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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
quarter as strong as at the point light; at a distance of 4 units, light is one
sixteenth as strong.
Use Limits Specifies whether to use limits or not.
Limits [oN/oFf] <Off>:
Attenuation Start Limit Specifies the point where light starts as an offset
from the center of the light. The default is 0.
Specify start limit offset <1.0000>:
Attenuation End Limit Specifies the point where light ends as an offset from
the center of the light. No light is cast beyond this point. Setting an end limit
increases performance where the effect of lighting is so minimal that the
calculations are wasted processing time.
Specify end limit offset <10.0000>:
818 | Chapter 16 P Commands