ENVIRONMENT4		THE BOX'S MAIN HELP: This function returns the color in the environment map MAP filtered from the region defined by direction vectors: P1, P2, P3, P4. refer to page 323-324 in the RenderMan Companion. MAP (input): This must be a string. The default is empty. The name of the environment map file to be used. refer to page 323-324 in the RenderMan Companion. P1 (input): This must be a point. This is the first direction vector which defines the region over which the environment colors are filtered. refer to page 323-324 in the RenderMan Companion. P2 (input): This must be a point. This is the second direction vector which defines the region over which the environment colors are filtered. refer to page 323-324 in the RenderMan Companion. P3 (input): This must be a point. This is the third direction vector which defines the region over which the environment colors are filtered. refer to page 323-324 in the RenderMan Companion. P4 (input): This must be a point. This is the fourth direction vector which defines the region over which the environment colors are filtered. refer to page 323-324 in the RenderMan Companion. ENV (output): This function returns the color in the environment map MAP from the direction of R. refer to page 323-324 in the RenderMan Companion.

ENVIRONMENT4

THE BOX'S MAIN HELP:

This function returns the color in the environment map MAP 
filtered from the region defined by direction vectors: P1, P2, P3, P4.
refer to page 323-324 in the RenderMan Companion.

MAP (input):

This must be a string. The default is empty.
The name of the environment map file to be used.
refer to page 323-324 in the RenderMan Companion.

P1 (input):

This must be a point.
This is the first direction vector which defines the region
over which the environment colors are filtered.
refer to page 323-324 in the RenderMan Companion.

P2 (input):

This must be a point.
This is the second direction vector which defines the region
over which the environment colors are filtered.
refer to page 323-324 in the RenderMan Companion.

P3 (input):

This must be a point.
This is the third direction vector which defines the region
over which the environment colors are filtered.
refer to page 323-324 in the RenderMan Companion.

P4 (input):

This must be a point.
This is the fourth direction vector which defines the region
over which the environment colors are filtered.
refer to page 323-324 in the RenderMan Companion.

ENV (output):

This function returns the color in 
the environment map MAP from the direction of R.
refer to page 323-324 in the RenderMan Companion.

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