OSG/TextureCubeMap 立方贴图天空盒示例

原来实例带的图片不清楚，换做了opengl入门里面的图片：

#include <osgViewer/Viewer>#include <osg/Vec3>
#include <osg/Vec4>
#include <osg/Quat>
#include <osg/Matrix>
#include <osg/ShapeDrawable>
#include <osg/Geometry>
#include <osg/Geode>
#include <osg/Transform>
#include <osg/Material>
#include <osg/NodeCallback>
#include <osg/Depth>
#include <osg/CullFace>
#include <osg/TexMat>
#include <osg/TexGen>
#include <osg/TexEnv>
#include <osg/TextureCubeMap>#include <osgDB/WriteFile>
#include <osgDB/ReadFile>#include <osgUtil/Optimizer>#include <iostream>#pragma comment(lib, "OpenThreadsd.lib")
#pragma comment(lib, "osgd.lib")
#pragma comment(lib, "osgDBd.lib")
#pragma comment(lib, "osgUtild.lib")
#pragma comment(lib, "osgGAd.lib")
#pragma comment(lib, "osgViewerd.lib")
#pragma comment(lib, "osgTextd.lib")//读取立方图
osg::ref_ptr<osg::TextureCubeMap> readCubeMap()
{osg::ref_ptr<osg::TextureCubeMap> cubemap = new osg::TextureCubeMap;osg::ref_ptr<osg::Image> imagePosX = osgDB::readImageFile("right.jpg");osg::ref_ptr<osg::Image> imageNegX = osgDB::readImageFile("left.jpg");osg::ref_ptr<osg::Image> imagePosY = osgDB::readImageFile("down.jpg");osg::ref_ptr<osg::Image> imageNegY = osgDB::readImageFile("up.jpg");osg::ref_ptr<osg::Image> imagePosZ = osgDB::readImageFile("front.jpg");osg::ref_ptr<osg::Image> imageNegZ = osgDB::readImageFile("back.jpg");if (imagePosX.get() && imageNegX.get() && imagePosY.get() && imageNegY.get() && imagePosZ.get() && imageNegZ.get()){//设置立方图的六个面的贴图cubemap->setImage(osg::TextureCubeMap::POSITIVE_X, imagePosX.get());cubemap->setImage(osg::TextureCubeMap::NEGATIVE_X, imageNegX.get());cubemap->setImage(osg::TextureCubeMap::POSITIVE_Y, imagePosY.get());cubemap->setImage(osg::TextureCubeMap::NEGATIVE_Y, imageNegY.get());cubemap->setImage(osg::TextureCubeMap::POSITIVE_Z, imagePosZ.get());cubemap->setImage(osg::TextureCubeMap::NEGATIVE_Z, imageNegZ.get());//设置纹理环绕模式cubemap->setWrap(osg::Texture::WRAP_S, osg::Texture::CLAMP_TO_EDGE);cubemap->setWrap(osg::Texture::WRAP_T, osg::Texture::CLAMP_TO_EDGE);cubemap->setWrap(osg::Texture::WRAP_R, osg::Texture::CLAMP_TO_EDGE);//设置滤波：线形和mipmapcubemap->setFilter(osg::Texture::MIN_FILTER, osg::Texture::LINEAR_MIPMAP_LINEAR);cubemap->setFilter(osg::Texture::MAG_FILTER, osg::Texture::LINEAR);}return cubemap.get();
}//更新立方体图纹理
struct TexMatCallback : public osg::NodeCallback
{public:TexMatCallback(osg::TexMat& tm) :_texMat(tm){//}virtual void operator()(osg::Node* node, osg::NodeVisitor* nv){osgUtil::CullVisitor* cv = dynamic_cast<osgUtil::CullVisitor*>(nv);if (cv){//得到模型视图矩阵并设置旋转角度const osg::Matrix& MV = *(cv->getModelViewMatrix());const osg::Matrix R = osg::Matrix::rotate( osg::DegreesToRadians(112.0f), 0.0f,0.0f,1.0f)*osg::Matrix::rotate( osg::DegreesToRadians(90.0f), 1.0f,0.0f,0.0f);osg::Quat q = MV.getRotate();const osg::Matrix C = osg::Matrix::rotate( q.inverse() );//设置纹理矩阵_texMat.setMatrix( C*R );}traverse(node,nv);}//纹理矩阵osg::TexMat& _texMat;
};//一个变换类，使天空盒绕视点旋转
class MoveEarthySkyWithEyePointTransform : public osg::Transform
