Index: trunk/src_plugins/export_stl/exp_fmt_amf.c
===================================================================
--- trunk/src_plugins/export_stl/exp_fmt_amf.c	(nonexistent)
+++ trunk/src_plugins/export_stl/exp_fmt_amf.c	(revision 35965)
@@ -0,0 +1,52 @@
+/*
+ *                            COPYRIGHT
+ *
+ *  pcb-rnd, interactive printed circuit board design
+ *  Copyright (C) 2021 Tibor 'Igor2' Palinkas
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ *  Contact:
+ *    Project page: http://repo.hu/projects/pcb-rnd
+ *    lead developer: http://repo.hu/projects/pcb-rnd/contact.html
+ *    mailing list: pcb-rnd (at) list.repo.hu (send "subscribe")
+ */
+
+static void amf_print_horiz_tri(FILE *f, fp2t_triangle_t *t, int up, rnd_coord_t z)
+{
+}
+
+static void amf_print_vert_tri(FILE *f, rnd_coord_t x1, rnd_coord_t y1, rnd_coord_t x2, rnd_coord_t y2, rnd_coord_t z0, rnd_coord_t z1)
+{
+}
+
+static void amf_print_facet(FILE *f, stl_facet_t *head, double mx[16], double mxn[16])
+{
+	double v[3], p[3];
+	int n;
+
+	for(n = 0; n < 3; n++) {
+		p[0] = head->vx[n]; p[1] = head->vy[n]; p[2] = head->vz[n];
+		v_transform(v, p, mx);
+	}
+}
+
+static void amf_print_header(FILE *f)
+{
+}
+
+static void amf_print_footer(FILE *f)
+{
+}
Index: trunk/src_plugins/export_stl/export_stl.c
===================================================================
--- trunk/src_plugins/export_stl/export_stl.c	(revision 35964)
+++ trunk/src_plugins/export_stl/export_stl.c	(revision 35965)
@@ -332,9 +332,10 @@
 RND_INLINE void v_transform(double dst[3], double src[3], double mx[16]);
 
 #include "exp_fmt_stl.c"
+#include "exp_fmt_amf.c"
 #include "stl_models.c"
 
-int stl_hid_export_to_file(FILE *f, rnd_hid_attr_val_t *options, rnd_coord_t maxy, rnd_coord_t z0, rnd_coord_t z1)
+static int stl_hid_export_to_file(FILE *f, rnd_hid_attr_val_t *options, rnd_coord_t maxy, rnd_coord_t z0, rnd_coord_t z1, int fmt_amf)
 {
 	pcb_dynf_t df;
 	pcb_poly_t *brdpoly;
@@ -406,12 +407,21 @@
 
 	fp2t_triangulate(&tri);
 
-	stl_print_header(f);
+	if (fmt_amf)
+		amf_print_header(f);
+	else
+		stl_print_header(f);
 
 	/* write the top and bottom plane */
 	for(n = 0; n < tri.TriangleCount; n++) {
-		stl_print_horiz_tri(f, tri.Triangles[n], 0, z0);
-		stl_print_horiz_tri(f, tri.Triangles[n], 1, z1);
+		if (fmt_amf) {
+			amf_print_horiz_tri(f, tri.Triangles[n], 0, z0);
+			amf_print_horiz_tri(f, tri.Triangles[n], 1, z1);
+		}
+		else {
+			stl_print_horiz_tri(f, tri.Triangles[n], 0, z0);
+			stl_print_horiz_tri(f, tri.Triangles[n], 1, z1);
+		}
 	}
 
 	/* write the vertical side */
@@ -427,7 +437,10 @@
 				px = contours.array[pn], py = contours.array[pn+1];
 				cx = contours.array[n], cy = contours.array[n+1];
 /*				rnd_trace(" [%ld <- %ld] c:%f;%f p:%f;%f\n", n, pn, cx/1000000.0, cy/1000000.0, px/1000000.0, py/1000000.0);*/
-				stl_print_vert_tri(f, cx, cy, px, py, z0, z1);
+				if (fmt_amf)
+					amf_print_vert_tri(f, cx, cy, px, py, z0, z1);
+				else
+					stl_print_vert_tri(f, cx, cy, px, py, z0, z1);
 			}
 			cn += 2;
 			cn_start = cn;
@@ -437,7 +450,10 @@
 	if (options[HA_models].lng)
 		stl_models_print(PCB, f, maxy, z0, z1);
 
-	stl_print_footer(f);
+	if (fmt_amf)
+		amf_print_footer(f);
+	else
+		stl_print_footer(f);
 
 	vtp0_uninit(&cutouts);
 	for(n = 0; n < cutouts.used; n++)
@@ -449,7 +465,7 @@
 	return 0;
 }
 
-static void stl_do_export(rnd_hid_t *hid, rnd_hid_attr_val_t *options)
+static void stl_do_export_(rnd_hid_t *hid, rnd_hid_attr_val_t *options, int fmt_amf)
 {
 	const char *filename;
 	pcb_cam_t cam;
@@ -482,14 +498,24 @@
 	}
 
 	if (options[HA_zcent].lng)
-		stl_hid_export_to_file(f, options, PCB->hidlib.size_y, -thick/2, +thick/2);
+		stl_hid_export_to_file(f, options, PCB->hidlib.size_y, -thick/2, +thick/2, fmt_amf);
 	else
-		stl_hid_export_to_file(f, options, PCB->hidlib.size_y, 0, thick);
+		stl_hid_export_to_file(f, options, PCB->hidlib.size_y, 0, thick, fmt_amf);
 
 	fclose(f);
 	pcb_cam_end(&cam);
 }
 
+static void stl_do_export(rnd_hid_t *hid, rnd_hid_attr_val_t *options)
+{
+	stl_do_export_(hid, options, 0);
+}
+
+static void amf_do_export(rnd_hid_t *hid, rnd_hid_attr_val_t *options)
+{
+	stl_do_export_(hid, options, 1);
+}
+
 static int stl_parse_arguments(rnd_hid_t *hid, int *argc, char ***argv)
 {
 	rnd_export_register_opts2(hid, stl_attribute_list, sizeof(stl_attribute_list) / sizeof(stl_attribute_list[0]), stl_cookie, 0);