From 65a5654d9cdc3511df415d8fd92285b117dc2288 Mon Sep 17 00:00:00 2001
From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Fri, 23 Nov 2018 21:44:32 +0000
Subject: [PATCH 1/1] distort-stl: debugging

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
---
 distort-stl | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/distort-stl b/distort-stl
index 6dcd23c..844344c 100755
--- a/distort-stl
+++ b/distort-stl
@@ -50,17 +50,18 @@ sub maybe_subdivide_triangle ($$$$) {
     printf STDERR
 	"%11.6f,%11.6f,%11.6f / ".
 	"%11.6f,%11.6f,%11.6f / ".
-	"%11.6f,%11.6f,%11.6f ",
+	"%11.6f,%11.6f,%11.6f  %-40s ",
 		$t->[0][0], $t->[0][1], $t->[0][2],
 		$t->[1][0], $t->[1][1], $t->[1][2],
-		$t->[2][0], $t->[2][1], $t->[2][2];
+		$t->[2][0], $t->[2][1], $t->[2][2],
+		$t->[3];
     
     foreach my $ix (0..2) {
 	my $jx = ($ix+1) % 3;
 	my $kx = ($ix+2) % 3;
 	if ($edge_need_subdivide_fn->($t->[$ix], $t->[$jx])) {
 	    printf STDERR
-		" S i=%d j=%d k=%d \n",
+		" S i=%d j=%d k=%d ",
 		$ix, $jx, $kx;
 	    my @midp;
 	    foreach my $ci (0..2) {
@@ -68,8 +69,14 @@ sub maybe_subdivide_triangle ($$$$) {
 	    }
 	    # triangle i-j-k, splitting edge i-m
 	    # gives    i-m-k, k-m-j
-	    my $n = [ @$t ]; $n->[$ix] = \@midp; unshift @$changed, $n;
-	    my $n = [ @$t ]; $n->[$jx] = \@midp; unshift @$changed, $n;
+	    my $n = [ @$t ]; $n->[$ix] = \@midp;  $n->[3] = "$t->[3]a$ix$jx";
+	    unshift @$changed, $n;
+
+	    my $n = [ @$t ]; $n->[$jx] = \@midp;  $n->[3] = "$t->[3]b$ix$jx";
+	    unshift @$changed, $n;
+	    printf STDERR
+		" midp %11.6f,%11.6f,%11.6f\n",
+		@midp;
 	    return;
 	}
     }
@@ -189,6 +196,7 @@ while (<I>) {
 	push @$triangle, \@xyz;
     } elsif (m/^endloop/) {
 	die unless @$triangle == 3;
+	push @$triangle, $.;
 	push @$triangles, $triangle;
 	undef $triangle;
     } elsif (m/^(?:solid|facet\s+normal|endfacet|endsolid)\s/) {
-- 
2.30.2