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Action:
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Determines if the direction of an edge is reversed relative to a face.
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Filename:
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kern/kern_scm/qedg_scm.cxx
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Syntax:
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(edge:reversed? edge face)
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Arg Types:
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edge
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edge
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face
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face
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Returns:
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boolean
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Description:
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Given an
edge and a
face that the edge lies on, this extension determines if the direction of the edge should be reversed when traversing the loop which contains the edge. This extension returns
#t if the edge is reversed; otherwise, it returns
#f.
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edge specifies an edge.
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face specifies a face.
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Example:
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; edge:reversed?
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; Create a block.
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(define block1
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(solid:block (position 0 0 0)
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(position 10 10 10)))
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;; block1
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; Get a list of the block's edges.
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(define edges1
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(entity:edges block1))
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;; edges1
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; Get a list of the block's faces.
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(define faces1
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(entity:faces block1))
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;; faces1
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(define one-edge (car edges1))
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;; one-edge
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(define one-face (car faces1))
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;; one-face
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; Determine if an edge is reverse
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; with respect to a face.
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(edge:reversed? one-edge one-face)
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;; #f
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