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Action:
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Returns the parameter range of a surface.
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Filename:
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kern/kern_scm/surf_scm.cxx
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Syntax:
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(surface:range srf [box-pos-1 box-pos-2])
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Arg Types:
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srf
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surface
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box-pos-1
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position
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box-pos-2
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position
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Returns:
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pair
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Description:
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Given a surface and (optionally) a 3-space box, returns the u and v parameter ranges of the surface. Interfaces to the C++ surface::param_range member function.
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The returned
value is a pair with the first being the u range and the second one being the v range. Note #f is used when any end of an interval is unbounded, so for example, (0 . #f) represents an interval starting at 0 but which is unbounded above. An empty interval can be recognized by the first value of the pair being greater than the second.
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srf specifies a surface.
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box-pos-1 defines the first of diagonal corners of an option box.
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box-pos-2 defines the other diagonal corner.
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Example:
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; surface:range
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; Create a conical surface.
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(define cone1 (face:cone (position 20 20 4)
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(position 20 20 8) 2.5 0 0 360 0.6))
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;; cone1
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(surface:range (surface:from-face cone1))
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;; ((#f . 1.88679622641132)
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;;
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(-3.14159265358979 . 3.14159265358979))
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