Syntax:

coverage_threshold = <float>;

Range:

0 to 1

Default:

0.5

Purpose:

To set a threshold of subsamples required for the pixel as a whole to be considered part of the object and not part of the background.

Comments:

For example, if coverage threshold is set to 0.5 (50%) then at least half of the subsamples must strike the object, or it will be considered as a “missed ray” determined by the mask generated by the renderer. This actually lets you control the “bleed” around the edges of a sprite.

• This feature is very important for games design, as all current games systems have no way to alpha-blend a sprite into a background—sprite pixels are either ON or OFF.
• For image compositing, Coverage Threshold should be set to 0.0.

Used only if composite_rendering = ON.

Example:

coverage_threshold = 0.5