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ILLUMINATION Command

The intensity of a point depends on the angle between the surface normal and the light source position. The default position is at the viewpoint. Up to 9 additional light source positions may be defined; the current one is used.

`ILlumination`

When no arguments are present, the current and defined light source positions are listed.

`ILlumination VX VY VZ`

Set current light position at location (VX, VY, VZ)

`ILlumination N VX VY VZ [ Name ]`

Set light source position N at location (VX, VY, VZ) and make it the current light source. 0 <= N <= 9. If N = 0, the location is ignored and the default light at the viewpoint is used. Name, if present, is shown in the Retrieve Light submenu of the Projection menu.

`ILlumination [ N ] { Down | Up | Left Right } [ T ]`

Rotate light source position N (or current light if N is omitted) T degrees in specified direction. T defaults to 5 degrees unless set by ILLUMINATION/ANGLE. If N = 0, the rotation is ignored and the default light at the viewpoint is used.

`ILlumination Angle A`

Set default rotation angle to A degrees.