第二章 Cameras, Lights, and Shadows

由于第二章写出的时候还没有把wizzard搞出来，所以这个项目是手动生成，估计后面我都会用WIZZARD来生成

#include "BaseTutorial2.h"BasicTutorial2::BasicTutorial2(void){}BasicTutorial2::~BasicTutorial2(void){}void BasicTutorial2::createCamera(void){mCamera=mSceneMgr->createCamera("PlayerCam");//you can use getCamera retrieves a pointer to the named camera.mCamera->setPosition(Ogre::Vector3(0,10,500));mCamera->lookAt(Ogre::Vector3(0,0,0));mCamera->setNearClipDistance(5);//though you should not use a far clip distance with Stencil ShadowsmCameraMan=new OgreBites::SdkCameraMan(mCamera);//The Ogre Wiki Tutorial Framework uses OgreBites for GUI widgets and camera handling. //It uses it because OgreBites - the Ogre sample framework - is included in every Ogre SDK, and because it simplifies things a lot.}void BasicTutorial2::createViewports(void){Ogre::Viewport* vp=mWindow->addViewport(mCamera);vp->setBackgroundColour(Ogre::ColourValue(0,0,0));mCamera->setAspectRatio(Ogre::Real(vp->getActualWidth())/Ogre::Real(vp->getActualHeight()));}void BasicTutorial2::createScene(void){mSceneMgr->setAmbientLight(Ogre::ColourValue(0,0,0));mSceneMgr->setShadowTechnique(Ogre::SHADOWTYPE_STENCIL_ADDITIVE);//Ogre currently supports three types of Shadows://1.Modulative Texture Shadows (Ogre::SHADOWTYPE_TEXTURE_MODULATIVE) - The least computationally expensive of //the three. This creates a black and white render-to-texture of shadow casters, which is then applied to the scene.//2.Modulative Stencil Shadows (Ogre::SHADOWTYPE_STENCIL_MODULATIVE) - This technique renders all shadow volumes as//a modulation after all non-transparent objects have been rendered to the scene. This is not as intensive as //Additive Stencil Shadows, but it is also not as accurate.//3.Additive Stencil Shadows (Ogre::SHADOWTYPE_STENCIL_ADDITIVE) - This technique renders each light as a separate //additive pass on the scene. This is very hard on the graphics card because each additional light requires an //additional pass at rendering the scene.//Ogre does not support soft shadows as part of the engine. If you want soft shadows you will need to write your own vertex and fragment programs. Ogre::Entity* entNinja=mSceneMgr->createEntity("Ninja","ninja.mesh");entNinja->setCastShadows(true);mSceneMgr->getRootSceneNode()->createChildSceneNode()->attachObject(entNinja);Ogre::Plane plane(Ogre::Vector3::UNIT_Y,0);Ogre::MeshManager::getSingleton().createPlane("ground",Ogre::ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME,plane,\1500,1500,20,20,true,1,5,5,Ogre::Vector3::UNIT_Z);Ogre::Entity* entGround = mSceneMgr->createEntity("GroundEntity","ground");mSceneMgr->getRootSceneNode()->createChildSceneNode()->attachObject(entGround);entGround->setMaterialName("Examples/Rockwall");entGround->setCastShadows(false);//Now that we have a Ninja and ground in the scene, let's compile and run the program. //We see... nothing! What's going on? In the previous tutorial we added entities and they displayed fine. //The reason the Ninja doesn't show up is that the scene's ambient light has been set to total darkness. //So let's add a light to see what is going on.Ogre::Light* pointLight = mSceneMgr->createLight("pointLight");pointLight->setType(Ogre::Light::LT_POINT);pointLight->setPosition(Ogre::Vector3(0,150,250));pointLight->setDiffuseColour(1.0f,0.0f,0.0f);pointLight->setSpecularColour(1.0f,0.0f,0.0f);Ogre::Light* directionalLight=mSceneMgr->createLight("directionalLight");directionalLight->setType(Ogre::Light::LT_DIRECTIONAL);directionalLight->setDiffuseColour(Ogre::ColourValue(.25f,.25f,0));directionalLight->setSpecularColour(Ogre::ColourValue(.25f,.25f,0));directionalLight->setDirection(Ogre::Vector3( 0,-1,1));Ogre::Light* spotLight=mSceneMgr->createLight("spotLight");spotLight->setType(Ogre::Light::LT_SPOTLIGHT);spotLight->setDiffuseColour(0,0,1.0f);spotLight->setSpecularColour(0,0,1.0f);spotLight->setDirection(-1,-1,0);spotLight->setPosition(Ogre::Vector3(300,300,0));spotLight->setSpotlightRange(Ogre::Degree(35),Ogre::Degree(35));}//2 end#if OGRE_PLATFORM == OGRE_PLATFORM_WIN32#define WIN32_LEAN_AND_MEAN#include "windows.h"#endif#ifdef __cplusplusextern "C" {#endif#if OGRE_PLATFORM == OGRE_PLATFORM_WIN32    INT WINAPI WinMain( HINSTANCE hInst, HINSTANCE, LPSTR strCmdLine, INT )#else    int main(int argc, char *argv[])#endif    {        // Create application object        BasicTutorial2 app;        try {            app.go();        } catch( Ogre::Exception& e ) {#if OGRE_PLATFORM == OGRE_PLATFORM_WIN32            MessageBox( NULL, e.getFullDescription().c_str(), "An exception has occured!", MB_OK | MB_ICONERROR | MB_TASKMODAL);#else            std::cerr << "An exception has occured: " <<                e.getFullDescription().c_str() << std::endl;#endif        }        return 0;    }#ifdef __cplusplus}#endif

三种不同的阴影效果：