Fifth Demo of OGRE---Listener-优快云博客

本文介绍了一个使用Ogre游戏引擎创建3D场景的应用实例。通过创建实体、设置光源、控制相机节点和响应用户输入来实现基本的场景交互。文章详细展示了如何通过编程控制角色移动和视角变化。

#include "ExampleApplication.h" class TutorialFrameListener : public ExampleFrameListener { public: TutorialFrameListener(RenderWindow* win, Camera* cam, SceneManager *sceneMgr) : ExampleFrameListener(win, cam, false, false) { mMouseDown = false; mToggle = 0.0; // Populate the camera and scene manager containers mCamNode = cam->getParentSceneNode(); mSceneMgr = sceneMgr; mRotate = 0.13; mMove = 250; } bool frameStarted(const FrameEvent &evt) { mMouse->capture(); mKeyboard->capture(); if(mKeyboard->isKeyDown(OIS::KC_ESCAPE)) { return false; } bool currMouse = mMouse->getMouseState().buttonDown(OIS::MB_Left); if (currMouse && ! mMouseDown) { Light *light = mSceneMgr->getLight("Light1"); light->setVisible(! light->isVisible()); } // if mMouseDown = currMouse; mToggle -= evt.timeSinceLastFrame; if ((mToggle < 0.0f ) && mKeyboard->isKeyDown(OIS::KC_1)) { mToggle = 0.5f; mCamera->getParentSceneNode()->detachObject(mCamera); mCamNode = mSceneMgr->getSceneNode("CamNode1"); mCamNode->attachObject(mCamera); } else if ((mToggle < 0.0f) && mKeyboard->isKeyDown(OIS::KC_2)) { mToggle = 0.5f; mCamera->getParentSceneNode()->detachObject(mCamera); mCamNode = mSceneMgr->getSceneNode("CamNode2"); mCamNode->attachObject(mCamera); } Vector3 transVector = Vector3::ZERO; if (mKeyboard->isKeyDown(OIS::KC_UP) || mKeyboard->isKeyDown(OIS::KC_W)) { transVector.z -= mMove; } if (mKeyboard->isKeyDown(OIS::KC_DOWN) || mKeyboard->isKeyDown(OIS::KC_S)) { transVector.z += mMove; } if (mKeyboard->isKeyDown(OIS::KC_LEFT) || mKeyboard->isKeyDown(OIS::KC_A)) { transVector.x -= mMove; } if (mKeyboard->isKeyDown(OIS::KC_RIGHT) || mKeyboard->isKeyDown(OIS::KC_D)) { transVector.x += mMove; } if (mKeyboard->isKeyDown(OIS::KC_PGUP) || mKeyboard->isKeyDown(OIS::KC_Q)) { transVector.y += mMove; } if (mKeyboard->isKeyDown(OIS::KC_PGDOWN) || mKeyboard->isKeyDown(OIS::KC_E)) { transVector.y -= mMove; } mCamNode->translate(transVector*evt.timeSinceLastFrame,Node::TS_LOCAL); if (mMouse->getMouseState().buttonDown(OIS::MB_Right)) { mCamNode->yaw(Degree(-mRotate * mMouse->getMouseState().X.rel), Node::TS_WORLD); mCamNode->pitch(Degree(-mRotate * mMouse->getMouseState().Y.rel), Node::TS_LOCAL); } return true; // return ExampleFrameListener::frameStarted(evt); } protected: bool mMouseDown; // Whether or not the left mouse button was down last frame Real mToggle; // The time left until next toggle Real mRotate; // The rotate constant Real mMove; // The movement constant SceneManager *mSceneMgr; // The current SceneManager SceneNode *mCamNode; // The SceneNode the camera is currently attached to }; class FameApplication : public ExampleApplication { public: FameApplication(); ~FameApplication(); //Just override the mandatory create scene method void createScene(void); void createFrameListener(void); void createCamera(void); void destroyScene(void); }; FameApplication::FameApplication() { } FameApplication::~FameApplication() { } void FameApplication::createScene() { //set ambient light mSceneMgr->setAmbientLight(ColourValue(0.25, 0.25, 0.25)); //create a entiry Entity* pEntity = mSceneMgr->createEntity("Ninja", "ninja.mesh"); //create a sence node SceneNode* pSceneNode = mSceneMgr->getRootSceneNode()->createChildSceneNode("NinjaNode"); pSceneNode->attachObject(pEntity); Light *light = mSceneMgr->createLight("Light1"); light->setType(Light::LT_POINT); light->setPosition(Vector3(250, 150, 250)); light->setDiffuseColour(ColourValue::White); light->setSpecularColour(ColourValue::White); // Create the scene node pSceneNode = mSceneMgr->getRootSceneNode()->createChildSceneNode("CamNode1", Vector3(-400, 200, 400)); pSceneNode->yaw(Degree(-45)); pSceneNode->attachObject(mCamera); // create the second camera node pSceneNode = mSceneMgr->getRootSceneNode()->createChildSceneNode("CamNode2", Vector3(0, 200, 400)); } void FameApplication::createFrameListener(void) { // Create the FrameListener mFrameListener = new TutorialFrameListener(mWindow, mCamera, mSceneMgr); mRoot->addFrameListener(mFrameListener); // Show the frame stats overlay mFrameListener->showDebugOverlay(true); } void FameApplication::createCamera(void) { // create camera, but leave at default position mCamera = mSceneMgr->createCamera("PlayerCam"); mCamera->setNearClipDistance(5); } void FameApplication::destroyScene() { } INT WINAPI WinMain( HINSTANCE hInst, HINSTANCE, LPSTR strCmdLine, INT ) { // Create application object FameApplication app; try { app.go(); } catch( Ogre::Exception& e ) { MessageBox( NULL, e.getFullDescription().c_str(), "An exception has occured!", MB_OK | MB_ICONERROR | MB_TASKMODAL); } return 0; }