Function:ns2ssq

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==ns2ssq== ==ns2ssq==
-Set/query general surface quality.+Set general surface quality.
==Prototype== ==Prototype==
Line 9: Line 9:
==Description== ==Description==
-Set/query general surface quality high (1) or low (0, default). The former calculates weighted normals for all vertices, while the latter calculates a single normal per facet of the surface. The former should be used for export to VRML.+Set general surface quality high (1) or low (0, default). The former calculates weighted normals for all vertices, while the latter calculates a single normal per facet of the surface. The former should be used for export to VRML.
==See Also== ==See Also==
 +<table>
 +<tr><td>[[Function:ns2qsq | ns2qsq]]</td><td>Query the general surface quality. </td></tr>
 +<tr><td>[[Function:ns2cis | ns2cis]]</td><td>Create an isosurface object. </td></tr>
 +<tr><td>[[Function:ns2cisc | ns2cisc]]</td><td>Create an isosurface object with a colour function.</td></tr>
 +<tr><td>[[Function:ns2dis | ns2dis ]]</td><td>Draw an isosurface object </td></tr>
 +<tr><td>[[Function:ns2sisl | ns2sisl ]]</td><td>Change the level of isosurface </td></tr>
 +<tr><td>[[Function:ns2sisc | ns2sisc]]</td><td>Set the colour for an isosurface. </td></tr>
 +</table>
==Code Example== ==Code Example==
<code><pre> <code><pre>
-</pre></code>+#include <stdio.h>
 +#include <stdlib.h>
 +#include <math.h>
 +#include "s2plot.h"
-[[S2PLOT:Function List | Back]] to S2PLOT function list.+#define CELLS 30
 +int id1; /* Global variable: isosurface id */
 +void cb(double *t, int *kc)
 +{
 + char string[255];
 + int isq = ns2qsq(); /* Query the surface quality */
 + sprintf(string,"Surface quality is: %d. Press <space> to toggle",isq);
 + s2lab("","","",string); /* Show a label on screen */
 + ns2ssq(*kc%2); /* Set the surface quality */
 + ns2dis(id1, 1); /* Display an isosurface */
-__NOTOC__+}
-__NOEDITSECTION__+
 +int main(int argc, char *argv[])
 +{
 + int i, j, k; /* Loop variables */
 + float x, y, z; /* Dummy variables for grid values */
 + int nx, ny, nz; /* Number of cells in grid */
 + float ***grid; /* Grid data */
 + float tr[12]; /* Transformation matrix */
 + int resolution; /* Resolution of isosurface */
 + float level; /* Isosurface level to plot */
 + float alpha; /* Alpha channel */
 + char trans; /* Drawing mode for isosurface */
-Back to [[Function:Template | template]] page.+ nx = CELLS; /* Grid dimensions */
 + ny = CELLS;
 + nz = CELLS;
 + 
 + /* Create transpose matrix mapping data indices to world coords */
 + tr[0] = tr[4] = tr[8] = 0.0; /* Offsets */
 + tr[1] = tr[6] = tr[11] = 1.0; /* Increments */
 + tr[2] = tr[3] = tr[5] = tr[7] = tr[9] = tr[10] = 0.; /* Cross terms */
 + 
 + s2opend("/?",argc, argv); /* Open the display */
 + s2swin(0, nx-1, 0, ny-1, 0, nz-1); /* Set the window coordinates */
 + s2box("BCDET",0,0,"BCDET",0,0,"BCDET",0,0); /* Draw coordinate box */
 + 
 + /* allocate and generate the data grid */
 + grid = (float ***)malloc(nx * sizeof(float **));
 + for (i = 0; i < nx; i++) {
 + grid[i] = (float **)malloc(ny * sizeof(float *));
 + x = (float)(i) / (float)(nx - 1);
 + for (j = 0; j < ny; j++) {
 + grid[i][j] = (float *)malloc(nz * sizeof(float));
 + y = (float)(j) / (float)(ny - 1);
 + for (k = 0; k < nz; k++) {
 + z = (float)(k) / (float)(nz - 1);
 + grid[i][j][k] = x*x*x + y*y - z*z*z*z;
 + }
 + }
 + }
 + level = 0.2; /* Set the isosurface level */
 + resolution = 1; /* Set the isosurface resolution */
 + alpha = 0.9; /* Set the alpha channel */
 + trans = 'o'; /* Opaque isosurface */
 + 
 +/* Create the isosurface object */
 + 
 + id1 = ns2cis(grid, nx, ny, nz, 0, nx-1, 0, ny-1, 0, nz-1,
 + tr, level, resolution, trans, alpha, 1., 1., 0.);
 + 
 + cs2scb(cb); /* Install dynamic callback */
 + 
 + s2show(1); /* Open the s2plot window */
 + 
 + return 1;
 +}
 +</pre></code>
 + 
 +[[S2PLOT:Function List | Back]] to S2PLOT function list.
 + 
 +__NOTOC__
 +__NOEDITSECTION__

