Emitter Type
Sets the shape and functionality of the emitter. There are seven types:

		Point All particles are born at the same point.			Box Particles are born within a box. For sake of illustration, velocity is zero here.
		Sphere Particles are born within a sphere. For sake of illustration, velocity is zero here.			Grid Particles are born on a 2D or 3D grid. Read more about Grid Emitter.
		Light Particles are born from the lights in the comp. Read about using Light Emitters.			Layer Particles are born from a layer in the comp. Read about using Layer Emitters.
		Layer Grid Particles are born from a layer in the comp in the shape of the Grid Emitter. Read about using the Layer Grid.