Image courtesy of Quentin Chaillet (www.qchaillet.com)
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- Bitmap, feed with an existing black and white mask in any image format, manually painted or, more frequently, generated from an external channel export.
- Alpha, use the scene Alpha channel obtained during the full frame process.
- Custom Alpha, use any Custom Alpha channel –from object, material or even groups of objects and materials– defined on the scene and obtained during the full frame process.
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During the render
During the first step of the render process, the engine is rendering the full frame as usual. The SL parameter indicates the global sampling level of the whole image as with any regular render. The Extra Sampling parameter aside displays n/a (not activated), indicating that the extra sampling has not started. (and indicates that the render is still operating in full frame mode).
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