16.particle

终于到了最后一节：粒子系统~惯例，直接上代码~

首先是创建粒子系统的代码~

		Ogre::ParticleSystem* partSystem1 = _sceneManager ->createParticleSystem("Firework1", "Firework");
		Ogre::SceneNode* node1 = _sceneManager ->getRootSceneNode() ->createChildSceneNode(Ogre::Vector3(0, 10, 0));
		node1 ->attachObject(partSystem1);

然后是几个脚本的例子~

particle_system Firework
{
	material	Examples/Smoke
	particle_width	10
	particle_height	10
	quota		5000
	billboard_type	point

	emitter Point
	{
		emission_rate 100
		direction 0 1 0
		velocity 50
		angle 360
		duration 0.1
		repeat_delay	 1
		colour_range_start 0 0 0
		colour_range_end 1 1 1
	}
}

particle_system MySmoke1
{
	material	Examples/Smoke
	particle_width	10
	particle_height	10
	quota		500
	billboard_type	point

	emitter Ring
	{
		height 50
		width 50
		inner_height 0.9
		inner_width 0.9
		emission_rate 50
		direction 0 1 0
		velocity 20
	}
}

particle_system MySmoke2
{
	material	Examples/Smoke
	particle_width	10
	particle_height	10
	quota		500
	billboard_type	point

	emitter Box
	{
		height 50
		width 50
		depth 50
		emission_rate 10
		direction 0 1 0
		velocity 20
	}
}

particle_system MySmoke3
{
	material	Examples/Smoke
	particle_width	10
	particle_height	10
	quota		500
	billboard_type	point

	emitter Point
	{
		emission_rate 30
		direction 1 0 0
		velocity	20
		time_to_live 4
		angle 30
	}
	affector DeflectorPlane
	{
		plane_point 0 20 0
		plane_normal 0 -1 0
		bounce 1.0
	}
}

其中affector用来动态改变粒子的各种属性，有：Scaler，ColourFader，ColourInterpolator，DirectionRandomiser，还有上面的DeflectorPlane