Autodesk 62205-051408-9001 User Guide - Page 753
Modifying Lights, Creating Animations, Creating Expressions
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Using Source Lights ❚❘❘ it has no pixel information or dimensions, and is not rendered in the final output. To target a light: 1. Select the light. For more information, see Selecting Lights. 2. Select the layer that you want to set as the target from the Target list, or click the Pick button and select it in a viewport. Target Pick button The light is targeted to the selected layer. When you move the target, the light rotates to point at it. To target to a null object: 1. Select the composite. 2. Choose Object | New Null Object. Note: This option is also available in the context menu. A Null object is added at coordinates 0, 0, 0. Modifying Lights A newly created light is, by default, a white point light set to 100% intensity. You can customize the type of light, as well as its color and intensity. You can animate these properties to create lighting effects in the composite. For example, if you make the light blue at frame 0 and red at the last frame, the light gradually changes from red to blue when you play the clip. You can animate the intensity of a light to make lights "flicker," or change intensity slowly over time. For more information on animating, see Chapter 12, "Creating Animations'' and see Chapter 13, "Creating Expressions''. Note: For keyframing, if you want to start the animation at another frame than the first frame and if you do not want a keyframe to be added automatically at the first frame, check the Combustion Preferences by choosing Fie | Preferences (CTRL+;), click the Animation category under Host, and make sure Automatically Add First Key Frame is not selected. To modify a light: 1. Select the light. See Selecting Lights. 2. Click Light in the Composite Controls panel. The Light controls appear. 3. To change the type of light, enable Distant, Point, or Spot in the Light Type group. Note: If you create multiple Null objects, Combustion appends an increasing number (in parentheses) to the name of each. For example, if you create three Null objects, they are named Null Object, Null Object(2), and Null Object(3), by default. You can rename them at any time. 3. Select the light. 4. Select the Null object from the Target list. You can now move the Null object. If necessary, the light changes rotation to point at it. Note: If you enabled Spot, you can also customize the cone angle and edge softness of the light. For more information, see Modifying Spot Lights. 4. To change the intensity of the light, adjust the Intensity field. 737
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