Here's the code I used;
public Object3D createLine3D(SimpleVector from, SimpleVector to)
{
Object3D object=new Object3D(4);
SimpleVector delta=to.calcSub(from);
SimpleVector zaxis=delta.getRotationMatrix().getZAxis();
zaxis=zaxis.normalize();
zaxis.rotateY(1.571f);
SimpleVector from1=new SimpleVector(from);
from1.add(zaxis);
SimpleVector to1=new SimpleVector(to);
to1.add(zaxis);
object.addTriangle(from, 0, 0, from1, 0, 1, to1, 1, 1);
object.addTriangle(to1,1,1,to,1,0,from,0,0);
from1=new SimpleVector(from);
from1.y-=2f;
to1=new SimpleVector(to);
to1.y-=1f;
object.addTriangle(from, 0, 0, from1, 0, 1, to1, 1, 1);
object.addTriangle(to1,1,1,to,1,0,from,0,0);
object.build();
object.setCulling(Object3D.CULLING_DISABLED);
return object;
}