菜鸟也学Ogre-地形天空雾

OGRE中的Terrain,sky和fog
1．  为了处理Terrain场景，首先要选择相应类型的SceneManager，这里选择了“ST_EXTERIOR_CLOSE”类型。这个操作是通过Root::createSceneManager()完成的。此操作创建并返回了一个TerrainSceneManager指针，同时创建了一个HeightmapTerrainPageSource对象。
2．  加载地形是通过：mSceneMgr->setWorldGeometry( "terrain.cfg" );语句来完成的。
3．  天空是通过SceneManager::setSkyBox()等函数完成的；
4．  Fog是通过SceneManager::setFog()完成。
主要的几个函数
void TutorialApplication::destroyScene(void)
{
    OGRE_DELETE mTerrainGroup;
    OGRE_DELETE mTerrainGlobals;
}
void getTerrainImage(bool flipX,bool flipY,Ogre::Image& img)
{
    img.load("terrain.png", Ogre::ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME);
    if (flipX)
        img.flipAroundY();
    if (flipY)
        img.flipAroundX();
}


void TutorialApplication::initBlendMaps(Ogre::Terrain *terrain)
{
    Ogre::TerrainLayerBlendMap* blendMap0 = terrain->getLayerBlendMap(1);
    Ogre::TerrainLayerBlendMap* blendMap1 = terrain->getLayerBlendMap(2);
    Ogre::Real minHeight0 = 70;
    Ogre::Real fadeDist0 = 40;
    Ogre::Real minHeight1 = 70;
    Ogre::Real fadeDist1 = 15;
    float* pBlend0 = blendMap0->getBlendPointer();
    float* pBlend1 = blendMap1->getBlendPointer();
    for (Ogre::uint16 y = 0; y < terrain->getLayerBlendMapSize(); ++y)
    {
        for (Ogre::uint16 x = 0; x < terrain->getLayerBlendMapSize(); ++x)
        {
            Ogre::Real tx, ty;


            blendMap0->convertImageToTerrainSpace(x, y, &tx, &ty);
            Ogre::Real height = terrain->getHeightAtTerrainPosition(tx, ty);
            Ogre::Real val = (height - minHeight0) / fadeDist0;
            val = Ogre::Math::Clamp(val, (Ogre::Real)0, (Ogre::Real)1);
            *pBlend0++ = val;


            val = (height - minHeight1) / fadeDist1;
            val = Ogre::Math::Clamp(val, (Ogre::Real)0, (Ogre::Real)1);
            *pBlend1++ = val;
        }
    }
    blendMap0->dirty();
    blendMap1->dirty();
    blendMap0->update();
    blendMap1->update();
}


//-------------------------------------------------------------------------------------
void TutorialApplication::createScene(void)
{


    //创建雾
   Ogre::ColourValue fadeColour(0.9, 0.9, 0.9);
mSceneMgr->setFog(Ogre::FOG_LINEAR, fadeColour, 0.0, 10, 1200);
   mWindow->getViewport(0)->setBackgroundColour(fadeColour);
    //设置摄像机
    mCamera->setPosition(Ogre::Vector3(1683, 50, 2116));
    mCamera->lookAt(Ogre::Vector3(1963, 50, 1660));
    mCamera->setNearClipDistance(0.1);
    mCamera->setFarClipDistance(50000);


    if (mRoot->getRenderSystem()->getCapabilities()->hasCapability(Ogre::RSC_INFINITE_FAR_PLANE))
    {
        mCamera->setFarClipDistance(0);   // enable infinite far clip distance if we can
    }
    //设置灯光
    Ogre::Vector3 lightdir(0.55, -0.3, 0.75);
    lightdir.normalise();
    //mSceneMgr->setAmbientLight(Ogre::ColourValue(0.1, 0, 0));
    Ogre::Light* light = mSceneMgr->createLight("tstLight");
    light->setType(Ogre::Light::LT_DIRECTIONAL);
    light->setDirection(lightdir);
    light->setDiffuseColour(Ogre::ColourValue::White);
    light->setSpecularColour(Ogre::ColourValue(0.4, 0.4, 0.4));


    mSceneMgr->setAmbientLight(Ogre::ColourValue(0.2, 0.2, 0.2));
    mTerrainGlobals= OGRE_NEW Ogre::TerrainGlobalOptions();


    mTerrainGroup = OGRE_NEW Ogre::TerrainGroup(mSceneMgr, Ogre::Terrain::ALIGN_X_Z, 513, 12000.0f);
    mTerrainGroup->setFilenameConvention(Ogre::String("BasicTutorial3Terrain"), Ogre::String("dat"));
    mTerrainGroup->setOrigin(Ogre::Vector3::ZERO);


    configureTerrainDefaults(light);


    for (long x = 0; x <= 0; ++x)
        for (long y = 0; y <= 0; ++y)
            defineTerrain(x, y);


