2008

Opacity Falloff
Real transparent surfaces vary their opacity, depending on the angle of the
material to your point of view. For example, a bottle appears more transparent
at its center than at its edge because you're looking through more glass at its
edge.
In the Extended Parameters rollout, you can specify the falloff of the
transparency, based on the angle of the face normals to the view. If a face is
perpendicular to the viewer, the angle of its normal is 0 degrees. If the face is
edge-on to the viewer, its normal angle is 90 degrees.
Falloff is either inward or outward:
In Transparency increases as the normal angle approaches 0 degrees and
decreases as the angle approaches 90 degrees. This gives the appearance of a
hollow object such as a glass ball or bottle.
Inward opacity falloff
Top: None
Bottom: 100%
Out Transparency increases as the normal angle approaches 90 degrees and
decreases as the angle approaches 0 degrees. This gives the appearance of a
solid object such as a cloudy glass marble.
7872 | Glossary