SPK::SPK_ID createRain( const SparkDrawable::TextureIDMap& textureIDMap, int screenWidth, int screenHeight )
{
SparkDrawable::TextureIDMap::const_iterator itr;
GET_TEXTURE_ID( "waterdrops", textureSplash );
// Inits Particle Engine
SPK::Vector3D gravity = SPK::Vector3D(0.0f,0.0f,-2.0f);
// Renderers
// the size ratio is used with renderers whose size are defined in pixels. This is to adapt to any resolution
float sizeRatio = static_cast<float>(screenWidth) / 1440;
// point renderer
SPK::GL::GLPointRenderer* dropRenderer = SPK::GL::GLPointRenderer::create();
dropRenderer->setType(SPK::POINT_CIRCLE);
dropRenderer->setSize(2.0f * sizeRatio);
dropRenderer->enableBlending(true);
// line renderer
SPK::GL::GLLineRenderer* rainRenderer = SPK::GL::GLLineRenderer::create();
rainRenderer->setLength(-0.1f);
rainRenderer->enableBlending(true);
// quad renderer
SPK::GL::GLQuadRenderer* splashRenderer = SPK::GL::GLQuadRenderer::create();
splashRenderer->setScale(0.05f,0.05f);
splashRenderer->setTexturingMode(SPK::TEXTURE_2D);
splashRenderer->setTexture(textureSplash);
splashRenderer->enableBlending(true);
splashRenderer->enableRenderingHint(SPK::DEPTH_WRITE,false);
// Models
// rain model
SPK::Model* rainModel = SPK::Model::create(
SPK::FLAG_GREEN | SPK::FLAG_RED | SPK::FLAG_BLUE | SPK::FLAG_ALPHA | SPK::FLAG_MASS,
0, SPK::FLAG_MASS);
rainModel->setParam(SPK::PARAM_ALPHA,0.2f);
rainModel->setImmortal(true);
// drop model
SPK::Model* dropModel = SPK::Model::create(
SPK::FLAG_GREEN | SPK::FLAG_RED | SPK::FLAG_BLUE | SPK::FLAG_ALPHA | SPK::FLAG_MASS,
0, SPK::FLAG_MASS);
dropModel->setParam(SPK::PARAM_ALPHA,0.6f);
// splash model
SPK::Model* splashModel = SPK::Model::create(
SPK::FLAG_GREEN | SPK::FLAG_RED | SPK::FLAG_BLUE |
SPK::FLAG_ALPHA | SPK::FLAG_SIZE | SPK::FLAG_ANGLE,
SPK::FLAG_SIZE | SPK::FLAG_ALPHA,
SPK::FLAG_SIZE | SPK::FLAG_ANGLE);
splashModel->setParam(SPK::PARAM_ANGLE,0.0f,2.0f * osg::PI);
splashModel->setParam(SPK::PARAM_ALPHA,1.0f,0.0f);
// rain emitter
SPK::Ring* rainZone = SPK::Ring::create(SPK::Vector3D(0.0f,0.0f,5.0f), SPK::Vector3D(0.0f,0.0f,1.0f));
SPK::SphericEmitter* rainEmitter = SPK::SphericEmitter::create(SPK::Vector3D(0.0f,0.0f,-1.0f),0.0f,0.03f * osg::PI);
rainEmitter->setZone(rainZone);
// drop emitter
SPK::SphericEmitter* dropEmitter = SPK::SphericEmitter::create(SPK::Vector3D(0.0f,0.0f,1.0f),0.0f,0.2f * osg::PI);
// Groups
// rain group
SPK::Group* rainGroup = SPK::Group::create(rainModel,8000);
rainGroup->setCustomUpdate(&killRain);
rainGroup->setRenderer(rainRenderer);
rainGroup->addEmitter(rainEmitter);
rainGroup->setFriction(0.7f);
rainGroup->setGravity(gravity);
// drop group
SPK::Group* dropGroup = SPK::Group::create(dropModel,16000);
dropGroup->setRenderer(dropRenderer);
//dropGroup->addEmitter(dropEmitter);
dropGroup->setFriction(0.7f);
dropGroup->setGravity(gravity);
// splash group
SPK::Group* splashGroup = SPK::Group::create(splashModel,2400);
splashGroup->setRenderer(splashRenderer);
// System
SPK::System* particleSystem = SPK::System::create();
particleSystem->addGroup(splashGroup);
particleSystem->addGroup(dropGroup);
particleSystem->addGroup(rainGroup);
// Compute rain RAIN_PARAMeters
rainModel->setParam(SPK::PARAM_RED,RAIN_PARAM(1.0f,0.40f));
rainModel->setParam(SPK::PARAM_GREEN,RAIN_PARAM(1.0f,0.40f));
rainModel->setParam(SPK::PARAM_BLUE,RAIN_PARAM(1.0f,0.42f));
rainModel->setParam(SPK::PARAM_MASS,RAIN_PARAM(0.4f,0.8f),RAIN_PARAM(0.8f,1.6f));
dropModel->setParam(SPK::PARAM_RED,RAIN_PARAM(1.0f,0.40f));
dropModel->setParam(SPK::PARAM_GREEN,RAIN_PARAM(1.0f,0.40f));
dropModel->setParam(SPK::PARAM_BLUE,RAIN_PARAM(1.0f,0.42f));
dropModel->setParam(SPK::PARAM_MASS,RAIN_PARAM(0.4f,0.8f),RAIN_PARAM(3.0f,4.0f));
dropModel->setLifeTime(RAIN_PARAM(0.05f,0.3f),RAIN_PARAM(0.1f,0.5f));
splashModel->setParam(SPK::PARAM_RED,RAIN_PARAM(1.0f,0.40f));
splashModel->setParam(SPK::PARAM_GREEN,RAIN_PARAM(1.0f,0.40f));
splashModel->setParam(SPK::PARAM_BLUE,RAIN_PARAM(1.0f,0.42f));
splashModel->setParam(SPK::PARAM_SIZE,0.0f,0.0f,RAIN_PARAM(0.375f,2.25f),RAIN_PARAM(0.75f,3.78f));
splashModel->setLifeTime(RAIN_PARAM(0.2f,0.3f),RAIN_PARAM(0.4f,0.5f));
rainEmitter->setFlow(RAIN_PARAM(0.0f,4800.0f));
rainEmitter->setForce(RAIN_PARAM(3.0f,5.0f),RAIN_PARAM(6.0f,10.0f));
rainZone->setRadius(0.0f,RAIN_PARAM(20.0f,5.0f));
dropEmitter->setForce(RAIN_PARAM(0.1f,1.0f),RAIN_PARAM(0.2f,2.0f));
dropRenderer->setSize(RAIN_PARAM(1.0f,3.0f) * sizeRatio);
rainRenderer->setWidth(RAIN_PARAM(1.0f,4.0f) * sizeRatio);
g_splashGroup = splashGroup;
g_dropGroup = dropGroup;
g_dropEmitter = dropEmitter;
return particleSystem->getSPKID();
}
