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

6       Isosurface_params - This document briefly describes all Isosurface
7       internal parameters.
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DESCRIPTION

10       Parameter descriptions, in alphabetical order, of all Isosurface
11       internal parameters follow. Each description begins with a line giving
12       the parameter name and the intrinsic FORTRAN type of the parameter.
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14       'IU' - Integer
15              Number of extra slabs to be interpolated between each pair of
16              slabs perpendicular to the U axis. Using a non-zero value takes
17              longer, but makes a better picture. Negate the value to
18              interpolate the extra slabs but not draw them, which has the
19              effect of reducing errors due to being able to see between
20              slabs.  Attempting to give 'IU' a value less than -10 will give
21              it the value -10; similarly, trying to give it a value greater
22              than 10 will give it the value 10. The default value is 0.
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24       'IV' - Integer
25              Like 'IU', but applies to extra slabs perpendicular to the V
26              axis. The default value is 0.
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28       'IW' - Integer
29              Like 'IU', but applies to extra slabs perpendicular to the W
30              axis. The default value is 0.
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32       'RF' - Integer
33              Controls drawing of reference planes and axes. Zero means "don't
34              draw them"; non-zero means "draw them". The default value is 1.
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36       'RS' - Real
37              Zero turns off the "relative size" feature; the 3D grid box will
38              be scaled to fill almost the entire plotter frame.  Give 'RS' a
39              non-zero value to turn on the "relative size" feature and to
40              specify that distance from which the box, when viewed from the
41              direction which makes its image largest, almost fills the frame.
42              Views from closer in will give a bigger image and views from
43              farther out will give a smaller image.  This is useful when
44              making movies with the "camera" flying around the box. The
45              default value is 0.
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47       'SL' - Real
48              Segment length. When contours are smoothed, this parameter
49              specifies the approximate length of the line segments used to
50              draw the smooth curves. Values outside the range from 0.0001 to
51              0.1 will be mapped to the nearer end of that range. The default
52              value is 0.01.
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54       'SM' - Integer
55              Screen model selector. Zero selects the coarse screen model (128
56              x 128); non-zero selects a finer screen model (256 x 256). Using
57              the former is faster, but using the latter gives better
58              pictures.  The default value is 0.
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60       'ST' - Real
61              Spline tension. If zero, turns off the smoothing of contours. If
62              non-zero, turns the smoother on and determines the tension on
63              the splines used to do the smoothing. Use of values greater than
64              about 15. has been observed to cause overflow on some machines.
65              The default value is 0.
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67       'SV' - Integer
68              Special value. The value zero turns off the special-value
69              feature. A non-zero value turns on the feature and specifies the
70              special value itself. Regions filled with this value are treated
71              as being outside the volume bounded by the isosurface.
72              Preliminary experiments seem to indicate that sometimes the use
73              of special values works well and sometimes it doesn't (depending
74              on the pattern of the special values in the field). The default
75              value is 0.
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77       'VB' - Real
78              The position of the bottom edge of the viewport in which the
79              isosurface is to be displayed, expressed as a fraction between 0
80              (the bottom edge of the frame) and 1 (the top edge of the
81              frame). The default value is 0.
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83       'VL' - Real
84              The position of the left edge of the viewport in which the
85              isosurface is to be displayed, expressed as a fraction between 0
86              (the left edge of the frame) and 1 (the right edge of the
87              frame). The default value is 0.
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89       'VR' - Real
90              The position of the right edge of the viewport in which the
91              isosurface is to be displayed, expressed as a fraction between 0
92              (the left edge of the frame) and 1 (the right edge of the
93              frame). The default value is 1.
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95       'VT' - Real
96              The position of the top edge of the viewport in which the
97              isosurface is to be displayed, expressed as a fraction between 0
98              (the bottom of the frame) and 1 (the top edge of the frame). The
99              default value is 1.
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SEE ALSO

102       Online: isgeti, isgetr, isseti, issetr
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104       Hardcopy: NCAR Graphics Fundamentals, UNIX Version
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107       Copyright (C) 1987-2009
108       University Corporation for Atmospheric Research
109       The use of this Software is governed by a License Agreement.
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113UNIX                              March 1993         Isosurface_params(3NCARG)
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