diff -r 000000000000 -r 2f259fa3e83a ode/src/collision_transform.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ode/src/collision_transform.cpp	Tue Feb 02 01:00:49 2010 +0200
@@ -0,0 +1,209 @@
+/*************************************************************************
+ *                                                                       *
+ * Open Dynamics Engine, Copyright (C) 2001,2002 Russell L. Smith.       *
+ * All rights reserved.  Email: russ@q12.org   Web: www.q12.org          *
+ *                                                                       *
+ * This library is free software; you can redistribute it and/or         *
+ * modify it under the terms of EITHER:                                  *
+ *   (1) The GNU Lesser General Public License as published by the Free  *
+ *       Software Foundation; either version 2.1 of the License, or (at  *
+ *       your option) any later version. The text of the GNU Lesser      *
+ *       General Public License is included with this library in the     *
+ *       file LICENSE.TXT.                                               *
+ *   (2) The BSD-style license that is included with this library in     *
+ *       the file LICENSE-BSD.TXT.                                       *
+ *                                                                       *
+ * This library 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 files    *
+ * LICENSE.TXT and LICENSE-BSD.TXT for more details.                     *
+ *                                                                       *
+ *************************************************************************/
+
+/*
+
+geom transform
+
+*/
+
+#include <ode/collision.h>
+#include <ode/matrix.h>
+#include <ode/rotation.h>
+#include <ode/odemath.h>
+#include "collision_transform.h"
+#include "collision_util.h"
+
+//****************************************************************************
+// dxGeomTransform class
+
+struct dxGeomTransform : public dxGeom {
+  dxGeom *obj;		// object that is being transformed
+  int cleanup;		// 1 to destroy obj when destroyed
+  int infomode;		// 1 to put Tx geom in dContactGeom g1
+
+  // cached final object transform (body tx + relative tx). this is set by
+  // computeAABB(), and it is valid while the AABB is valid.
+  dxPosR transform_posr;
+
+  dxGeomTransform (dSpaceID space);
+  ~dxGeomTransform();
+  void computeAABB();
+  void computeFinalTx();
+};
+
+
+dxGeomTransform::dxGeomTransform (dSpaceID space) : dxGeom (space,1)
+{
+  type = dGeomTransformClass;
+  obj = 0;
+  cleanup = 0;
+  infomode = 0;
+  dSetZero (transform_posr.pos,4);
+  dRSetIdentity (transform_posr.R);
+}
+
+
+dxGeomTransform::~dxGeomTransform()
+{
+  if (obj && cleanup) delete obj;
+}
+
+
+void dxGeomTransform::computeAABB()
+{
+  if (!obj) {
+    dSetZero (aabb,6);
+    return;
+  }
+
+  // backup the relative pos and R pointers of the encapsulated geom object
+  dxPosR* posr_bak = obj->final_posr;
+
+  // compute temporary pos and R for the encapsulated geom object
+  computeFinalTx();
+  obj->final_posr = &transform_posr;
+
+  // compute the AABB
+  obj->computeAABB();
+  memcpy (aabb,obj->aabb,6*sizeof(dReal));
+
+  // restore the pos and R
+  obj->final_posr = posr_bak;
+}
+
+
+// utility function for dCollideTransform() : compute final pos and R
+// for the encapsulated geom object
+
+void dxGeomTransform::computeFinalTx()
+{
+  dMULTIPLY0_331 (transform_posr.pos,final_posr->R,obj->final_posr->pos);
+  transform_posr.pos[0] += final_posr->pos[0];
+  transform_posr.pos[1] += final_posr->pos[1];
+  transform_posr.pos[2] += final_posr->pos[2];
+  dMULTIPLY0_333 (transform_posr.R,final_posr->R,obj->final_posr->R);
+}
+
+//****************************************************************************
+// collider function:
+// this collides a transformed geom with another geom. the other geom can
+// also be a transformed geom, but this case is not handled specially.
+
+int dCollideTransform (dxGeom *o1, dxGeom *o2, int flags,
+		       dContactGeom *contact, int skip)
+{
+
+
+  dxGeomTransform *tr = (dxGeomTransform*) o1;
+  if (!tr->obj) return 0;
+
+
+  // backup the relative pos and R pointers of the encapsulated geom object,
+  // and the body pointer
+  dxPosR *posr_bak = tr->obj->final_posr;
+  dxBody *bodybak = tr->obj->body;
+
+  // compute temporary pos and R for the encapsulated geom object.
+  // note that final_pos and final_R are valid if no GEOM_AABB_BAD flag,
+  // because computeFinalTx() will have already been called in
+  // dxGeomTransform::computeAABB()
+
+  if (tr->gflags & GEOM_AABB_BAD) tr->computeFinalTx();
+  tr->obj->final_posr = &tr->transform_posr;
+  tr->obj->body = o1->body;
+
+  // do the collision
+  int n = dCollide (tr->obj,o2,flags,contact,skip);
+
+  // if required, adjust the 'g1' values in the generated contacts so that
+  // thay indicated the GeomTransform object instead of the encapsulated
+  // object.
+  if (tr->infomode) {
+    for (int i=0; i<n; i++) {
+      dContactGeom *c = CONTACT(contact,skip*i);
+      c->g1 = o1;
+    }
+  }
+
+  // restore the pos, R and body
+  tr->obj->final_posr = posr_bak;
+  tr->obj->body = bodybak;
+  return n;
+}
+
+//****************************************************************************
+// public API
+
+EXPORT_C dGeomID dCreateGeomTransform (dSpaceID space)
+{
+  return new dxGeomTransform (space);
+}
+
+
+EXPORT_C void dGeomTransformSetGeom (dGeomID g, dGeomID obj)
+{
+
+  dxGeomTransform *tr = (dxGeomTransform*) g;
+  if (tr->obj && tr->cleanup) delete tr->obj;
+  tr->obj = obj;
+}
+
+
+EXPORT_C dGeomID dGeomTransformGetGeom (dGeomID g)
+{
+
+  dxGeomTransform *tr = (dxGeomTransform*) g;
+  return tr->obj;
+}
+
+
+EXPORT_C void dGeomTransformSetCleanup (dGeomID g, int mode)
+{
+
+  dxGeomTransform *tr = (dxGeomTransform*) g;
+  tr->cleanup = mode;
+}
+
+
+EXPORT_C int dGeomTransformGetCleanup (dGeomID g)
+{
+
+  dxGeomTransform *tr = (dxGeomTransform*) g;
+  return tr->cleanup;
+}
+
+
+EXPORT_C void dGeomTransformSetInfo (dGeomID g, int mode)
+{
+
+  dxGeomTransform *tr = (dxGeomTransform*) g;
+  tr->infomode = mode;
+}
+
+
+EXPORT_C int dGeomTransformGetInfo (dGeomID g)
+{
+
+  dxGeomTransform *tr = (dxGeomTransform*) g;
+  return tr->infomode;
+}