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Action:
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Determines if a Scheme object is a face.
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Filename:
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kern/kern_scm/qfac_scm.cxx
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Syntax:
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(face? object)
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Arg Types:
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object
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scheme-object
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Returns:
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boolean
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Description:
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The extension returns
#t if the object is a face; otherwise, it returns
#f.
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object specifies the
scheme-object that has to be queried for a face.
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Example:
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; face?
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; Create a solid block.
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(define block1
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(solid:block (position -10 -5 -15)
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(position 10 5 15)))
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;; block1
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; Get the block's faces.
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(define faces1 (entity:faces block1))
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;; faces1
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(face? block1)
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;; #f
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; Determine if face 2 is a face.
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(face? (car (cdr faces1)))
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;; #t
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