--- gnuconv.c.orig	Fri Jul 23 11:49:48 1999
+++ gnuconv.c	Fri Jul 23 22:29:24 1999
@@ -28,6 +28,7 @@
 -s size; the x and y size of the rendered image
 -P for ppm output
 -X for output in X11 window
+-d for dump polygon data
 
 ciao
 Carsten Hammer
@@ -62,6 +63,8 @@
 int c,block;
 int size;
 
+int dump=0;
+
 sipp_init();
 mode=PHONG;
 output=PPM;
@@ -69,7 +72,7 @@
 
 		/* shameless stolen from sipp demos 	*/
 
-while ((c=getopt(argc,argv,"XPpgfls:")) !=EOF)
+while ((c=getopt(argc,argv,"XPpgfls:d")) !=EOF)
   {
     switch (c) {
           case 'X':
@@ -99,6 +102,10 @@
           case 's':
             size = atoi(optarg);
             break;
+
+	  case 'd':
+	    dump = 1;
+	    break;
 	 }
   }
 
@@ -162,10 +169,12 @@
     (*feld)[i][2]=((*feld)[i][2]-zmid)*zsize;
   }
 
+if (!dump) {
 lightsource_create(1.0,1.0,1.0, 1.0,1.0,1.0, LIGHT_DIRECTION);
 
 image_fd=fopen("out.ppm","w");
 sipp_show_backfaces(TRUE);
+}
 
 feldgroesse=(int)(sqrt((double)ii/2));
 /* printf("Koordinatenanzahl=%i,Feld ist %i**2 in der Eingabedatei!\n",ii,feldgroesse);
@@ -178,6 +187,7 @@
    for (spalte=1;spalte<=feldgroesse-1;spalte++)
      {
        ru=zeile*feldgroesse+spalte;
+       if (!dump) {
        vertex_push((*feld)[ru][0],(*feld)[ru][1],(*feld)[ru][2]);
        vertex_push((*feld)[ru-1][0],(*feld)[ru-1][1],(*feld)[ru-1][2]);
        vertex_push((*feld)[ru-1-feldgroesse][0],
@@ -194,8 +204,20 @@
 	(*feld)[ru-1-feldgroesse][2]);
        vertex_push((*feld)[ru][0],(*feld)[ru][1],(*feld)[ru][2]);
        polygon_push();
+       } else {
+       printf("%6.3f %6.3f %6.3f\n", (*feld)[ru][0],(*feld)[ru][1],(*feld)[ru][2]);
+       printf("%6.3f %6.3f %6.3f\n", (*feld)[ru-1][0],(*feld)[ru-1][1],(*feld)[ru-1][2]);
+       printf("%6.3f %6.3f %6.3f\n", (*feld)[ru-1-feldgroesse][0],(*feld)[ru-1-feldgroesse][1],(*feld)[ru-1-feldgroesse][2]);
+       printf("\n");
+       printf("%6.3f %6.3f %6.3f\n", (*feld)[ru][0],(*feld)[ru][1],(*feld)[ru][2]);
+       printf("%6.3f %6.3f %6.3f\n", (*feld)[ru-feldgroesse][0],(*feld)[ru-feldgroesse][1],(*feld)[ru-feldgroesse][2]);
+       printf("%6.3f %6.3f %6.3f\n", (*feld)[ru-1-feldgroesse][0],(*feld)[ru-1-feldgroesse][1],(*feld)[ru-1-feldgroesse][2]);
+       printf("\n");
+       }
      }  
  }
+if (dump) return(0);
+
 mysurface= surface_basic_create(0.4 ,0.5,0.5,0.8 ,0.6 ,0.1 ,1.0,1.0,1.0);
 myobjekt=object_create();
 object_add_surface(myobjekt,mysurface);