Index: trunk/src/Makefile.dep
===================================================================
--- trunk/src/Makefile.dep	(revision 35993)
+++ trunk/src/Makefile.dep	(revision 35994)
@@ -702,6 +702,7 @@
  ../src_3rd/fast89-poly2tri/fast89_poly2tri.h \
  ../src_plugins/export_stl/exp_fmt_stl.c \
  ../src_plugins/export_stl/exp_fmt_amf.c \
+ ../src_plugins/export_stl/exp_fmt_proj.c \
  ../src_plugins/export_stl/stl_models.c \
  ../src_plugins/export_stl/model_load_stl.c \
  ../src_plugins/export_stl/model_load_amf.c \
Index: trunk/src_plugins/export_stl/exp_fmt_proj.c
===================================================================
--- trunk/src_plugins/export_stl/exp_fmt_proj.c	(nonexistent)
+++ trunk/src_plugins/export_stl/exp_fmt_proj.c	(revision 35994)
@@ -0,0 +1,74 @@
+/*
+ *                            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 proj_print_header(FILE *f)
+{
+	fprintf(f, "obj \"board\"\n");
+	fprintf(f, "	realempty\n");
+
+	verthash_init(&verthash);
+}
+
+static void proj_print_footer(FILE *f)
+{
+	long n, *vx;
+	rnd_coord_t *c;
+
+
+	fprintf(f, "	verts\n");
+	for(n = 0, c = verthash.vxcoords.array; n < verthash.next_id; n++, c += 3)
+		rnd_fprintf(f, "		%.09mm %.09mm %.09mm\n", c[0], c[1], c[2]);
+
+	for(n = 0, vx = verthash.triangles.array; n < verthash.triangles.used; n += 3, vx += 3) {
+		if (vx[0] < 0) {
+			vx++;
+			n++;
+			fprintf(f, "	color %.6f %.6f %.6f\n", (double)vx[0]/1000000, (double)vx[1]/1000000, (double)vx[2]/1000000);
+			continue; /* shift colors */
+		}
+		rnd_fprintf(f, "		tri :%ld :%ld :%ld\n", vx[0], vx[1], vx[2]);
+	}
+	fprintf(f, "	normals\n");
+
+	verthash_uninit(&verthash);
+}
+
+static const stl_fmt_t fmt_proj = {
+	/* output */
+	".pro",
+	amf_print_horiz_tri,
+	amf_print_vert_tri,
+	amf_print_facet,
+	amf_new_obj,
+	proj_print_header,
+	proj_print_footer,
+
+	/* model load */
+	"projector",
+	"projector::translate", NULL,
+	"projector::rotate", NULL,
+	NULL /* no loader yet */
+};
Index: trunk/src_plugins/export_stl/export_stl.c
===================================================================
--- trunk/src_plugins/export_stl/export_stl.c	(revision 35993)
+++ trunk/src_plugins/export_stl/export_stl.c	(revision 35994)
@@ -47,7 +47,7 @@
 #include "../lib_polyhelp/topoly.h"
 #include "../lib_polyhelp/triangulate.h"
 
-static rnd_hid_t stl_hid, amf_hid;
+static rnd_hid_t stl_hid, amf_hid, proj_hid;
 const char *stl_cookie = "export_stl HID";
 
 static const rnd_export_opt_t stl_attribute_list[] = {
@@ -354,8 +354,9 @@
 
 #include "exp_fmt_stl.c"
 #include "exp_fmt_amf.c"
+#include "exp_fmt_proj.c"
 
-static const stl_fmt_t *fmt_all[] = {&fmt_amf, &fmt_stl, NULL};
+static const stl_fmt_t *fmt_all[] = {&fmt_amf, &fmt_stl, &fmt_proj, NULL};
 
 #include "stl_models.c"
 #include "model_load_stl.c"
@@ -372,6 +373,11 @@
 	return stl_get_export_options_(hid, n, &fmt_amf);
 }
 
+static const rnd_export_opt_t *proj_get_export_options(rnd_hid_t *hid, int *n)
+{
+	return stl_get_export_options_(hid, n, &fmt_proj);
+}
+
 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, const stl_fmt_t *fmt)
 {
 	pcb_dynf_t df;
@@ -539,6 +545,11 @@
 	stl_do_export_(hid, options, &fmt_amf);
 }
 
+static void proj_do_export(rnd_hid_t *hid, rnd_hid_attr_val_t *options)
+{
+	stl_do_export_(hid, options, &fmt_proj);
+}
+
 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);
@@ -587,14 +598,25 @@
 	rnd_hid_register_hid(&stl_hid);
 	rnd_hid_load_defaults(&stl_hid, stl_attribute_list, NUM_OPTIONS);
 
+
 	memcpy(&amf_hid, &stl_hid, sizeof(rnd_hid_t));
 	amf_hid.name = "amf";
 	amf_hid.description = "export board outline in 3-dimensional AMF";
-	stl_hid.get_export_options = amf_get_export_options;
+	amf_hid.get_export_options = amf_get_export_options;
 	amf_hid.do_export = amf_do_export;
 
 	rnd_hid_register_hid(&amf_hid);
 	rnd_hid_load_defaults(&amf_hid, stl_attribute_list, NUM_OPTIONS);
 
+
+	memcpy(&proj_hid, &stl_hid, sizeof(rnd_hid_t));
+	proj_hid.name = "projector";
+	proj_hid.description = "export board outline as a projector(1) object for 3d rendering";
+	proj_hid.get_export_options = proj_get_export_options;
+	proj_hid.do_export = proj_do_export;
+
+	rnd_hid_register_hid(&proj_hid);
+	rnd_hid_load_defaults(&proj_hid, stl_attribute_list, NUM_OPTIONS);
+
 	return 0;
 }