OGER SDK研究之四 Demo_SkyBox 天空盒

 SkyBox.h

/*
-----------------------------------------------------------------------------
This source file is part of OGRE
    (Object-oriented Graphics Rendering Engine)
For the latest info, see http://www.ogre3d.org/

Copyright (c) 2000-2006 Torus Knot Software Ltd
Also see acknowledgements in Readme.html

You may use this sample code for anything you like, it is not covered by the
LGPL like the rest of the engine.

-----------------------------------------------------------------------------
*/

/**
    /file
        SkyBox.h  天空盒
    /brief
        Specialisation of OGRE's framework application to show the
        skybox feature where a wrap-around environment is projected
        onto a cube around the camera.
  //加入一个天空盒
*/

#include "ExampleApplication.h"

ParticleSystem *pThrusters;  //粒子系统

class SkyBoxFrameListener : public ExampleFrameListener
{
private:
    static float fDefDim;
    static float fDefVel;

public:
    SkyBoxFrameListener(RenderWindow* win, Camera* cam) : ExampleFrameListener( win, cam )
    {
    }
 //每一帧开始前的处理
    bool frameStarted( const FrameEvent& evt )
    {
        if( ExampleFrameListener::frameStarted( evt ) == false )
  return false;

        if( mKeyboard->isKeyDown( OIS::KC_N ) )
        {
   //如果按键N 设置粒子系统的尺寸增大
            pThrusters->setDefaultDimensions( fDefDim + 0.25, fDefDim + 0.25 );
            fDefDim += 0.25;
        }

        if( mKeyboard->isKeyDown( OIS::KC_M ) )
        {
   //如果按键M 设置粒子系统的尺寸减小
            pThrusters->setDefaultDimensions( fDefDim - 0.25, fDefDim - 0.25 );
            fDefDim -= 0.25;
        }

        if( mKeyboard->isKeyDown( OIS::KC_H ) )
        {
   //如果按键H 设置粒子系统的速度增加
            pThrusters->getEmitter( 0 )->setParticleVelocity( fDefVel + 1 );
            pThrusters->getEmitter( 1 )->setParticleVelocity( fDefVel + 1 );
            fDefVel += 1;           
        }

        if( mKeyboard->isKeyDown( OIS::KC_J ) && !( fDefVel < 0.0f ) )
        {
   //如果按键J 设置粒子系统的速度减缓
            pThrusters->getEmitter( 0 )->setParticleVelocity( fDefVel - 1 );
            pThrusters->getEmitter( 1 )->setParticleVelocity( fDefVel - 1 );
            fDefVel -= 1;           
        }

        return true;
    }
};

float SkyBoxFrameListener::fDefDim = 25.0f;
float SkyBoxFrameListener::fDefVel = 50.0f;

class SkyBoxApplication : public ExampleApplication
{
public:
    SkyBoxApplication() {}

protected:
    virtual void createFrameListener(void)
    {
  //创建自定义帧监听器并连接
        mFrameListener= new SkyBoxFrameListener(mWindow, mCamera);
        mRoot->addFrameListener(mFrameListener);
    }

    // Just override the mandatory create scene method
 // 创建场景
    void createScene(void)
    {
        // Set ambient light
  // 设置环境光
        mSceneMgr->setAmbientLight(ColourValue(0.5, 0.5, 0.5));

        // Create a skybox
  // 设置天空盒
        mSceneMgr->setSkyBox(true, "Examples/SpaceSkyBox", 50 );

        // Create a light
  // 创建一个灯光
        Light* l = mSceneMgr->createLight("MainLight");
        // Accept default settings: point light, white diffuse, just set position
        // NB I could attach the light to a SceneNode if I wanted it to move automatically with
        //  other objects, but I don't
  //设置自创建灯光的位置
        l->setPosition(20,80,50);

        // Also add a nice starship in
  // 由模型文件创建一个实体
        Entity *ent = mSceneMgr->createEntity( "razor", "razor.mesh" );

  //将实体加入到主场景中
        mSceneMgr->getRootSceneNode()->attachObject( ent );

  //创建一个粒子系统
        pThrusters = mSceneMgr->createParticleSystem( "ParticleSys1", 200 );

  //设置粒子系统的材质
        pThrusters ->setMaterialName( "Examples/Flare" );
  //设置粒子的大小
        pThrusters ->setDefaultDimensions( 25, 25 );

  //创建两个点粒子发射器
        ParticleEmitter *pEmit1 = pThrusters ->addEmitter( "Point" );
        ParticleEmitter *pEmit2 = pThrusters ->addEmitter( "Point" );

        // Thruster 1
  //第一发射器参数设置（角度，生命时长，衰减速率，运动速度，方向，色彩）
        pEmit1->setAngle( Degree(3) );
        pEmit1->setTimeToLive( 0.2 );
        pEmit1->setEmissionRate( 70 );
  
        pEmit1->setParticleVelocity( 50 );

        pEmit1->setDirection(- Vector3::UNIT_Z);
        pEmit1->setColour( ColourValue::White, ColourValue::Red);       

        // Thruster 2
  //第二发射器参数设置（角度，生命时长，衰减速率，运动速度，方向，色彩）
        pEmit2->setAngle( Degree(3) );
        pEmit2->setTimeToLive( 0.2 );
        pEmit2->setEmissionRate( 70 );

        pEmit2->setParticleVelocity( 50 );

        pEmit2->setDirection( -Vector3::UNIT_Z );
        pEmit2->setColour( ColourValue::White, ColourValue::Red );

        // Set the position of the thrusters
  //设置发射器的位置
        pEmit1->setPosition( Vector3( 5.7f, 0.0f, 0.0f ) );
        pEmit2->setPosition( Vector3( -18.0f, 0.0f, 0.0f ) );

  //将粒子系统加入到场景中
        mSceneMgr->getRootSceneNode()->createChildSceneNode( Vector3( 0.0f, 6.5f, -67.0f ) )
            ->attachObject(pThrusters);
    }

};

 

SkyBox.cpp:

/*
-----------------------------------------------------------------------------
This source file is part of OGRE
    (Object-oriented Graphics Rendering Engine)
For the latest info, see http://www.ogre3d.org/

Copyright (c) 2000-2006 Torus Knot Software Ltd
Also see acknowledgements in Readme.html

You may use this sample code for anything you like, it is not covered by the
LGPL like the rest of the engine.
-----------------------------------------------------------------------------
*/

/**
    /file
        SkyBox.cpp
    /brief
        Shows OGRE's skybox feature where a wrap-around environment is projected
        onto a cube around the camera.
*/

#include "SkyBox.h"

#if OGRE_PLATFORM == OGRE_PLATFORM_WIN32
#define WIN32_LEAN_AND_MEAN
#include "windows.h"
#endif

#ifdef __cplusplus
extern "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
    SkyBoxApplication 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