tdez3d uses Tdpack entries to draw an isosurface on a specified workstation.


    procedure tdez3d(
        wid[1]    : graphic,
        x[*]      : float,
        y[*]      : float,
        z[*]      : float,
        u[*][*][*]: float,
        value[1]  : float,
        rmult[1]  : float,
        theta[1]  : float,
        phi[1]    : float,
        ist[1]    : integer


An NCL workstation identifier for where you want to draw your surface. The identifier wid is the value returned from an NCL call that created a workstation.
A 1-dimensional array specifying X-coordinate values.
A 1-dimensional array specifying X-coordinate values.
A 1-dimensional array specifying Z-coordinate values.
A 3-dimensional array specifying functional values at the X, Y, and Z coordinate values in the first three arguments. The values of u are stored with the first dimension varying the fastest, i.e. u(i,j,k) is the data value at (x(i),y(j),z(k)) for i=0, dimsizes(x), j=0,dimsizes(y), and k=0,dimsizes(z).
rmult, theta, phi
Values specifying an eye position (the point from which the isosurface will be viewed); these values are defined as follows:

Thus, the coordinate (rmult*DL,theta,phi) is the spherical coordinate for the eye position. If rmult = theta = phi = 0., a default eye position ( 2.5,-55.,70.) is chosen.

The point looked at is calculated to be the midpoint of the box determined by the x, y, and z array limits.

A style index defining the colors used to shade the isosurface. The legal values for ist are as follows:

1produce a wire-frame surface
2use gray shades underneath; gray shades on top
3use gray shades underneath; red shades on top
4use gray shades underneath; green shades on top
5use gray shades underneath; blue shades on top
6use gray shades underneath; cyan shades on top
7use gray shades underneath; gray shades on top
8use gray shades underneath; magenta shades on top

If ist is positive, then black is used for the background color and white for the foreground color; if ist is the negative of any of the above values, then white is used for the background color and black for the foreground color. If ist falls outside of the legal range, it is defaulted to 6.


When tdez3d is called, a color table is defined for the workstation specified by wid in the first argument. This color table will supersede any color table that has been previously defined. The color table that is defined is:

Color indexColors
0black if IST is positive; white if IST is negative
1white if IST is positive; black if IST is negative
8-37grayscale from white to black
38-67shades of gray
68-97shades of red
98-127shades of green
128-157shades of blue
158-187shades of cyan
188-217shades of magenta
218-247shades of yellow

tdez3d does not call frame.


The following code fragment:

;  Create an X11 workstation.

      wid = create "tdez3d_example" xWorkstationClass defaultapp
        "wkPause" : True
      end create

;  Draw isosurface plot.
      tdez3d(wid, xo, yo, zo, u, 1., 0., 0., 0., 6)
will draw an isosurface plot of the u array (with isovalue 1.) in shades of cyan with a black background using a default eye position.

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$Revision: 1.4 $ $Date: 1998/11/11 23:32:23 $