha = ds->getMinimumNumAlphaBits();
- traits->stencil = ds->getMinimumNumStencilBits();
- traits->sampleBuffers = ds->getMultiSamples();
- traits->samples = ds->getNumMultiSamples();
- return new osgQt::GraphicsWindowQt(traits.get());
- }
- virtual void paintEvent( QPaintEvent* event )
- {
- frame();
- }
- protected:
- QTimer _timer;
- };
- osg::Node* buildScene()
- {
- osg::Group *root = new osg::Group;
- osg::Light *light = new osg::Light;
- light->setAmbient(osg::Vec4(LightAmb[0], LightAmb[1], LightAmb[2], LightAmb[3]));
- light->setDiffuse(osg::Vec4(LightDif[0], LightDif[1], LightDif[2], LightDif[3]));
- light->setPosition(osg::Vec4(LightPos[0], LightPos[1], LightPos[2], LightPos[3]));
- light->setLightNum(0);
- osg::LightSource *lightSource = new osg::LightSource;
- lightSource->setLight(light);
- osg::MatrixTransform *tiltMT = new osg::MatrixTransform;
- g_ZoomMT = tiltMT;
- tiltMT->setMatrix(osg::Matrix::translate(0.0f, -0.6f, -7.0f));
- tiltMT->addChild(lightSource);
- //创建模板缓冲区中的镜面(不可见)
- //深度测试关闭意味着深度测试总是通过
- osg::Geode *stencilFloorGeode = createFloor();
- osg::Stencil *floorStencil = new osg::Stencil;
- floorStencil->setFunction(osg::Stencil::ALWAYS, 1, 1);
- floorStencil->setOperation(osg::Stencil::KEEP, osg::Stencil::KEEP, osg::Stencil::REPLACE);
- osg::ColorMask *colorMask1 = new osg::ColorMask(0, 0, 0, 0);
- stencilFloorGeode->getOrCreateStateSet()->setMode(GL_DEPTH_TEST, false);
- stencilFloorGeode->getOrCreateStateSet()->setAttribute(colorMask1, osg::StateAttribute::ON);
- stencilFloorGeode->getOrCreateStateSet()->setAttributeAndModes(floorStencil);
- stencilFloorGeode->getOrCreateStateSet()->setMode(GL_LIGHTING, false);
- //创建镜面中的球体(球体镜像)
- osg::MatrixTransform *reflectScaleMT = new osg::MatrixTransform;
- reflectScaleMT->setMatrix(osg::Matrix::scale(1.0, -1.0, 1.0));
- reflectScaleMT->addChild(lightSource);
- osg::MatrixTransform *reflectTransMT = new osg::MatrixTransform;
- reflectTransMT->setMatrix(osg::Matrix::translate(0.0, 2.0, 0.0));
- g_ReflectTrans = reflectTransMT;
- osg::MatrixTransform *reflectRotateX = new osg::MatrixTransform;
- g_ReflectRotX = reflectRotateX;
- reflectRotateX->addUpdateCallback(new RotAxisCallback(osg::X_AXIS));
- osg::MatrixTransform *reflectRotateY = new osg::MatrixTransform;
- g_ReflectRotY = reflectRotateY;
- reflectRotateY->addUpdateCallback(new RotAxisCallback(osg::Y_AXIS));
- osg::Group *reflectionBall = createSphere();
- osg::Stencil *stencilBall = new osg::Stencil;
- stencilBall->setFunction(osg::Stencil::EQUAL, 1, 1);
- stencilBall->setOperation(osg::Stencil::KEEP, osg::Stencil::KEEP, osg::Stencil::KEEP);
- osg::ClipPlane *clipPlane = new osg::ClipPlane(0, 0.0, -1.0, 0.0, 0.0);
- reflectionBall->getOrCreateStateSet()->setAttributeAndModes(stencilBall, osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE);
- reflectionBall->getOrCreateStateSet()->setAttributeAndModes(clipPlane);
- reflectScaleMT->addChild(reflectTransMT);
- reflectTransMT->addChild(reflectRotateX);
- reflectRotateX->addChild(reflectRotateY);
- reflectRotateY->addChild(reflectionBall);
- //创建颜色缓冲区镜面(可见)
- osg::Geode *colorBufferFloor = createFloor();
- osg::BlendFunc *blendFunc = new osg::BlendFunc(osg::BlendFunc::SRC_ALPHA, osg::BlendFunc::ONE_MINUS_SRC_ALPHA);
- osg::Geometry *floorGeometry = colorBufferFloor->getDrawable(0)->asGeometry();
- if (floorGeometry)
- {
- osg::Vec4Array *colorArray = new osg::Vec4Array;
- colorArray->push_back(osg::Vec4(1.0f, 1.0f, 1.0f, 0.8f));
- floorGeometry->setColorArray(colorArray, osg::Array::BIND_OVERALL);
- floorGeometry->getOrCreateStateSet()->setAttributeAndModes(blendFunc);
- floorGeometry->getOrCreateStateSet()->setMode(GL_LIGHTING, osg::StateAttribute::OFF);
- }
- osg::MatrixTransform *transMT = new osg::MatrixTransform;
- transMT->setMatrix(osg::Matrix::translate(0, 2, 0));
- g_Trans = transMT;
- osg::MatrixTransform *rotateX = new osg::MatrixTransform;
- g_RotX = rotateX;
- rotateX->addUpdateCallback(new RotAxisCallback(osg::X_AXIS));
- osg::MatrixTransform *rotateY = new osg::MatrixTransform;
- g_RotY = rotateY;
- rotateY->addUpdateCallback(new RotAxisCallback(osg::Y_AXIS));
- osg::Group *realBall = createSphere();
- transMT->addChild(rotateX);
- rotateX->addChild(rotateY);
- rotateY->addChild(realBall);
- //所有部分添加到场景节点
- root->addChild(tiltMT);
- tiltMT->addChild(stencilFloorGeode);
- tiltMT->addChild(reflectScaleMT);
- tiltMT->addChild(colorBufferFloor);
- tiltMT->addChild(transMT);
- return root;
- }
- int main( int argc, char** argv )
- {
- QApplication app(argc, argv);
- ViewerWidget* viewWidget = new ViewerWidget(buildScene());
- viewWidget->setGeometry( 100, 100, 640, 480 );
- viewWidget->show();
- return app.exec();
- }
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