ray:valid?

List of:	Scheme Extensions
Subjects:	Ray Testing
Contents:	Kernel

Action:

Tests whether a ray is valid.

Filename:

kern/kern_scm/ray_scm.cxx

Syntax:

(ray:valid? ray)

Arg Types:

ray

ray

Returns:

boolean

Description:

A ray is considered invalid if the length of the vector is zero.

ray specifies the ray to be tested for validity.

Example:

; ray:valid?

; Test whether an interactively read ray is valid.

(ray:valid? (read-ray))

;; #t

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