{public://局部矩阵计算成世界矩阵virtual bool computeLocalToWorldMatrix(osg::Matrix& matrix,osg::NodeVisitor* nv) const {osgUtil::CullVisitor* cv = dynamic_cast<osgUtil::CullVisitor*>(nv);if (cv){osg::Vec3 eyePointLocal = cv->getEyeLocal();matrix.preMult(osg::Matrix::translate(eyePointLocal));}return true;}//世界矩阵计算为局部矩阵virtual bool computeWorldToLocalMatrix(osg::Matrix& matrix,osg::NodeVisitor* nv) const{osgUtil::CullVisitor* cv = dynamic_cast<osgUtil::CullVisitor*>(nv);if (cv){osg::Vec3 eyePointLocal = cv->getEyeLocal();matrix.postMult(osg::Matrix::translate(-eyePointLocal));}return true;}
};//创建天空盒
osg::ref_ptr<osg::Node> createSkyBox()
{osg::ref_ptr<osg::StateSet> stateset = new osg::StateSet();//设置纹理映射方式，指定为替代方式，即纹理中的颜色代替原来的颜色osg::ref_ptr<osg::TexEnv> te = new osg::TexEnv;te->setMode(osg::TexEnv::REPLACE);stateset->setTextureAttributeAndModes(0, te.get(), osg::StateAttribute::ON| osg::StateAttribute::OVERRIDE);//自动生成纹理坐标，反射方式(REFLECTION_MAP)/*NORMAL_MAP　标准模式－立方图纹理REFLECTION_MAP　反射模式－球体纹理SPHERE_MAP　球体模型－球体纹理*/osg::ref_ptr<osg::TexGen> tg = new osg::TexGen;tg->setMode(osg::TexGen::NORMAL_MAP);stateset->setTextureAttributeAndModes(0, tg.get(), osg::StateAttribute::ON| osg::StateAttribute::OVERRIDE);//设置纹理矩阵osg::ref_ptr<osg::TexMat> tm = new osg::TexMat;stateset->setTextureAttribute(0, tm.get());//设置立方图纹理osg::ref_ptr<osg::TextureCubeMap> skymap = readCubeMap();stateset->setTextureAttributeAndModes(0, skymap.get(), osg::StateAttribute::ON| osg::StateAttribute::OVERRIDE);stateset->setMode( GL_LIGHTING, osg::StateAttribute::OFF );stateset->setMode( GL_CULL_FACE, osg::StateAttribute::OFF );//将深度设置为远平面osg::ref_ptr<osg::Depth> depth = new osg::Depth;depth->setFunction(osg::Depth::ALWAYS);depth->setRange(1.0,1.0);//远平面   stateset->setAttributeAndModes(depth, osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE);//设置渲染顺序为-1，先渲染stateset->setRenderBinDetails(-1,"RenderBin");osg::ref_ptr<osg::Drawable> drawable = new osg::ShapeDrawable(new osg::Sphere(osg::Vec3(0.0f,0.0f,0.0f),1));//把球体加入到叶节点osg::ref_ptr<osg::Geode> geode = new osg::Geode;geode->setCullingActive(false);geode->setStateSet( stateset.get());geode->addDrawable(drawable.get());//设置变换osg::ref_ptr<osg::Transform> transform = new MoveEarthySkyWithEyePointTransform();transform->setCullingActive(false);transform->addChild(geode.get());osg::ref_ptr<osg::ClearNode> clearNode = new osg::ClearNode;clearNode->setCullCallback(new TexMatCallback(*tm));clearNode->addChild(transform.get());return clearNode.get();
}int main()
{osg::ref_ptr<osgViewer::Viewer> viewer= new osgViewer::Viewer();osg::ref_ptr<osg::Group> rootnode = new osg::Group();//加入天空盒rootnode->addChild(createSkyBox());// 加入模型rootnode->addChild(osgDB::readNodeFile("cow.osg"));//优化场景数据osgUtil::Optimizer optimzer;optimzer.optimize(rootnode.get());viewer->setSceneData(rootnode.get());viewer->addEventHandler(new osgGA::StateSetManipulator(viewer->getCamera()->getOrCreateStateSet()));viewer->addEventHandler(new osgViewer::StatsHandler());//实现状态信息统计viewer->addEventHandler(new osgViewer::WindowSizeHandler());viewer->realize();viewer->run();return 0 ;
}

