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