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The Location group controls affects the visibility of the lens flare, including where its light source is located and if that light source is turned on.
If you are working in After Effects, you can use Location controls to recognize AE lights and change the behavior of related parameters.
Light Source Location sets the position of the lens flare's light source in the X and Y axes. You can numerically input the X and Y values, and also change the values by moving the crosshairs or point control in the Preview Window of your host application.
You can animate the Light Source Location to place the center of the flare at a precise location on each frame. For example, you can keyframe the lens flare at its default location (pixel values 192, 144), and then at a new position of 448, 336.
An alternate way to set the light source position is using the Location Layer pop-up to specify a source layer. The Use Lights checkbox will override your position with the current position of the light.
Use Lights checkbox (After Effects only)
This checkbox applies the Knoll lens flare to an After Effects light (or lights) in the scene. Turned off by default. Turn Use Lights on to render a flare on each After Effects light in your Timeline. When Use Lights is turned on, the Light Source Location grays out. You will instead use the Lens > Depth Scale controls to set the Z axis value.
Light Source Naming, Light pop-up (After Effects only)
Click the Light field to bring up the Light Source Naming box. This dialog box controls which After Effects lights in a scene have a lens flare.
The Naming operation is very simple. Type a name into the text field. The AE lights in your Timeline with that name will take on the Knoll light properties. For example, if you type 'Bright' into the field, then AE lights named 'Bright 1', 'Super Bright' and 'Brightness 2' will all be affected.
You can always keep the default name of 'Light'. There is no limit on the number of lights that can be tied in. All lights that share the name will have the flare applied to it.
As an alternative to Light Source Location, the Location Layer is another way to set the light source position. Use this pop-up to choose a layer in your Timeline. Location Layer uses the alpha channel of this layer to set the position of the light source, and overrides the Light Source Location setting. The layer does not need to be visible in the Timeline to be used as a positioning layer.
How it works: Location Layer searches the alpha channel of the layer you select. It looks for non-black pixels and calculates the average position of these pixels. If you have a small white dot in a black alpha channel, the light effect will be placed at the center of the dot. If the alpha channel contains multiple white dots, the plug-in will average the positions of each dot and place the light at the averaged location.
If no non-black pixels exist in the alpha channel, the light effect will default to the center of the image.
There are two Location Layer options.