SPK::SPK_ID createExplosion( const SparkDrawable::TextureIDMap& textureIDMap, int screenWidth, int screenHeight )
{
    SparkDrawable::TextureIDMap::const_iterator itr;
    GET_TEXTURE_ID( "explosion", textureExplosion );
    GET_TEXTURE_ID( "flash", textureFlash );
    GET_TEXTURE_ID( "spark1", textureSpark1 );
    GET_TEXTURE_ID( "spark2", textureSpark2 );
    GET_TEXTURE_ID( "wave", textureWave );
    
    //
    // Renderers
    //
    
    // smoke renderer
    SPK::GL::GLQuadRenderer* smokeRenderer = SPK::GL::GLQuadRenderer::create();
    smokeRenderer->setTexturingMode(SPK::TEXTURE_2D);
    smokeRenderer->setTexture(textureExplosion);
    smokeRenderer->setTextureBlending(GL_MODULATE);
    smokeRenderer->setAtlasDimensions(2,2); // uses 4 different patterns in the texture
    smokeRenderer->setBlending(SPK::BLENDING_ALPHA);
    smokeRenderer->enableRenderingHint(SPK::DEPTH_WRITE,false);
    smokeRenderer->setShared(true);

    // flame renderer
    SPK::GL::GLQuadRenderer* flameRenderer = SPK::GL::GLQuadRenderer::create();
    flameRenderer->setTexturingMode(SPK::TEXTURE_2D);
    flameRenderer->setTexture(textureExplosion);
    flameRenderer->setTextureBlending(GL_MODULATE);
    flameRenderer->setAtlasDimensions(2,2);
    flameRenderer->setBlending(SPK::BLENDING_ADD);
    flameRenderer->enableRenderingHint(SPK::DEPTH_WRITE,false);
    flameRenderer->setShared(true);

    // flash renderer
    SPK::GL::GLQuadRenderer* flashRenderer = SPK::GL::GLQuadRenderer::create();
    flashRenderer->setTexturingMode(SPK::TEXTURE_2D);
    flashRenderer->setTexture(textureFlash);
    flashRenderer->setTextureBlending(GL_REPLACE);
    flashRenderer->setBlending(SPK::BLENDING_ADD);
    flashRenderer->enableRenderingHint(SPK::DEPTH_WRITE,false);
    flashRenderer->setShared(true);

    // spark 1 renderer
    SPK::GL::GLQuadRenderer* spark1Renderer = SPK::GL::GLQuadRenderer::create();
    spark1Renderer->setTexturingMode(SPK::TEXTURE_2D);
    spark1Renderer->setTexture(textureSpark1);
    spark1Renderer->setTextureBlending(GL_REPLACE);
    spark1Renderer->setBlending(SPK::BLENDING_ADD);
    spark1Renderer->enableRenderingHint(SPK::DEPTH_WRITE,false);
    spark1Renderer->setOrientation(SPK::DIRECTION_ALIGNED); // sparks are oriented function o their velocity
    spark1Renderer->setScale(0.05f,1.0f); // thin rectangles
    spark1Renderer->setShared(true);

    // spark 2 renderer
    SPK::GL::GLRenderer* spark2Renderer = NULL;
    if ( SPK::GL::GLPointRenderer::loadGLExtPointSprite() &&
         SPK::GL::GLPointRenderer::loadGLExtPointParameter()) // uses point sprite if possible
    {
        SPK::GL::GLPointRenderer::setPixelPerUnit(45.0f * osg::PI / 180.0f, screenHeight);
        SPK::GL::GLPointRenderer* pointRenderer = SPK::GL::GLPointRenderer::create();
        pointRenderer->setType(SPK::POINT_SPRITE);
        pointRenderer->setTexture(textureSpark2);
        pointRenderer->setTextureBlending(GL_MODULATE);
        pointRenderer->enableWorldSize(true);
        pointRenderer->setSize(0.02f);
        spark2Renderer = pointRenderer;
    }
    else
    {
        SPK::GL::GLQuadRenderer* quadRenderer = SPK::GL::GLQuadRenderer::create();
        quadRenderer->setTexturingMode(SPK::TEXTURE_2D);
        quadRenderer->setTexture(textureSpark2);
        quadRenderer->setTextureBlending(GL_MODULATE);
        quadRenderer->setScale(0.02f,0.02f);
        spark2Renderer = quadRenderer;
    }
    spark2Renderer->setBlending(SPK::BLENDING_ADD);
    spark2Renderer->enableRenderingHint(SPK::DEPTH_WRITE,false);
    spark2Renderer->setShared(true);

