Apple Motion 4 - Manual (Page 633)

To apply a shape as the geometry shape source for a particle emitter, drag the shape
to the Source Shape well in the Emitter Inspector (once Geometry is chosen from the
Shape pop-up menu).
• Image: Particles emerge from within an area defined by an image or from only the
edges of the image. The image may or may not have an alpha channel. If it does, the
shape of the alpha channel can also be used to define the emitter shape. The Image
shape displays additional parameters. The following image on the right shows the
image used as the emitter image source. The image on the left shows the particles
emerging from within the image.
To apply an image as the image source for a particle emitter, drag the image to the
Image Source well in the Emitter Inspector (once Image is chosen from the Shape
pop-up menu).
633 Chapter 11 Working with Particles