2011

Table Of Contents
DescriptionProperty
Rotates the texture over a surface.Rotation
Using the Shadow Matte Shader
The Shadow Matte shader lets you capture shadows created by using 3D objects
as proxies. This creates the illusion of shadows cast from objects or image
elements onto 2D images where none exist. The resulting output using this
shader is a black and white image that shows the shadows in black, and
everything else in white.
For example, if you have an image of a cityscape, and you want to have a red
balloon fly overhead, casting a shadow as it travels, you could create your
balloon using a sphere, add a light source to illuminate it, and then add a
planar surface parallel to the ground to receive the shadow. You would then
select the Shadow Matte shader to use on the plane, and set the Blending
Mode to Multiply to mask out the plane, except for the shadow. You can then
animate the sphere, and the shadow will follow it.
To set Shadow Matte parameters:
1 Select the Materials tab.
2 Select a layer from the Layer Editor, and then select the Shadow Matte
shader.
3 Set parameters to control how light or dark the shadow should look, and
to invert the shadow.
DescriptionParameter
Uniformly scales the lightness or darkness of the shadow up or down.Multiplier
Flips the shadow inside out to reveal the background in the shadow
regions and mask the illuminated areas.
Invert Shadow
Working with Lights
Light is a basic geometric 3D scene element. Each light in a scene contributes
to how a scene is illuminated. Lights affect the way all object's surfaces appear
268 | Chapter 12 Multilayer Compositing and 3D Effects