    // wave renderer
    SPK::GL::GLQuadRenderer* waveRenderer = SPK::GL::GLQuadRenderer::create();
    waveRenderer->setTexturingMode(SPK::TEXTURE_2D);
    waveRenderer->setTexture(textureWave);
    waveRenderer->setTextureBlending(GL_MODULATE);
    waveRenderer->setBlending(SPK::BLENDING_ALPHA);
    waveRenderer->enableRenderingHint(SPK::DEPTH_WRITE,false);
    waveRenderer->enableRenderingHint(SPK::ALPHA_TEST,true); // uses the alpha test
    waveRenderer->setAlphaTestThreshold(0.0f);
    waveRenderer->setOrientation(SPK::FIXED_ORIENTATION); // the orientatin is fixed
    waveRenderer->lookVector.set(0.0f,1.0f,0.0f);
    waveRenderer->upVector.set(1.0f,0.0f,0.0f); // we dont really care about the up axis
    waveRenderer->setShared(true);
    
    //
    // Models
    //
    SPK::Interpolator* interpolator = NULL; // pointer to an interpolator that is used to retrieve interpolators    

    // smoke model
    SPK::Model* smokeModel = SPK::Model::create(
        SPK::FLAG_RED | SPK::FLAG_GREEN | SPK::FLAG_BLUE | SPK::FLAG_ALPHA |
        SPK::FLAG_SIZE | SPK::FLAG_ANGLE | SPK::FLAG_TEXTURE_INDEX,
        SPK::FLAG_SIZE | SPK::FLAG_ANGLE,
        SPK::FLAG_SIZE | SPK::FLAG_ANGLE | SPK::FLAG_TEXTURE_INDEX,
        SPK::FLAG_ALPHA);
    smokeModel->setParam(SPK::PARAM_RED,0.2f);
    smokeModel->setParam(SPK::PARAM_GREEN,0.2f);
    smokeModel->setParam(SPK::PARAM_BLUE,0.2f);
    smokeModel->setParam(SPK::PARAM_SIZE,0.6f,0.8f,1.0f,1.4f);
    smokeModel->setParam(SPK::PARAM_TEXTURE_INDEX,0.0f,4.0f);
    smokeModel->setParam(SPK::PARAM_ANGLE,0.0f,osg::PI * 0.5f,0.0f,osg::PI * 0.5f);
    smokeModel->setLifeTime(2.5f,3.0f);
    smokeModel->setShared(true);

    interpolator = smokeModel->getInterpolator(SPK::PARAM_ALPHA);
    interpolator->addEntry(0.0f,0.0f);
    interpolator->addEntry(0.4f,0.4f,0.6f);
    interpolator->addEntry(0.6f,0.4f,0.6f);
    interpolator->addEntry(1.0f,0.0f);

    // flame model
    SPK::Model* flameModel = SPK::Model::create(
        SPK::FLAG_RED | SPK::FLAG_GREEN | SPK::FLAG_BLUE | SPK::FLAG_ALPHA |
        SPK::FLAG_SIZE | SPK::FLAG_ANGLE | SPK::FLAG_TEXTURE_INDEX,
        SPK::FLAG_ANGLE | SPK::FLAG_RED | SPK::FLAG_GREEN | SPK::FLAG_BLUE,
        SPK::FLAG_ANGLE | SPK::FLAG_TEXTURE_INDEX,
        SPK::FLAG_SIZE | SPK::FLAG_ALPHA);
    flameModel->setParam(SPK::PARAM_RED,1.0f,0.2f);
    flameModel->setParam(SPK::PARAM_GREEN,0.5f,0.2f);
    flameModel->setParam(SPK::PARAM_BLUE,0.2f,0.2f);
    flameModel->setParam(SPK::PARAM_TEXTURE_INDEX,0.0f,4.0f);
    flameModel->setParam(SPK::PARAM_ANGLE,0.0f,osg::PI * 0.5f,0.0f,osg::PI * 0.5f);
    flameModel->setLifeTime(1.5f,2.0f);
    flameModel->setShared(true);

