osg入门系列7- 一个小房子

#include <iostream>

#include <osg/Texture2D>

#include <osg/Geometry>

#include <osg/Geode>

#include <osgDB/ReadFile>

#include <osgUtil/SmoothingVisitor>

#include <osgViewer/Viewer>

using namespace std;

osg::Drawable* createHouseWall()

{

    osg::ref_ptr<osg::Vec3Array> vertices = new osg::Vec3Array();

    vertices->push_back(osg::Vec3(0.0, 0.0, 4.0)); //0

    vertices->push_back(osg::Vec3(0.0, 0.0, 0.0)); //1

    vertices->push_back(osg::Vec3(6.0, 0.0, 4.0)); //2

    vertices->push_back(osg::Vec3(6.0, 0.0, 0.0)); //3

    vertices->push_back(osg::Vec3(6.0, 4.0, 4.0)); //4

    vertices->push_back(osg::Vec3(6.0, 4.0, 0.0)); //5

    vertices->push_back(osg::Vec3(0.0, 4.0, 4.0)); //6

    vertices->push_back(osg::Vec3(0.0, 4.0, 0.0)); //7

    vertices->push_back(osg::Vec3(0.0, 0.0, 4.0)); //8

    vertices->push_back(osg::Vec3(0.0, 0.0, 0.0)); //9

    osg::ref_ptr<osg::Vec3Array> normals = new osg::Vec3Array(10);

    (*normals)[0].set(-0.707, -0.707, 0.0);

    (*normals)[1].set(-0.707, -0.707, 0.0);

    (*normals)[2].set(0.707, -0.707, 0.0);

    (*normals)[3].set(0.707, -0.707, 0.0);

    (*normals)[4].set(0.707, 0.707, 0.0);

    (*normals)[5].set(0.707, 0.707, 0.0);

    (*normals)[6].set(-0.707, 0.707, 0.0);

    (*normals)[7].set(-0.707, 0.707, 0.0);

    (*normals)[8].set(-0.707, -0.707, 0.0);

    (*normals)[9].set(-0.707, -0.707, 0.0);

    osg::ref_ptr<osg::Vec2Array> texcoords = new osg::Vec2Array(10);

    (*texcoords)[0].set(0.0, 1.0);

    (*texcoords)[1].set(0.0, 0.0);

    (*texcoords)[2].set(0.3, 1.0);

    (*texcoords)[3].set(0.3, 0.0);

    (*texcoords)[4].set(0.5, 1.0);

    (*texcoords)[5].set(0.5, 0.0);

    (*texcoords)[6].set(0.8, 1.0);

    (*texcoords)[7].set(0.8, 0.0);

    (*texcoords)[8].set(1.0, 1.0);

    (*texcoords)[9].set(1.0, 0.0);

    osg::ref_ptr<osg::Geometry> houseWall = new osg::Geometry;

    houseWall->setVertexArray(vertices.get());

    houseWall->setTexCoordArray(0, texcoords.get());

    houseWall->setNormalArray(normals.get());

    houseWall->setNormalBinding(osg::Geometry::BIND_PER_VERTEX);

    houseWall->addPrimitiveSet(new osg::DrawArrays(osg::DrawArrays::QUAD_STRIP, 0, 10));

    houseWall->getOrCreateStateSet()->setTextureAttributeAndModes(0,

                                                                  new osg::Texture2D(osgDB::readImageFile("wall.png")));

    return houseWall.release();

}

osg::Drawable* createHouseRoof()

{

    osg::ref_ptr<osg::Vec3Array> vertices = new osg::Vec3Array;

    vertices->push_back(osg::Vec3(-0.2, -0.5, 3.5));

    vertices->push_back(osg::Vec3(6.2, -0.5, 3.5));

    vertices->push_back(osg::Vec3(0.8, 2.0, 6.0));

    vertices->push_back(osg::Vec3(5.2, 2.0, 6.0));

    vertices->push_back(osg::Vec3(-0.2, 4.5, 3.5));

    vertices->push_back(osg::Vec3(6.2, 4.5, 3.5));

    osg::ref_ptr<osg::DrawArrays> roof =

            new osg::DrawArrays(osg::DrawArrays::QUAD_STRIP, 0, 6);

     osg::ref_ptr<osg::DrawElementsUInt> roofSide =

             new osg::DrawElementsUInt(osg::DrawElementsUInt::TRIANGLES, 6);

     (*roofSide)[0] = 0;

     (*roofSide)[1] = 2;

     (*roofSide)[2] = 4;

     (*roofSide)[3] = 5;

     (*roofSide)[4] = 3;

     (*roofSide)[5] = 1;

     osg::ref_ptr<osg::Vec4Array> colors = new osg::Vec4Array;

     colors->push_back(osg::Vec4(0.25, 0.0, 0.0, 1.0));

     osg::ref_ptr<osg::Geometry> houseRoof = new osg::Geometry;

     houseRoof->setVertexArray(vertices.get());

     houseRoof->setColorArray(colors.get());

     houseRoof->setColorBinding(osg::Geometry::BIND_OVERALL);

     houseRoof->addPrimitiveSet(roof.get());

     houseRoof->addPrimitiveSet(roofSide.get());

     osgUtil::SmoothingVisitor smv;

     smv.smooth(*houseRoof);

     return houseRoof.release();

}

int main()

{

    osg::ref_ptr<osg::Geode> geode = new osg::Geode;

    geode->addDrawable(createHouseWall());

    geode->addDrawable(createHouseRoof());

    osgViewer::Viewer viewer;

    viewer.setSceneData(geode.get());

    return viewer.run();

    return 0;

}

----

TEMPLATE = app

CONFIG += console

CONFIG -= qt

SOURCES += main.cpp

LIBS += -L/usr/local/lib/

LIBS += -lOpenThreads

LIBS += -losg

LIBS += -losgDB

LIBS += -losgFX

LIBS += -losgGA

LIBS += -losgManipulator

LIBS += -losgParticle

LIBS += -losgShadow

LIBS += -losgSim

LIBS += -losgTerrain

LIBS += -losgText

LIBS += -losgUtil

LIBS += -losgViewer

---