From 37d6d7792af6af7b7ddee16bb2ace97ce5df88b2 Mon Sep 17 00:00:00 2001
From: Kyle Bayes <kylebayes@google.com>
Date: Thu, 6 Mar 2025 07:32:33 -0800
Subject: [PATCH] Fix bug with handling of invalid `maxhullvert` values
 (smaller than 4).

PiperOrigin-RevId: 734136442
Change-Id: I531e5a5b9244e026a9368e0d6a83d2b559c1b58d
---
 src/xml/xml_native_reader.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/xml/xml_native_reader.cc b/src/xml/xml_native_reader.cc
index 00f80649..7b6e8eaa 100644
--- a/src/xml/xml_native_reader.cc
+++ b/src/xml/xml_native_reader.cc
@@ -1434,7 +1434,7 @@ void mjXReader::OneMesh(XMLElement* elem, mjsMesh* mesh, const mjVFS* vfs) {
   }
 
   if (ReadAttrInt(elem, "maxhullvert", &n)) {
-    if (n != 0 && n < 4) throw mjXError(elem, "maxhullvert must be larger than 3");
+    if (n != -1 && n < 4) throw mjXError(elem, "maxhullvert must be larger than 3");
     mesh->maxhullvert = n;
   }