Jon,
I cannot reproduce this.
It just works for me with a plain cvs checkout
using that scenry tile from Scenery-0.9.8.
On Freitag 18 Februar 2005 01:24, Jon Stockill wrote:
> (gdb) bt
> #0 0x0ce8b760 in ?? ()
> #1 0x40142974 in __dynamic_cast (from=0xce8b760,
> to=0x8548f9c <typeinfo for ssgBase>, require_public=139557448,
> address=0x0, sub=0xbfffee80, subptr=0xbfffee8b)
> at ../../gcc-2.95.3/gcc/cp/tinfo2.cc:282
> #2 0x081241cc in FGGroundCache::get_agl ()
From that backtrace:
There is exactly one dynamic_cast in this function.
In theory it should never happen that the argument to that dynamic_cast is
zero.
Since I cannot reproduce it myself, can you help me?
Could you please apply the attached patch and tell me of some of thouse new
cerr output lines triggers?
Greetings
Mathias
--
Mathias Fröhlich, email: [EMAIL PROTECTED]
Index: src/FDM/groundcache.cxx
===================================================================
RCS file: /var/cvs/FlightGear-0.9/source/src/FDM/groundcache.cxx,v
retrieving revision 1.4
diff -u -r1.4 groundcache.cxx
--- src/FDM/groundcache.cxx 17 Feb 2005 10:26:14 -0000 1.4
+++ src/FDM/groundcache.cxx 18 Feb 2005 15:01:29 -0000
@@ -114,7 +114,7 @@
gp->type = FGInterface::Forest;
}
}
-
+
return gp;
}
@@ -153,6 +153,18 @@
// Check for magic texture names object names and such ...
vtxa->setUserData( extractGroundProperty( l ) );
vtxa->setCullFace( l->getCullFace() );
+
+ ssgBase *gpb = vtxa->getUserData();
+ // Assertation???
+ if ( !gpb ) {
+ cerr << "Newly created cache leaf without userdata!" << endl;
+ }
+ GroundProperty *gp = dynamic_cast<GroundProperty*>(gpb);
+ // Assertation???
+ if ( !gp ) {
+ cerr << "Newly created cache leaf where userdata is not a Ground property!" << endl;
+ }
+
// Finally append to cache.
cache_root.addKid((ssgEntity*)vtxa);
}
@@ -509,10 +521,18 @@
// AGL computations are done with triangle/surface leafs.
if (va->getPrimitiveType() != GL_TRIANGLES)
continue;
- GroundProperty *gp = dynamic_cast<GroundProperty*>(va->getUserData());
+ ssgBase *gpb = va->getUserData();
// Assertation???
- if ( !gp )
+ if ( !gpb ) {
+ cerr << "Found cache leaf without userdata!" << endl;
+ continue;
+ }
+ GroundProperty *gp = dynamic_cast<GroundProperty*>(gpb);
+ // Assertation???
+ if ( !gp ) {
+ cerr << "Found cache leaf where userdata is not a GroundProperty!" << endl;
continue;
+ }
int nt = va->getNumTriangles();
for (int i=0; i < nt; ++i) {
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