Osg-海军osg教程源代码之金子塔的绘制

相关资料：

实例代码：

.pro

QT       += core gui widgets
TARGET = TestOsgQt
TEMPLATE = app
DEFINES += QT_DEPRECATED_WARNINGS
CONFIG += c++11

SOURCES += 
        main.cpp 
        widget.cpp

HEADERS += 
        widget.h

OsgDir = D:\RuanJian\osg365R
CONFIG(release, debug|release) {
    LIBS += -L$${OsgDir}/lib/ -losgQOpenGL -losgDB -losgViewer -losg -losgUtil -losgGA
} else {
    LIBS += -L$${OsgDir}/lib/ -losgQOpenGLd -losgDBd -losgViewerd -losgd -losgUtild -losgGAd
}

INCLUDEPATH += $${OsgDir}/include
DEPENDPATH += $${OsgDir}/include

main.cpp

#include "widget.h"
#include <QApplication>

#include <osg/Node>
#include <osg/Group>
#include <osg/Geode>
#include <osg/Geometry>
#include <osg/Texture2D>
#include <osg/StateSet>
#include <osg/PositionAttitudeTransform>
#include <osgViewer/Viewer>
#include <osgDB/ReadFile>
//#include <osg/Ref_ptr>

int main(int argc, char *argv[])
{
    osg::Group* root = new osg::Group();
   osg::Geode* pyramidGeode = new osg::Geode();
   osg::Geometry* pyramidGeometry = new osg::Geometry();
   pyramidGeode->addDrawable(pyramidGeometry);
   root->addChild(pyramidGeode);
    osg::Vec3Array* pyramidVertices = new osg::Vec3Array;
   pyramidVertices->push_back( osg::Vec3( 0, 0, 0) ); // 左前
   pyramidVertices->push_back( osg::Vec3(10, 0, 0) ); // 右前
   pyramidVertices->push_back( osg::Vec3(10,10, 0) ); // 右后
   pyramidVertices->push_back( osg::Vec3( 0,10, 0) ); // 左后
   pyramidVertices->push_back( osg::Vec3( 5, 5,10) ); // 塔尖
   pyramidGeometry->setVertexArray( pyramidVertices );
   osg::DrawElementsUInt* pyramidBase =
      new osg::DrawElementsUInt(osg::PrimitiveSet::QUADS, 0);
   pyramidBase->push_back(3);
   pyramidBase->push_back(2);
   pyramidBase->push_back(1);
   pyramidBase->push_back(0);
   pyramidGeometry->addPrimitiveSet(pyramidBase);
//重复这一过程，添加金字塔的每个面。再次注意，顶点是以逆时针为顺序添加的。
   osg::DrawElementsUInt* pyramidFaceOne = new osg::DrawElementsUInt(osg::PrimitiveSet::TRIANGLES, 0);
   pyramidFaceOne->push_back(0);
   pyramidFaceOne->push_back(1);
   pyramidFaceOne->push_back(4);
   pyramidGeometry->addPrimitiveSet(pyramidFaceOne);

   osg::DrawElementsUInt* pyramidFaceTwo =
      new osg::DrawElementsUInt(osg::PrimitiveSet::TRIANGLES, 0);
   pyramidFaceTwo->push_back(1);
   pyramidFaceTwo->push_back(2);
   pyramidFaceTwo->push_back(4);
   pyramidGeometry->addPrimitiveSet(pyramidFaceTwo);

   osg::DrawElementsUInt* pyramidFaceThree = new osg::DrawElementsUInt(osg::PrimitiveSet::TRIANGLES, 0);
   pyramidFaceThree->push_back(2);
   pyramidFaceThree->push_back(3);
   pyramidFaceThree->push_back(4);
   pyramidGeometry->addPrimitiveSet(pyramidFaceThree);

   osg::DrawElementsUInt* pyramidFaceFour =
      new osg::DrawElementsUInt(osg::PrimitiveSet::TRIANGLES, 0);
   pyramidFaceFour->push_back(3);
   pyramidFaceFour->push_back(0);
   pyramidFaceFour->push_back(4);
   pyramidGeometry->addPrimitiveSet(pyramidFaceFour);
//定义一个Vec4的数组，用于保存颜色值。
   osg::Vec4Array* colors = new osg::Vec4Array;
   colors->push_back(osg::Vec4(1.0f, 0.0f, 0.0f, 1.0f) ); //索引0 红色
   colors->push_back(osg::Vec4(0.0f, 1.0f, 0.0f, 1.0f) ); //索引1 绿色
   colors->push_back(osg::Vec4(0.0f, 0.0f, 1.0f, 1.0f) ); //索引2 蓝色
   colors->push_back(osg::Vec4(1.0f, 1.0f, 1.0f, 1.0f) ); //索引3 白色
   osg::TemplateIndexArray
      <unsigned int, osg::Array::UIntArrayType,4,4> *colorIndexArray;
   colorIndexArray =
      new osg::TemplateIndexArray<unsigned int, osg::Array::UIntArrayType,4,4>;
   colorIndexArray->push_back(0); // vertex 0 assigned color array element 0
   colorIndexArray->push_back(1); // vertex 1 assigned color array element 1
   colorIndexArray->push_back(2); // vertex 2 assigned color array element 2
   colorIndexArray->push_back(3); // vertex 3 assigned color array element 3
   colorIndexArray->push_back(0); // vertex 4 assigned color array element 0
   pyramidGeometry->setColorArray(colors);
//   pyramidGeometry->setColorIndices(colorIndexArray);
   pyramidGeometry->setColorBinding(osg::Geometry::BIND_PER_VERTEX);

   osg::Vec2Array* texcoords = new osg::Vec2Array(5);
   (*texcoords)[0].set(0.00f,0.0f);
   (*texcoords)[1].set(0.25f,0.0f);
   (*texcoords)[2].set(0.50f,0.0f);
   (*texcoords)[3].set(0.75f,0.0f);
   (*texcoords)[4].set(0.50f,1.0f);
    pyramidGeometry->setTexCoordArray(0,texcoords);
//初始化位置变换节点
   osg::PositionAttitudeTransform* pyramidTwoXForm =new osg::PositionAttitudeTransform();

//使用osg::Group的addChild方法，将位置变换节点添加到根节点的子节点上，并将金字塔节点作为变换节点的子节点
   root->addChild(pyramidTwoXForm);
   pyramidTwoXForm->addChild(pyramidGeode);

// 初始化一个Vec3实例，用于改变模型在场景中的位置
   osg::Vec3 pyramidTwoPosition(15,0,0);
   pyramidTwoXForm->setPosition( pyramidTwoPosition );
//最后，设置视窗类并进入仿真循环。
   osgViewer::Viewer viewer;

   viewer.setSceneData( root );

  return viewer.run();
}