第三章 OGRE中的光照，阴影，摄像机和视口

#include "ExampleApplication.h"class Example3:public ExampleApplication{public:void createScene(){/*//1 beginOgre::Plane plane(Vector3::UNIT_Y,-10);Ogre::MeshManager::getSingleton().createPlane("plane",ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME,plane,1500,1500,20,20,true,1,5,5,Vector3::UNIT_Z);Ogre::Entity* ent=mSceneMgr->createEntity("LightPlaneEntity","plane");mSceneMgr->getRootSceneNode()->createChildSceneNode()->attachObject(ent);ent->setMaterialName("Examples/BeachStones");//1 end//2_1 beginOgre::SceneNode* node1=mSceneMgr->createSceneNode("Node1");mSceneMgr->getRootSceneNode()->addChild(node1);Ogre::Light* light1=mSceneMgr->createLight("MyLight1");light1->setType(Ogre::Light::LT_POINT);light1->setPosition(0,20,0);light1->setDiffuseColour(1.0f,1.0f,1.0f);Ogre::Entity* LightEnt1=mSceneMgr->createEntity("MyEntity1","sphere.mesh");Ogre::SceneNode* node2=node1->createChildSceneNode("Node2");node2->setPosition(0,20,0);node2->setScale(0.1f,0.1f,0.1f);node2->attachObject(LightEnt1);//2_1 end//3_2 beginOgre::Light *light2=mSceneMgr->createLight("MyLight2");light2->setType(Ogre::Light::LT_POINT);light2->setPosition(20,20,20);light2->setDiffuseColour(1.0f,1.0f,1.0f);Ogre::Entity* LightEnt2=mSceneMgr->createEntity("MyEntity2","sphere.mesh");Ogre::SceneNode* node3=node1->createChildSceneNode("Node3");node3->setPosition(20,20,20);node3->setScale(0.1f,0.1f,0.1f);node3->attachObject(LightEnt2);//3_2 end*///4|all beginOgre::Plane plane(Vector3::UNIT_Y,-10);Ogre::MeshManager::getSingleton().createPlane("plane",ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME,plane,1500,1500,200,200,true,1,5,5,Vector3::UNIT_Z);Ogre::Entity* ent=mSceneMgr->createEntity("LightPlaneEntity","plane");mSceneMgr->getRootSceneNode()->createChildSceneNode()->attachObject(ent);ent->setMaterialName("Examples/BeachStones");Ogre::SceneNode* node1=mSceneMgr->createSceneNode("Node1");mSceneMgr->getRootSceneNode()->addChild(node1);Ogre::SceneNode* node4=node1->createChildSceneNode("Node4");node4->setPosition(0,100,0);Ogre::Light* pSpotLight1=mSceneMgr->createLight("MySpotLight1");pSpotLight1->setType(Ogre::Light::LT_SPOTLIGHT);pSpotLight1->setDirection(Ogre::Vector3(1,-1,0));pSpotLight1->setSpotlightInnerAngle(Ogre::Degree(5.0f));pSpotLight1->setSpotlightOuterAngle(Ogre::Degree(45.0f));pSpotLight1->setSpotlightFalloff(0.0f);pSpotLight1->setDiffuseColour(Ogre::ColourValue(0.0f,1.0f,0.0f));node4->attachObject(pSpotLight1);//如果不显示附着，则是在RootSceneNode()上附着Ogre::Entity* GreenSpotLightSphere=mSceneMgr->createEntity("GreenSpotLightSphere","sphere.mesh");node4->setScale(0.1f,0.1f,0.1f);node4->attachObject(GreenSpotLightSphere);Ogre::SceneNode* redspotlightnode=node1->createChildSceneNode("RedSpotLightNode");Ogre::Light* redspotlight=mSceneMgr->createLight("RedSpotLight");redspotlight->setType(Ogre::Light::LT_SPOTLIGHT);redspotlight->setDiffuseColour(Ogre::ColourValue(1.0f,0.0f,0.0f));redspotlight->setDirection(-1,-1,0);redspotlight->setSpotlightInnerAngle(Ogre::Degree(5.0f));redspotlight->setSpotlightOuterAngle(Ogre::Degree(45.0f));redspotlight->setSpotlightFalloff(0.0f);redspotlightnode->attachObject(redspotlight);Ogre::Entity* redspotlightsphere=mSceneMgr->createEntity("RedSpotLightSphere","sphere.mesh");redspotlightnode->setScale(0.1f,0.1f,0.1f);redspotlightnode->setPosition(200,100,0);//注意是结点位移，不是灯光位移，否则球体不位移redspotlightnode->attachObject(redspotlightsphere);//4|all end//5_4 beginOgre::Light* directionallight=mSceneMgr->createLight("DirectionLight");directionallight->setType(Ogre::Light::LT_DIRECTIONAL);directionallight->setDirection(1,-1,0);//方向光源无需attachdirectionallight->setDiffuseColour(Ogre::ColourValue(1.0f,1.0f,1.0f));//5_4 end//6_5 beginOgre::Entity* Sinbad=mSceneMgr->createEntity("Sinbad","Sinbad.mesh");Ogre::SceneNode* SinbadNode=mSceneMgr->getRootSceneNode()->createChildSceneNode("SinbadNode");SinbadNode->setPosition(Ogre::Vector3(0.0f,4.0f,0.0f));//平面在-10,-10+14(Sinbad放大3倍后下半身长度为14)=4SinbadNode->setScale(3.0f,3.0f,3.0f);SinbadNode->attachObject(Sinbad);//6_5 end//7_6 beginmSceneMgr->setShadowTechnique(Ogre::SHADOWTYPE_STENCIL_ADDITIVE);//7_6 end}//8_7 beginvoid createCamera(){mCamera=mSceneMgr->createCamera("MyCamera1");mCamera->setPosition(0,100,200);mCamera->lookAt(0,0,0);mCamera->setNearClipDistance(5);//8.1 begin//mCamera->setPolygonMode(Ogre::PM_WIREFRAME);//8.1 end}//8_7 end//9_8|8.1 beginvoid createViewports(){Ogre::Viewport* vp=mWindow->addViewport(mCamera);vp->setBackgroundColour(Ogre::ColourValue(0.0f,0.0f,1.0f));//9.1 begin//mCamera->setAspectRatio(Real(vp->getActualWidth())/Real(vp->getActualHeight()));//9.1 end//10_9|9.1 beginmCamera->setAspectRatio(0.2);//10_9|9.1 end}//9_8|8.1 end};int main(){Example3 app;app.go();return 0;}

 --->mSceneMgr ----->  mCamera

mRoot   

--->mWindow ----------> addViewport(mCamera)

There can only be one camera active at a particular time 

Each viewport can only render the view of one camera,so Ogre 3D enforces that one camera is given during creation.Of course,the camera can be changed later using the appropriate getter and setter functions.