Memory-leak in Geomview?

[Willy - Bernhard Strothmann <willy at uni-paderborn.de>]

Dear Madams and Sirs!

I wrote some (simple) external modules for GeomView 1.4.1. under SGI.
After some time, the rotation of the camera around the oscillating mesh
got slower and unsteady (I think becuse of swapping). At the end the
application went down with a message like: not enough SWAP-Area.

Any hints, suggestions?

Thank you in advance,

Willy

P.S.: please excuse my english/american.

P.P.S.: Here follow the three external modules:


_________________________________Kaukante_________________________________


/*
 * example1.c: oscillating mesh
 *
 * This example module is distributed with the geomview manual.
 * If you are not reading this in the manual, see the "External
 * Modules" chapter of the manual for more details.
 *
 * This module creates an oscillating mesh.
 */

#include <math.h>
#include <stdio.h>

/* F is the function that we plot
 */
float F(x,y,t)
     float x,y,t;
{
  float r = sqrt(x*x+y*y);
  return(sin(r + t)*sqrt(r));
}

main(argc, argv)        
     char **argv;
{
  int xdim, ydim;
  float xmin, xmax, ymin, ymax, dx, dy, t, dt;

  xmin = ymin = -5;             /* Set x and y            */
  xmax = ymax = 5;              /*    plot ranges         */
  xdim = ydim = 24;             /* Set x and y resolution */
  dt = 0.1;                     /* Time increment is 0.1  */

  /* Geomview setup.  We begin by sending the command
   *            (geometry example { : foo})
   * to geomview.  This tells geomview to create a geom called
   * "example" which is an instance of the handle "foo".
   */
  printf("(geometry example { : foo })\n");
  fflush(stdout);

  /* Loop until killed.
   */
  for (t=0; ; t+=dt) {
    UpdateMesh(xmin, xmax, ymin, ymax, xdim, ydim, t);
  }
}

/* UpdateMesh sends one mesh iteration to geomview.  This consists of
 * a command of the form
 *    (read geometry { define foo
 *       MESH
 *       ...
 *    })
 * where ... is the actual data of the mesh.  This command tells
 * geomview to make the value of the handle "foo" be the specified
 * mesh.
 */
UpdateMesh(xmin, xmax, ymin, ymax, xdim, ydim, t)
     float xmin, xmax, ymin, ymax, t;
     int xdim, ydim;
{
  int i,j;
  float x,y, dx,dy;

  dx = (xmax-xmin)/(xdim-1);
  dy = (ymax-ymin)/(ydim-1);

  printf("(read geometry { define foo \n");
  printf("MESH\n");
  printf("%1d %1d\n", xdim, ydim);
  for (j=0, y = ymin; j<ydim; ++j, y += dy) {
    for (i=0, x = xmin; i<xdim; ++i, x += dx) {
      printf("%f %f %f\t", x, y, F(x,y,t));
    }
    printf("\n");
  }
  printf("})\n");
  fflush(stdout);
}



_________________________________Kaukante_________________________________


/*
 * willy1.c: camera for the oscillating mesh
 */

#include <stdio.h>

main(argc, argv)        
     char **argv;
{
  /* Initialisierung der Camera */
  printf( "(if (real-id \"willy1\")                           \n"
          "    ()                                             \n"
          "    (new-camera willy1 { : willy1_cam })           \n"
          ")                                                  \n"
          "(look example \"willy1\")                          \n"
          "(transform-incr \"willy1\" \"example\" \"willy1\"  \n"
          "                rotate 360 0 0 800.0)              \n");
  fflush(stdout);
}


_________________________________Kaukante_________________________________


/*
 * willy2.c: camera-fly around the oscillating mesh
 */

#include <stdio.h>

main(argc, argv)        
     char **argv;
{
  /* Initialisierung der Camera */
  printf( "(if (real-id \"willy2\")                           \n"
          "    ()                                             \n"
          "    (new-camera willy2 { : willy2_cam })           \n"
          ")                                                  \n"
          "(look example \"willy2\")                          \n"
          "(transform-incr \"willy2\" \"example\" \"willy2\"  \n"
          "                rotate 360 360 0 1000.0)           \n");
  fflush(stdout);
}