    interpolator = flameModel->getInterpolator(SPK::PARAM_SIZE);
    interpolator->addEntry(0.0f,0.25f);
    interpolator->addEntry(0.02f,0.6f,0.8f);
    interpolator->addEntry(1.0f,1.0f,1.4f);

    interpolator = flameModel->getInterpolator(SPK::PARAM_ALPHA);
    interpolator->addEntry(0.5f,1.0f);
    interpolator->addEntry(1.0f,0.0f);

    // flash model
    SPK::Model* flashModel = SPK::Model::create(
        SPK::FLAG_ALPHA | SPK::FLAG_SIZE | SPK::FLAG_ANGLE,
        SPK::FLAG_NONE,
        SPK::FLAG_ANGLE,
        SPK::FLAG_ALPHA | SPK::FLAG_SIZE);
    flashModel->setParam(SPK::PARAM_ANGLE,0.0f,2.0f * osg::PI);
    flashModel->setLifeTime(0.5f,0.5f);
    flashModel->setShared(true);

    interpolator = flashModel->getInterpolator(SPK::PARAM_SIZE);
    interpolator->addEntry(0.0f,0.25f);
    interpolator->addEntry(0.1f,1.0f,2.0f);

    interpolator = flashModel->getInterpolator(SPK::PARAM_ALPHA);
    interpolator->addEntry(0.0f,1.0f);
    interpolator->addEntry(0.4f,0.0f);

    // spark 1 model
    SPK::Model* spark1Model = SPK::Model::create(
        SPK::FLAG_SIZE | SPK::FLAG_ALPHA,
        SPK::FLAG_ALPHA,
        SPK::FLAG_SIZE);
    spark1Model->setParam(SPK::PARAM_ALPHA,1.0f,0.0f);
    spark1Model->setParam(SPK::PARAM_SIZE,0.2f,0.4f);
    spark1Model->setLifeTime(0.2f,1.0f);
    spark1Model->setShared(true);

    // spark 2 model
    SPK::Model* spark2Model = SPK::Model::create(
        SPK::FLAG_RED | SPK::FLAG_GREEN | SPK::FLAG_BLUE | SPK::FLAG_ALPHA,
        SPK::FLAG_GREEN | SPK::FLAG_BLUE | SPK::FLAG_ALPHA,
        SPK::FLAG_GREEN);
    spark2Model->setParam(SPK::PARAM_ALPHA,1.0f,0.0f);
    spark2Model->setParam(SPK::PARAM_RED,1.0f);
    spark2Model->setParam(SPK::PARAM_GREEN,1.0f,1.0f,0.3f,1.0f);
    spark2Model->setParam(SPK::PARAM_BLUE,0.7f,0.3f);
    spark2Model->setLifeTime(1.0f,3.0f);
    spark2Model->setShared(true);

    // wave model
    SPK::Model* waveModel = SPK::Model::create(
        SPK::FLAG_ALPHA | SPK::FLAG_SIZE,
        SPK::FLAG_SIZE | SPK::FLAG_ALPHA);
    waveModel->setParam(SPK::PARAM_SIZE,0.0f,4.0f);
    waveModel->setParam(SPK::PARAM_ALPHA,0.2f,0.0f);
    waveModel->setLifeTime(0.8f,0.8f);
    waveModel->setShared(true);
    
    //
    // Emitters
    //
    SPK::Sphere* explosionSphere = SPK::Sphere::create(SPK::Vector3D(0.0f,0.0f,0.0f),0.4f);

