Apple Motion 4 - Manual (Page 1006)

Refraction
Creates a glass-distortion effect on an image, with an optional height map. This filter
causes rasterization in 3D groups.
Original image Refraction applied with a height map
Parameters in the Inspector
Softness: Sets the amount of softness applied to the refracted edges.
Refraction: Sets the amount that the image is distorted.
Height Map: An image well that displays a thumbnail of the height map chosen. The
height map is used to determine the edges along which the image is refracted.
Map Channel: Sets the channel used to determine how the image is refracted. If a height
map is present, the channel is selected from the height map; otherwise the channel is
selected from the source object. Values can be selected from the following: Luminance
(default), Red, Green, Blue, or Alpha.
Mix: Sets what percentage of the original image is blended with the distorted image.
HUD Controls
The HUD contains the following controls: Softness, Refraction, Height Map, and Map
Channel.
1006 Chapter 16 Using Filters