From 17997c0541f9e9a04a70927594970d8059582106 Mon Sep 17 00:00:00 2001
From: David Rose <david@ddrose.com>
Date: Wed, 12 May 2004 22:25:58 +0000
Subject: [PATCH] clear pointer on reading bam

---
 panda/src/parametrics/sheetNode.cxx | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/panda/src/parametrics/sheetNode.cxx b/panda/src/parametrics/sheetNode.cxx
index ac174220d7..2a4a4d0fb8 100644
--- a/panda/src/parametrics/sheetNode.cxx
+++ b/panda/src/parametrics/sheetNode.cxx
@@ -63,6 +63,7 @@ void SheetNode::CData::
 fillin(DatagramIterator &scan, BamReader *reader) {
   // For now, we skip over the NULL pointer that we wrote out.
   reader->skip_pointer(scan);
+  _surface.clear();
 }
 
 ////////////////////////////////////////////////////////////////////
@@ -188,7 +189,12 @@ output(ostream &out) const {
 void SheetNode::
 write(ostream &out, int indent_level) const {
   PandaNode::write(out, indent_level);
-  indent(out, indent_level) << get_surface() << "\n";
+  NurbsSurfaceEvaluator *surface = get_surface();
+  if (surface != (NurbsSurfaceEvaluator *)NULL) {
+    indent(out, indent_level + 2) << *surface << "\n";
+  } else {
+    indent(out, indent_level + 2) << "(no surface)\n";
+  }
 }
 
 ////////////////////////////////////////////////////////////////////