2012

Off Turns off display and calculation of shadows for the light. Turning shadows
off increases performance.
Sharp Displays shadows with sharp edges. Use this option to increase
performance.
Soft Mapped Displays realistic shadows with soft edges.
Enter map size [64/128/256/512/1024/2048/4096] <256>:
Specifies the amount of memory to use to calculate the shadow map.
Enter softness (1-10) <1>:
Specifies the softness to use to calculate the shadow map.
Soft Sampled Displays realistic shadows with softer shadows (penumbra)
based on extended light sources.
Enter an option to change [Shape/sAmples/Visible/eXit]<eXit> :
Specify the shape of the shadow by entering s and then the dimensions of the
shape. (For example, the radius of the sphere or the length and width of a
rectangle.)
Enter shape [Linear, Disk, Rect, Sphere,Cylinder] <Sphere>:
Specify the sample size by entering a.
Enter Shadow Sample <16.0000>:
Specify the visibility of the shape by for the shadow by entering v.
Enter Shape Visibility [Yes/No]<No>:
Attenuation
Enter an option to change [attenuation Type/Use limits/attenuation start
Limit/attenuation End limit/eXit]<eXit>:
Attenuation Type Controls how light diminishes over distance. The farther
away an object is from a point light, the darker the object appears. Attenuation
is also known as decay.
Enter attenuation type [None/Inverse linear/inverse Squared] <Inverse linear>:
■ None. Sets no attenuation. Objects far from the point light are as bright
as objects close to the light.
■ Inverse Linear. Sets attenuation to be the inverse of the linear distance
from the light. For example, at a distance of 2 units, light is half as strong
as at the point light; at a distance of 4 units, light is one quarter as strong.
The default value for inverse linear is half the maximum intensity.
■ Inverse Squared. Sets attenuation to be the inverse of the square of the
distance from the light. For example, at a distance of 2 units, light is one
1532 | Chapter 16 P Commands