    // sync load since we want everything in place when we start
    mTerrainGroup->loadAllTerrains(true);


    if (mTerrainsImported)
    {
        Ogre::TerrainGroup::TerrainIterator ti = mTerrainGroup->getTerrainIterator();
        while(ti.hasMoreElements())
        {
            Ogre::Terrain* t = ti.getNext()->instance;
            initBlendMaps(t);
        }


//创建天空
        Ogre::Plane plane;
        plane.d = 100;
        plane.normal = Ogre::Vector3::NEGATIVE_UNIT_Y;
        mSceneMgr->setSkyPlane(true, plane, "Examples/CloudySky", 500, 20, true, 0.5, 150, 150);
    }


    mTerrainGroup->freeTemporaryResources();
}
void TutorialApplication::createFrameListener(void)
{
    BaseApplication::createFrameListener();
    mInfoLabel = mTrayMgr->createLabel(OgreBites::TL_TOP, "TInfo", "", 350);


}
void TutorialApplication::configureTerrainDefaults(Ogre::Light *light)
{
    // Configure global
    mTerrainGlobals->setMaxPixelError(8);
    // testing composite map
    mTerrainGlobals->setCompositeMapDistance(3000);


    // Important to set these so that the terrain knows what to use for derived (non-realtime) data
    mTerrainGlobals->setLightMapDirection(light->getDerivedDirection());
    mTerrainGlobals->setCompositeMapAmbient(mSceneMgr->getAmbientLight());
    mTerrainGlobals->setCompositeMapDiffuse(light->getDiffuseColour());


    // Configure default import settings for if we use imported image
    Ogre::Terrain::ImportData& defaultimp = mTerrainGroup->getDefaultImportSettings();
    defaultimp.terrainSize = 513;
    defaultimp.worldSize = 12000.0f;
    defaultimp.inputScale = 600;
    defaultimp.minBatchSize = 33;
    defaultimp.maxBatchSize = 65;
    // textures
    defaultimp.layerList.resize(3);
    defaultimp.layerList[0].worldSize = 100;
    defaultimp.layerList[0].textureNames.push_back("dirt_grayrocky_diffusespecular.dds");
    defaultimp.layerList[0].textureNames.push_back("dirt_grayrocky_normalheight.dds");
    defaultimp.layerList[1].worldSize = 30;
    defaultimp.layerList[1].textureNames.push_back("grass_green-01_diffusespecular.dds");
    defaultimp.layerList[1].textureNames.push_back("grass_green-01_normalheight.dds");
    defaultimp.layerList[2].worldSize = 200;
    defaultimp.layerList[2].textureNames.push_back("growth_weirdfungus-03_diffusespecular.dds");
    defaultimp.layerList[2].textureNames.push_back("growth_weirdfungus-03_normalheight.dds");
}
void TutorialApplication::defineTerrain(long x, long y)
{
    Ogre::String filename = mTerrainGroup->generateFilename(x, y);
    if (Ogre::ResourceGroupManager::getSingleton().resourceExists(mTerrainGroup->getResourceGroup(), filename))
    {
        mTerrainGroup->defineTerrain(x, y);
    }
    else
    {
        Ogre::Image img;
        getTerrainImage(x % 2 != 0, y % 2 != 0, img);
        mTerrainGroup->defineTerrain(x, y, &img);
        mTerrainsImported = true;
    }
}
bool TutorialApplication::frameRenderingQueued(const Ogre::FrameEvent &evt)
{
    bool ret = BaseApplication::frameRenderingQueued(evt);


       if (mTerrainGroup->isDerivedDataUpdateInProgress())
       {
           mTrayMgr->moveWidgetToTray(mInfoLabel, OgreBites::TL_TOP, 0);
           mInfoLabel->show();
           if (mTerrainsImported)
           {
               mInfoLabel->setCaption("Building terrain, please wait...");
           }
           else
           {
               mInfoLabel->setCaption("Updating textures, patience...");
           }
       }
       else
       {
           mTrayMgr->removeWidgetFromTray(mInfoLabel);
           mInfoLabel->hide();
           if (mTerrainsImported)
           {
               mTerrainGroup->saveAllTerrains(true);
               mTerrainsImported = false;
           }
       }


       return ret;

}

最终效果：

2012-7-15