Current revision

ns2ssq

Set general surface quality.

Prototype

void ns2ssq(int hiq);

Description

Set general surface quality high (1) or low (0, default). The former calculates weighted normals for all vertices, while the latter calculates a single normal per facet of the surface. The former should be used for export to VRML.

See Also

ns2qsqQuery the general surface quality.
ns2cisCreate an isosurface object.
ns2ciscCreate an isosurface object with a colour function.
ns2dis Draw an isosurface object
ns2sisl Change the level of isosurface
ns2siscSet the colour for an isosurface.

Code Example

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include "s2plot.h"

#define CELLS 30

int id1;                                /* Global variable: isosurface id */

void cb(double *t, int *kc)
{
   char string[255];
   int isq = ns2qsq();                  /* Query the surface quality */
   sprintf(string,"Surface quality is: %d. Press <space> to toggle",isq);
   s2lab("","","",string);              /* Show a label on screen */
   ns2ssq(*kc%2);                       /* Set the surface quality */
   ns2dis(id1, 1);                      /* Display an isosurface */

}

int main(int argc, char *argv[])
{
   int i, j, k;                         /* Loop variables */
   float x, y, z;                       /* Dummy variables for grid values */
   int nx, ny, nz;                      /* Number of cells in grid */
   float ***grid;                       /* Grid data */
   float tr[12];                        /* Transformation matrix */
   int resolution;                      /* Resolution of isosurface */
   float level;                         /* Isosurface level to plot */
   float alpha;                         /* Alpha channel */
   char trans;                          /* Drawing mode for isosurface */

   nx = CELLS;                          /* Grid dimensions */
   ny = CELLS;
   nz = CELLS;

  /* Create transpose matrix mapping data indices to world coords */
   tr[0] = tr[4] = tr[8] = 0.0;                           /* Offsets */
   tr[1] = tr[6] = tr[11] = 1.0;                          /* Increments */
   tr[2] = tr[3] = tr[5] = tr[7] = tr[9] = tr[10] = 0.;   /* Cross terms */

   s2opend("/?",argc, argv);                    /* Open the display */
   s2swin(0, nx-1, 0, ny-1, 0, nz-1);           /* Set the window coordinates */
   s2box("BCDET",0,0,"BCDET",0,0,"BCDET",0,0);  /* Draw coordinate box */

   /* allocate and generate the data grid */
   grid = (float ***)malloc(nx * sizeof(float **));
   for (i = 0; i < nx; i++) {
      grid[i] = (float **)malloc(ny * sizeof(float *));
      x = (float)(i) / (float)(nx - 1);
      for (j = 0; j < ny; j++) {
         grid[i][j] = (float *)malloc(nz * sizeof(float));
         y = (float)(j) / (float)(ny - 1);
         for (k = 0; k < nz; k++) {
            z = (float)(k) / (float)(nz - 1);
            grid[i][j][k] = x*x*x + y*y - z*z*z*z;
         }
      }
   }
   level      = 0.2;                    /* Set the isosurface level */
   resolution = 1;                      /* Set the isosurface resolution */
   alpha      = 0.9;                    /* Set the alpha channel */
   trans      = 'o';                    /* Opaque isosurface */

/* Create the isosurface object */

   id1 = ns2cis(grid, nx, ny, nz, 0, nx-1, 0, ny-1, 0, nz-1,
                   tr, level, resolution, trans, alpha, 1., 1., 0.);

   cs2scb(cb);                          /* Install dynamic callback */

   s2show(1);                           /* Open the s2plot window */

   return 1;
}

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