From a70a9e56d622989e9707378be5d328488e41c992 Mon Sep 17 00:00:00 2001
From: Trammell Hudson <hudson@osresearch.net>
Date: Sun, 15 Feb 2015 16:03:41 -0500
Subject: [PATCH] allow start vertex to be set

---
 faces.c  | 3 ++-
 stl_3d.c | 7 ++++---
 stl_3d.h | 3 ++-
 3 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/faces.c b/faces.c
index d1d0ab1..486382d 100644
--- a/faces.c
+++ b/faces.c
@@ -220,7 +220,8 @@ main(void)
 			stl,
 			f,
 			vertex_list,
-			face_used
+			face_used,
+			0
 		);
 
 		fprintf(stderr, "%d: %d vertices\n", i, vertex_count);
diff --git a/stl_3d.c b/stl_3d.c
index ca94efd..2aa88f7 100644
--- a/stl_3d.c
+++ b/stl_3d.c
@@ -243,11 +243,12 @@ stl_trace_face(
 	const stl_3d_t * const stl,
 	const stl_face_t * const f_start,
 	const stl_vertex_t ** vertex_list,
-	int * const face_used
+	int * const face_used,
+	const int start_vertex
 )
 {
 	const stl_face_t * f = f_start;
-	int i = 0;
+	int i = start_vertex;
 	int vertex_count = 0;
 
 	do {
@@ -288,7 +289,7 @@ stl_trace_face(
 
 		// keep going until we reach our starting face
 		// at vertex 0.
-	} while (f != f_start || i != 0);
+	} while (f != f_start || i != start_vertex);
 
 	return vertex_count;
 }
diff --git a/stl_3d.h b/stl_3d.h
index 1fb2016..04d0d1b 100644
--- a/stl_3d.h
+++ b/stl_3d.h
@@ -59,7 +59,8 @@ stl_trace_face(
 	const stl_3d_t * const stl,
 	const stl_face_t * const f_start,
 	const stl_vertex_t ** vertex_list,
-	int * const face_used
+	int * const face_used,
+	int start_vertex
 );