[vtkusers] Writing Postscript files from VTK

[Carl Hetherington]

Hi,

I'm interested in writing vector Postscript files of VTK renderings.
Consulting the mailing list archive suggests that gl2ps might be able to
do this.  I've tried the following example:

/* Set up a render window with a wireframe representation of a
** vtkPolyData.
*/

/* ... */

  FILE* fp = fopen("test.eps", "w");
  int buffsize = 0;
  int state = GL2PS_OVERFLOW;

  while (state == GL2PS_OVERFLOW)
  {
    buffsize += 1024*1024;
    gl2psBeginPage("Title", "Software", GL2PS_EPS, 0,
		 GL2PS_SIMPLE_LINE_OFFSET, GL_RGBA, 0, NULL,
		   buffsize, fp, NULL);
    window->Render();
    state = gl2psEndPage();
  }

  fclose(fp);

Unfortunately this gives me zero-sized EPS files, with gl2ps saying
"GL2PS warning: Empty feedback buffer".

Can anyone show me how it is done?

Thanks in advance,
Carl