diff --git a/simgear/scene/model/placementtrans.cxx b/simgear/scene/model/placementtrans.cxx
new file mode 100644
index 00000000..963244e9
--- /dev/null
+++ b/simgear/scene/model/placementtrans.cxx
@@ -0,0 +1,98 @@
+// placementtrans.hxx -- class for carrying transforms for placing models in the world
+//
+// Written by Mathias Froehlich, started April 2005.
+//
+// Copyright (C) 2005 Mathias Froehlich
+//
+// This program is free software; you can redistribute it and/or
+// modify it under the terms of the GNU General Public License as
+// published by the Free Software Foundation; either version 2 of the
+// License, or (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful, but
+// WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+//
+
+
+#ifndef __cplusplus                                                          
+# error This library requires C++
+#endif                                   
+
+#include <simgear/compiler.h>
+#include <simgear/constants.h>
+
+#include <plib/sg.h>
+#include <plib/ssg.h>
+
+#include "placementtrans.hxx"
+
+ssgPlacementTransform::ssgPlacementTransform(void)
+{
+}
+
+ssgPlacementTransform::~ssgPlacementTransform(void)
+{
+}
+
+ssgBase *ssgPlacementTransform::clone(int clone_flags)
+{
+  ssgPlacementTransform *b = new ssgPlacementTransform;
+  b->copy_from(this, clone_flags);
+  return b;
+}
+
+void
+ssgPlacementTransform::copy_from(ssgPlacementTransform *src, int clone_flags)
+{
+  ssgBaseTransform::copy_from(src, clone_flags);
+  sgdCopyVec3(_placement_offset, src->_placement_offset);
+  sgdCopyVec3(_scenery_center,  src->_scenery_center);
+}
+
+void ssgPlacementTransform::setTransform(sgdVec3 off)
+{
+  sgdCopyVec3(_placement_offset, off);
+  sgdVec3 tmp;
+  sgdSubVec3(tmp, _placement_offset, _scenery_center);
+  sgMat4 tmat;
+  sgZeroVec4(tmat[0]);
+  tmat[0][0] = 1;
+  sgZeroVec4(tmat[1]);
+  tmat[1][1] = 1;
+  sgZeroVec4(tmat[2]);
+  tmat[2][2] = 1;
+  sgSetVec3(tmat[3], tmp);
+  tmat[3][3] = 1;
+  ssgTransform::setTransform(tmat);
+}
+
+void ssgPlacementTransform::setTransform(sgdVec3 off, sgMat4 rot)
+{
+  sgdCopyVec3(_placement_offset, off);
+  sgdVec3 tmp;
+  sgdSubVec3(tmp, _placement_offset, _scenery_center);
+  sgMat4 tmat;
+  sgCopyVec4(tmat[0], rot[0]);
+  sgCopyVec4(tmat[1], rot[1]);
+  sgCopyVec4(tmat[2], rot[2]);
+  sgSetVec3(tmat[3], tmp);
+  tmat[3][3] = 1;
+  ssgTransform::setTransform(tmat);
+}
+
+void ssgPlacementTransform::setSceneryCenter(sgdVec3 xyz)
+{
+  sgdCopyVec3(_scenery_center, xyz);
+  sgdVec3 tmp;
+  sgdSubVec3(tmp, _placement_offset, _scenery_center);
+  sgMat4 tmat;
+  getTransform(tmat);
+  sgSetVec3(tmat[3], tmp);
+  ssgTransform::setTransform(tmat);
+}
diff --git a/simgear/scene/model/placementtrans.hxx b/simgear/scene/model/placementtrans.hxx
new file mode 100644
index 00000000..bbe80719
--- /dev/null
+++ b/simgear/scene/model/placementtrans.hxx
@@ -0,0 +1,71 @@
+// placementtrans.hxx -- class for carrying transforms for placing models in the world
+//
+// Written by Mathias Froehlich, started April 2005.
+//
+// Copyright (C) 2005 Mathias Froehlich
+//
+// This program is free software; you can redistribute it and/or
+// modify it under the terms of the GNU General Public License as
+// published by the Free Software Foundation; either version 2 of the
+// License, or (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful, but
+// WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+//
+
+
+#ifndef _SG_PLACEMENTTRANS_HXX
+#define _SG_PLACEMENTTRANS_HXX
+
+#ifndef __cplusplus                                                          
+# error This library requires C++
+#endif                                   
+
+#include <simgear/compiler.h>
+#include <simgear/constants.h>
+
+#include <plib/sg.h>
+#include <plib/ssg.h>
+
+class ssgPlacementTransform : public ssgTransform
+{
+public:
+  
+  ssgPlacementTransform(void);
+  virtual ~ssgPlacementTransform(void);
+
+//   using ssgTransform::addKid(ssgEntity*);
+
+  virtual ssgBase *clone(int clone_flags);
+protected:
+  void copy_from(ssgPlacementTransform *src, int clone_flags);
+
+private:
+//   virtual void setTransform(sgVec3 xyz);
+//   virtual void setTransform(sgCoord *xform);
+//   virtual void setTransform(sgCoord *xform, float sx, float sy, float sz);
+//   virtual void setTransform(sgMat4 xform);
+public:
+
+  void setTransform(sgdVec3 off);
+  void setTransform(sgdVec3 off, sgMat4 rot);
+  void setSceneryCenter(sgdVec3 xyz);
+
+private:
+
+  //////////////////////////////////////////////////////////////////
+  // private data                                                 //
+  //////////////////////////////////////////////////////////////////
+  
+  sgdVec3 _placement_offset;
+  sgdVec3 _scenery_center;
+    
+};
+
+#endif // _SG_LOCATION_HXX