9

Area Shadows Rollout 1359
The shape of the area shadow array affects how shadows
are cast.
Left: Rectangle
Right: Box
2-Sided Sha dows—When on, backfaces are not
ignored when calculating shadows. Objects seen
fromtheinsidearenotlitbylightsfromthe
outside. This costs a bit more render time. When
off,backfacesareignored.Renderingisquicker,
but outside lights illuminate object interiors.
The faces inside the sliced sphere do not cast shadows if
2-Sided Shadows is off.
Antialiasing Options group
Shadow Integrity—Sets the number of rays in the
initial bundle of rays cast. These rays are projected
from every surface that receives ligh t from the
light source.
Thenumberofraysisasfollows:
1=4 rays
2=5 rays
3 to N=NxN rays.
For example, setting Shadow Integrity to 5
generates 25 rays.
This is the primary control for “finding” small
objects and thin spaces b etween objects. If the
shadows are missing a small object in your scene,
tryincreasingShadowIntegrityonestepatatime.
Also, if the penumbra (soft area) is blotchy, try
increasing this setting.
Increasing the Shadow Integrity value creates more accurate
shadow contour and detail.
Shadow Quality—Sets the total number of r ays cast
in the penumbra (soft area) region, including the
rays fired in the first p ass.
These rays are projected f rom every point that is in
the penumbra, or antialiased e dge of the shadow,
to smooth it out.
Thenumberofraysisasfollows:
•2=5rays
•3toN=NxN
For example, setting Shadow Quality to 5 generates
25 rays.
The Shadow Quality value should always be greater
than the Shadow Integrity value. This is because
the software ove rlays the secondary rays atop the
first pass’s rays using the same algorithm.