From 912f3f01628b1fa01398caaa8d9c5b342f48ec30 Mon Sep 17 00:00:00 2001
From: Sebastian Hegler <sebastian.hegler@tu-dresden.de>
Date: Mon, 6 Nov 2023 17:34:29 +0100
Subject: [PATCH] read_OBJ: allow arbitrary whitespace in "f" lines

---
 Stream_support/include/CGAL/IO/OBJ.h | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/Stream_support/include/CGAL/IO/OBJ.h b/Stream_support/include/CGAL/IO/OBJ.h
index d8123bc0073a..a2d437f96461 100644
--- a/Stream_support/include/CGAL/IO/OBJ.h
+++ b/Stream_support/include/CGAL/IO/OBJ.h
@@ -136,8 +136,11 @@ bool read_OBJ(std::istream& is,
         }
 
         // the format can be "f v1/vt1/vn1 v2/vt2/vn2 v3/vt3/vn3 ..." and we only read vertex ids for now,
-        // so skip to the next vertex
-        iss.ignore(256, ' ');
+        // so skip to the next vertex, but be tolerant about which whitespace is used
+        if (!std::isspace(iss.peek())) {
+          std::string ignoreme;
+          iss >> ignoreme;
+        }
       }
 
       if(iss.bad())