//now add springs between adjacent boxes
hkpStiffSpringConstraintData* spring = new hkpStiffSpringConstraintData(); 
hkpStiffSpringConstraintData* spring2 = new hkpStiffSpringConstraintData(); 

	for(size_t i=0;i<boxes.size()-1;i++) {
		hkTransform b1 = boxes[i]->getTransform();
		hkTransform b2 = boxes[i+1]->getTransform();
		hkVector4f t1 = b1.getTranslation(); 
		hkVector4f t2 = b2.getTranslation();
		t1.add(hkVector4f(-0.5,0.5,0));
		t2.add(hkVector4f(-0.5,-0.5,0));
	
		spring->setInWorldSpace(b1,b2, t1, t2);
		{
			hkpConstraintInstance* constraint = new hkpConstraintInstance(boxes[i], boxes[i+1], spring );
				g_pWorld->addConstraint(constraint);
			constraint->removeReference(); 
		}
	
		t1.add(hkVector4f(1,0,0));
		t2.add(hkVector4f(1,0,0));
	
		spring2->setInWorldSpace(b1,b2, t1, t2);
		{
			hkpConstraintInstance* constraint = new hkpConstraintInstance(boxes[i], boxes[i+1], spring2 );
				g_pWorld->addConstraint(constraint);
			constraint->removeReference(); 
		}
	}
	spring->removeReference();
	spring2->removeReference(); 
}