The Image Alpha filter replaces the image's alpha channel with the channel specified by the filter mask.
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Rendering menu > Video Post > Video Post toolbar >
(Add Image Filter Event) > Choose Image Alpha Filter from the Filter Plug-In list.
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Rendering menu > Video Post > Video Post window > Select an Alpha Filter. > Video Post toolbar >
(Edit Current Event)
The filter takes whatever channel is selected in the channel options under Mask (including g-buffer channel data) and applies it to the queue's alpha channel, thereby replacing what's there.
If you don't choose a mask, this filter has no effect.
There are no setup options for this filter.
Procedures
To set an object's G-Buffer ID:
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Select the object. - Right-click the object and then choose Properties from the popup menu.
- In the Object Properties dialog, set G-Buffer Object Channel to a nonzero value, and then click OK.
The G-Buffer ID can be any positive integer.
If you give the same G-Buffer ID value to more than one object, all these objects will be post-processed.