Figure 7.13

Changing material types in the Material Editor dialog box

4. The Material/Map Browser dialog box appears (see Figure 7.14). Choose Matte/Shadow from the list of materials and click OK.

5. The Matte/Shadow material and its parameters appear in the Material Editor dialog box. Uncheck Opaque Alpha in the Matte group. When this setting is unchecked, the matted objects will not contribute to the alpha channel, so the rendering can be used for compositing. In the Shadow group, uncheck Receive Shadows and uncheck Affect Alpha; we will deal with shadows differently later in this tutorial.

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