1TDCTRI(3NCARG)                   NCAR GRAPHICS                  TDCTRI(3NCARG)
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NAME

6       TDCTRI - Cut triangles defined by a triangle list.
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SYNOPSIS

9       CALL TDCTRI (RTRI, MTRI, NTRI, IAXS, RCUT)
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C-BINDING SYNOPSIS

12       #include <ncarg/ncargC.h>
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14       void c_tdctri(float *rtri, int mtri, int *ntri, int iaxs, float rcut)
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DESCRIPTION

17       This routine, given a list of NTRI triangles in the array RTRI, an axis
18       identifier IAXS (1 => U axis, 2 => V axis, 3 => W axis), and a value
19       RCUT along that axis, cuts all the triangles that intersect the plane
20       perpendicular to the identified axis at the specified value into two
21       pieces, one on either side of the plane.  This is useful when one is
22       rendering the triangles in colors that depend on their position in U,
23       V, or W.  (See the example "tdex04".)
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25       The arguments of TDCTRI are as follows:
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27       RTRI    (an input/output array, of type REAL, dimensioned 10 x MTRI) -
28               a list of triangles, probably created by means of calls to
29               TDSTRI, TDITRI, and/or TDMTRI.  The number of triangles in the
30               list may increase as a result of calling TDCTRI.
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32       MTRI    (an input expression of type INTEGER) - the second dimension of
33               RTRI and thus the maximum number of triangles the triangle list
34               will hold.
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36       NTRI    (an input/output variable of type INTEGER) - specifies the
37               number of triangles currently in the list.  It is the user's
38               responsibility to zero this initially; its value is increased
39               by each call to a triangle-generating routine like TDSTRI or
40               TDITRI and may be increased by a call to TDCTRI.
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42       IAXS    (an input variable of type INTEGER) - specifies the axis to
43               which the cut plane is perpendicular (1 => U axis, 2 => V axis,
44               3 => W axis).
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46       RCUT    (an input variable of type REAL) - specifies that value of U,
47               V, or W at which the cut plane intersects the axis.
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C-BINDING DESCRIPTION

50       The C-binding argument descriptions are the same as the FORTRAN
51       argument descriptions.
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ACCESS

54       To use TDCTRI or c_tdctri, load the NCAR Graphics libraries ncarg,
55       ncarg_gks, and ncarg_c, preferably in that order.
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SEE ALSO

58       Online: tdclrs, tddtri, tdgeti, tdgetr, tdgrds, tdgrid, tdgtrs, tdinit,
59       tditri, tdlbla, tdlbls, tdline, tdlnpa, tdmtri, tdpack, tdpack_params,
60       tdpara, tdplch, tdprpa, tdprpi, tdprpt, tdseti, tdsetr, tdsort, tdstri,
61       tdstrs
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64       Copyright (C) 1987-2009
65       University Corporation for Atmospheric Research
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67       The use of this Software is governed by a License Agreement.
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71UNIX                               July 1997                    TDCTRI(3NCARG)
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