adskMaterial

Note that this is different from the Incandescence attribute in a few important ways. First, glow is added as a post-process at the end of rendering. (Incandescence just makes the surface appear brighter.) Second, glow adds a halo, which incandescence does not.

There are three settings, used for different purposes:

Opacity Gain: (the default). Matte values are calculated in the normal way (based on the transparency of the object) then multiplied by the Matte Opacity. (Matte Opacity has a default value of one, by default these attributes have no effect.) With Opacity Gain, you can animate the Matte Opacity value to change the overall transparency of the object when it is later composited.

Solid Matte: This is like Opacity Gain, except that the normally-calculated matte values are ignored in favor of the Matte Opacity setting. The entire matte for the object is set to the value of the Matte Opacity attribute. If there are transparent areas on the object, their transparency is ignored in the matte. Use this setting to composite an object with transparent parts, when you don't want the background to show through them.

Black Hole: The value of Matte Opacity is ignored, and all the matte for this material is set to be transparent. Use this when you are creating substitute geometry in a scene, which is standing in for objects in a background image that you will be compositing with later. Your stand-in objects will 'punch a hole' in the matte. This allows other computer-generated geometry to pass behind your stand-in objects. Later, when foreground and background are composited, the results will be correct, with the background object showing through the 'black hole' areas.