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Spread Gain field Displays the amount of gain applied to the spread. Editable.
Spread Variance field Displays how much the spread varies. Editable.
Pattern Tab(s)
Use the pattern settings to control the texture before it is applied to the lens flare or ray. The settings in the
Pattern tabs vary depending on the component type. You can get a quick description of each setting by
viewing its tooltip.
Relighting: Rays
Use rays to simulate volumetric effects. You can attach a Rays object to a light in Action.
You can position rays behind 2D or 3D objects to generate effects, although rays are still visible even without
an object to outline them. When semi-transparent objects are positioned in front of the light, it is possible
to generate volumetric rays that use the colour of the object.
Adding a Rays Object to a Light
In Action, a ray is a child of a light. Multiple lights can be parented to the same Rays object.
To add a ray to the scene.
1 Add and position a light to your scene.
2 Do one of the following:
■ Drag the rays node from the node bin and place it in the schematic.
■ Double-click the rays node.
A Rays object is added to the schematic. In Result view, you can see the ray.
If there is only one light in the scene, the rays node is automatically connected to it. If there are several
lights in the scene, select the light in the schematic that you want parented to the rays node before
added the rays node. Otherwise, you can parent the rays node to the light or lights manually in the
schematic.
554 | Chapter 15 Compositing in 3D Space with Action