Index: src_plugins/io_pads/delay_create.c
===================================================================
--- src_plugins/io_pads/delay_create.c	(revision 34587)
+++ src_plugins/io_pads/delay_create.c	(revision 34588)
@@ -49,6 +49,7 @@
 #define CRDY_BRD(y) (dlcr->flip_y ? ((dlcr->board_bbox.Y2 - (y))) : (y))
 
 #include "delay_clearance.c"
+#include "delay_postproc.c"
 
 void pcb_dlcr_init(pcb_dlcr_t *dlcr)
 {
Index: src_plugins/io_pads/delay_postproc.c
===================================================================
--- src_plugins/io_pads/delay_postproc.c	(nonexistent)
+++ src_plugins/io_pads/delay_postproc.c	(revision 34588)
@@ -0,0 +1,35 @@
+/*
+ *                            COPYRIGHT
+ *
+ *  pcb-rnd, interactive printed circuit board design
+ *
+ *  delayed creation of objects
+ *  pcb-rnd Copyright (C) 2021 Tibor 'Igor2' Palinkas
+ *  (Supported by NLnet NGI0 PET Fund in 2021)
+ *
+ *  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")
+ */
+
+#include "delay_postproc.h"
+
+void pcb_dlcr_post_poly_thermal_netname(pcb_board_t *pcb, pcb_poly_t *poly, const char *netname, pcb_thermal_t *t)
+{
+
+}
Index: src_plugins/io_pads/delay_postproc.h
===================================================================
--- src_plugins/io_pads/delay_postproc.h	(nonexistent)
+++ src_plugins/io_pads/delay_postproc.h	(revision 34588)
@@ -0,0 +1,5 @@
+#include "thermal.h"
+
+/* Set thermal on all terminals that are in the same net and within the poly */
+void pcb_dlcr_post_poly_thermal_netname(pcb_board_t *pcb, pcb_poly_t *poly, const char *netname, pcb_thermal_t *t);
+
Index: src_plugins/io_pads/read.c
===================================================================
--- src_plugins/io_pads/read.c	(revision 34587)
+++ src_plugins/io_pads/read.c	(revision 34588)
@@ -42,6 +42,7 @@
 #include <librnd/core/rotate.h>
 #include "board.h"
 #include "extobj.h"
+#include "thermal.h"
 
 #include "delay_create.h"
 #include "delay_clearance.h"
@@ -294,6 +295,18 @@
 	return -1;
 }
 
+static void postproc_thermal(pads_read_ctx_t *rctx)
+{
+	long n;
+
+	for(n = 0; n < rctx->dlcr.netname_objs.used; n += 2) {
+		pcb_any_obj_t *o = rctx->dlcr.netname_objs.array[n];
+		const char *netname = rctx->dlcr.netname_objs.array[n+1];
+		if (o->type == PCB_OBJ_POLY)
+			pcb_dlcr_post_poly_thermal_netname(rctx->pcb, o, netname, PCB_THERMAL_ROUND | PCB_THERMAL_DIAGONAL | PCB_THERMAL_ON);
+	}
+}
+
 int io_pads_parse_pcb(pcb_plug_io_t *ctx, pcb_board_t *pcb, const char *filename, rnd_conf_role_t settings_dest)
 {
 	rnd_hidlib_t *hl = &PCB->hidlib;
@@ -313,6 +326,7 @@
 
 	pcb_dlcr_init(&rctx.dlcr);
 	rctx.dlcr.flip_y = 1;
+	rctx.dlcr.save_netname_objs = 1;
 	htsp_init(&rctx.parts, strhash, strkeyeq);
 
 	/* read the header */
@@ -329,6 +343,7 @@
 	pads_assign_layers(&rctx);
 	pcb_dlcr_create(pcb, &rctx.dlcr);
 	pcb_dlcl_apply(pcb, rctx.clr);
+	postproc_thermal(&rctx);
 	pcb_dlcr_uninit(&rctx.dlcr);
 
 	genht_uninit_deep(htsp, &rctx.parts, {