    // smoke emitter
    SPK::RandomEmitter* smokeEmitter = SPK::RandomEmitter::create();
    smokeEmitter->setZone(SPK::Sphere::create(SPK::Vector3D(0.0f,0.0f,0.0f),0.6f),false);
    smokeEmitter->setFlow(-1);
    smokeEmitter->setTank(15);
    smokeEmitter->setForce(0.02f,0.04f);

    // flame emitter
    SPK::NormalEmitter* flameEmitter = SPK::NormalEmitter::create();
    flameEmitter->setZone(explosionSphere);
    flameEmitter->setFlow(-1);
    flameEmitter->setTank(15);
    flameEmitter->setForce(0.06f,0.1f);

    // flash emitter
    SPK::StaticEmitter* flashEmitter = SPK::StaticEmitter::create();
    flashEmitter->setZone(SPK::Sphere::create(SPK::Vector3D(0.0f,0.0f,0.0f),0.1f));
    flashEmitter->setFlow(-1);
    flashEmitter->setTank(3);

    // spark 1 emitter
    SPK::NormalEmitter* spark1Emitter = SPK::NormalEmitter::create();
    spark1Emitter->setZone(explosionSphere);
    spark1Emitter->setFlow(-1);
    spark1Emitter->setTank(20);
    spark1Emitter->setForce(2.0f,3.0f);

    // spark 2 emitter
    SPK::NormalEmitter* spark2Emitter = SPK::NormalEmitter::create();
    spark2Emitter->setZone(explosionSphere);
    spark2Emitter->setFlow(-1);
    spark2Emitter->setTank(400);
    spark2Emitter->setForce(0.4f,0.8f);

    // wave emitter
    SPK::StaticEmitter* waveEmitter = SPK::StaticEmitter::create();
    waveEmitter->setZone(SPK::Point::create());
    waveEmitter->setFlow(-1);
    waveEmitter->setTank(1);
    
    //
    // Groups
    //
    
    // smoke group
    SPK::Group* smokeGroup = SPK::Group::create(smokeModel,15);
    smokeGroup->addEmitter(smokeEmitter);
    smokeGroup->setRenderer(smokeRenderer);
    smokeGroup->setGravity(SPK::Vector3D(0.0f,0.0f,0.05f));

    // flame group
    SPK::Group* flameGroup = SPK::Group::create(flameModel,15);
    flameGroup->addEmitter(flameEmitter);
    flameGroup->setRenderer(flameRenderer);

    // flash group
    SPK::Group* flashGroup = SPK::Group::create(flashModel,3);
    flashGroup->addEmitter(flashEmitter);
    flashGroup->setRenderer(flashRenderer);

    // spark 1 group
    SPK::Group* spark1Group = SPK::Group::create(spark1Model,20);
    spark1Group->addEmitter(spark1Emitter);
    spark1Group->setRenderer(spark1Renderer);
    spark1Group->setGravity(SPK::Vector3D(0.0f,0.0f,-1.5f));

    // spark 2 group
    SPK::Group* spark2Group = SPK::Group::create(spark2Model,400);
    spark2Group->addEmitter(spark2Emitter);
    spark2Group->setRenderer(spark2Renderer);
    spark2Group->setGravity(SPK::Vector3D(0.0f,0.0f,-0.3f));
    spark2Group->setFriction(0.4f);

    // wave group
    SPK::Group* waveGroup = SPK::Group::create(waveModel,1);
    waveGroup->addEmitter(waveEmitter);
    waveGroup->setRenderer(waveRenderer);
    
    //
    // System
    //
    SPK::System* system = SPK::System::create();
    system->addGroup(waveGroup);
    system->addGroup(smokeGroup);
    system->addGroup(flameGroup);
    system->addGroup(flashGroup);
    system->addGroup(spark1Group);
    system->addGroup(spark2Group);
    return system->getSPKID();
}
SPK::SPK_ID createFire( const SparkDrawable::TextureIDMap& textureIDMap, int screenWidth, int screenHeight )
{
    SparkDrawable::TextureIDMap::const_iterator itr;
    GET_TEXTURE_ID( "fire", textureFire );
    GET_TEXTURE_ID( "explosion", textureSmoke );