效果如下图所示：

OSG/TextureCubeMap 立方贴图天空盒示例相关推荐

OpenGL 立方体贴图Cubemaps
OpenGL立方体贴图Cubemaps 立方体贴图Cubemaps简介创建立方体贴图天空盒加载天空盒显示天空盒优化环境映射反射折射动态环境贴图立方体贴图Cubemaps简介我们已 ...
LearnOpenGL 高级OpenGL—立方体贴图
文章目录写在前面立方体贴图创建立方体贴图天空盒加载天空盒显示天空盒优化环境映射反射折射动态环境贴图总结写在前面原文链接.原文应该是github上的一个项目,本文主要用来记录 ...
OpenGL ES 3. 天空盒立方体贴图
大家好,接下来将为大家介绍OpenGL ES 3. 天空盒立方体贴图. OpenGL ES 立方体贴图本质上还是纹理映射,是一种 3D 纹理映射.立方体贴图所使的纹理称为立方图纹理,它是由 6 个单 ...
第十八课，立方体贴图（加载天空盒）
原理我在这里不再过多叙述,主要从代码的运行方向来解读立方体贴图添加天空盒顶点 float skyboxVertices[] = {// positions -1.0f, 1.0f, -1.0f,-1 ...
UnityShader18.1：立方体贴图（下）
接上文:https://blog.csdn.net/Jaihk662/article/details/113248074 四.菲涅尔反射菲涅尔反射(Fresnel Reflection)就是同时考虑 ...
UnityShader18：立方体贴图（上）
一.天空盒使用立方体贴图最直接的目的就是展现天空盒,或者更进一步用于实现环境映射(反射与折射) 关于立方体贴图的采样原理:https://blog.csdn.net/Jaihk662/article ...
LearnOpenGL-＞立方体贴图
立方体贴图立方体贴图在本节中,我们将讨论的是将多个纹理组合起来映射到一张纹理上的一种纹理类型:立方体贴图(Cube Map). 简单来说,立方体贴图就是一个包含了6个2D纹理的纹理,每个2D纹理都 ...
OpenGL 核心技术之立方体贴图
笔者介绍:姜雪伟,IT公司技术合伙人,IT高级讲师,CSDN社区专家,特邀编辑,畅销书作者,国家专利发明人;已出版书籍:<手把手教你架构3D游戏引擎>电子工业出版社和<Unity3D ...
OpenGL 入门 17：立方体贴图
立方体贴图(Cube Map) 立方体贴图是由"上下左右前后"6个2D纹理合并成的一张纹理.与2D纹理使用(u,v)坐标采样不同的是,立方体纹理使用一个方向向量进行采样. 1. 方 ...
QT之OpenG立方体贴图
QT之OpenGL立方体贴图 1. 概述 2. 绘制天空盒 2.1 demo 3. 环境映射 3.1 反射 3.1.1 demo 3.1.2 3.2 折射 3.2.1 demo 4. 反射纹理 4.1 ...

OSG/TextureCubeMap 立方贴图天空盒示例

OSG/TextureCubeMap 立方贴图天空盒示例相关推荐

最新文章

热门文章