    // Renderers
    SPK::GL::GLQuadRenderer* fireRenderer = SPK::GL::GLQuadRenderer::create();
    fireRenderer->setScale(0.3f,0.3f);
    fireRenderer->setTexturingMode(SPK::TEXTURE_2D);
    fireRenderer->setTexture(textureFire);
    fireRenderer->setTextureBlending(GL_MODULATE);
    fireRenderer->setBlending(SPK::BLENDING_ADD);
    fireRenderer->enableRenderingHint(SPK::DEPTH_WRITE,false);
    fireRenderer->setAtlasDimensions(2,2);

    SPK::GL::GLQuadRenderer* smokeRenderer = SPK::GL::GLQuadRenderer::create();
    smokeRenderer->setScale(0.3f,0.3f);
    smokeRenderer->setTexturingMode(SPK::TEXTURE_2D);
    smokeRenderer->setTexture(textureSmoke);
    smokeRenderer->setTextureBlending(GL_MODULATE);
    smokeRenderer->setBlending(SPK::BLENDING_ALPHA);
    smokeRenderer->enableRenderingHint(SPK::DEPTH_WRITE,false);
    smokeRenderer->setAtlasDimensions(2,2);

    // Models
    SPK::Model* fireModel = SPK::Model::create(
                                SPK::FLAG_RED | SPK::FLAG_GREEN | SPK::FLAG_BLUE | SPK::FLAG_ALPHA |
                                SPK::FLAG_SIZE | SPK::FLAG_ANGLE | SPK::FLAG_TEXTURE_INDEX,
                                SPK::FLAG_RED | SPK::FLAG_GREEN | SPK::FLAG_ALPHA | SPK::FLAG_ANGLE,
                                SPK::FLAG_RED | SPK::FLAG_GREEN | SPK::FLAG_TEXTURE_INDEX | SPK::FLAG_ANGLE,
                                SPK::FLAG_SIZE);
    fireModel->setParam(SPK::PARAM_RED,0.8f,0.9f,0.8f,0.9f);
    fireModel->setParam(SPK::PARAM_GREEN,0.5f,0.6f,0.5f,0.6f);
    fireModel->setParam(SPK::PARAM_BLUE,0.3f);
    fireModel->setParam(SPK::PARAM_ALPHA,0.4f,0.0f);
    fireModel->setParam(SPK::PARAM_ANGLE,0.0f,2.0f * osg::PI,0.0f,2.0f * osg::PI);
    fireModel->setParam(SPK::PARAM_TEXTURE_INDEX,0.0f,4.0f);
    fireModel->setLifeTime(1.0f,1.5f);

    SPK::Interpolator* interpolator = fireModel->getInterpolator(SPK::PARAM_SIZE);
    interpolator->addEntry(0.5f,2.0f,5.0f);
    interpolator->addEntry(1.0f,0.0f);

    SPK::Model* smokeModel = SPK::Model::create(
                                 SPK::FLAG_RED | SPK::FLAG_GREEN | SPK::FLAG_BLUE | SPK::FLAG_ALPHA |
                                 SPK::FLAG_SIZE | SPK::FLAG_ANGLE | SPK::FLAG_TEXTURE_INDEX,
                                 SPK::FLAG_RED | SPK::FLAG_GREEN | SPK::FLAG_SIZE | SPK::FLAG_ANGLE,
                                 SPK::FLAG_TEXTURE_INDEX | SPK::FLAG_ANGLE,
                                 SPK::FLAG_ALPHA);
    smokeModel->setParam(SPK::PARAM_RED,0.3f,0.2f);
    smokeModel->setParam(SPK::PARAM_GREEN,0.25f,0.2f);
    smokeModel->setParam(SPK::PARAM_BLUE,0.2f);
    smokeModel->setParam(SPK::PARAM_ALPHA,0.2f,0.0f);
    smokeModel->setParam(SPK::PARAM_SIZE,5.0,10.0f);
    smokeModel->setParam(SPK::PARAM_TEXTURE_INDEX,0.0f,4.0f);
    smokeModel->setParam(SPK::PARAM_ANGLE,0.0f,2.0f * osg::PI,0.0f,2.0f * osg::PI);
    smokeModel->setLifeTime(5.0f,5.0f);

    interpolator = smokeModel->getInterpolator(SPK::PARAM_ALPHA);
    interpolator->addEntry(0.0f,0.0f);
    interpolator->addEntry(0.2f,0.2f);
    interpolator->addEntry(1.0f,0.0f);

    // Emitters
    // The emitters are arranged so that the fire looks realistic
    SPK::StraightEmitter* fireEmitter1 = SPK::StraightEmitter::create(SPK::Vector3D(0.0f,0.0f,1.0f));
    fireEmitter1->setZone(SPK::Sphere::create(SPK::Vector3D(0.0f,0.0f,-1.0f),0.5f));
    fireEmitter1->setFlow(40);
    fireEmitter1->setForce(1.0f,2.5f);

    SPK::StraightEmitter* fireEmitter2 = SPK::StraightEmitter::create(SPK::Vector3D(1.0f,0.0f,0.6f));
    fireEmitter2->setZone(SPK::Sphere::create(SPK::Vector3D(0.15f,0.075f,-1.2f),0.1f));
    fireEmitter2->setFlow(15);
    fireEmitter2->setForce(0.5f,1.5f);

    SPK::StraightEmitter* fireEmitter3 = SPK::StraightEmitter::create(SPK::Vector3D(-0.6f,-0.8f,0.8f));
    fireEmitter3->setZone(SPK::Sphere::create(SPK::Vector3D(-0.375f,-0.375f,-1.15f),0.3f));
    fireEmitter3->setFlow(15);
    fireEmitter3->setForce(0.5f,1.5f);

    SPK::StraightEmitter* fireEmitter4 = SPK::StraightEmitter::create(SPK::Vector3D(-0.8f,0.2f,0.5f));
    fireEmitter4->setZone(SPK::Sphere::create(SPK::Vector3D(-0.255f,0.225f,-1.2f),0.2f));
    fireEmitter4->setFlow(10);
    fireEmitter4->setForce(0.5f,1.5f);

    SPK::StraightEmitter* fireEmitter5 = SPK::StraightEmitter::create(SPK::Vector3D(0.1f,-1.0f,0.8f));
    fireEmitter5->setZone(SPK::Sphere::create(SPK::Vector3D(-0.075f,-0.3f,-1.2f),0.2f));
    fireEmitter5->setFlow(10);
    fireEmitter5->setForce(0.5f,1.5f);

    SPK::SphericEmitter* smokeEmitter = SPK::SphericEmitter::create(SPK::Vector3D(0.0f,0.0f,1.0f),0.0f,0.5f * osg::PI);
    smokeEmitter->setZone(SPK::Sphere::create(SPK::Vector3D(),1.2f));
    smokeEmitter->setFlow(25);
    smokeEmitter->setForce(0.5f,1.0f);

    // Groups
    SPK::Group* fireGroup = SPK::Group::create(fireModel,135);
    fireGroup->addEmitter(fireEmitter1);
    fireGroup->addEmitter(fireEmitter2);
    fireGroup->addEmitter(fireEmitter3);
    fireGroup->addEmitter(fireEmitter4);
    fireGroup->addEmitter(fireEmitter5);
    fireGroup->setRenderer(fireRenderer);
    fireGroup->setGravity(SPK::Vector3D(0.0f,0.0f,3.0f));

    SPK::Group* smokeGroup = SPK::Group::create(smokeModel,135);
    smokeGroup->addEmitter(smokeEmitter);
    smokeGroup->setRenderer(smokeRenderer);
    smokeGroup->setGravity(SPK::Vector3D(0.0f,0.0f,0.4f));

    // System
    SPK::System* particleSystem = SPK::System::create();
    particleSystem->addGroup(smokeGroup);
    particleSystem->addGroup(fireGroup);
    return particleSystem->getSPKID();
}