How to implement Render to Texture ( from several different camera )?

I already knew Torque supported RTT(Render to Texture). But I want to implement the minimap of RTS game and the rearview mirror. As far as I know, OGRE engine can create multiple camera and render their views to any texture by its class "Viewport". But how to implement the same function by Torque 3D? Anybody knows how to do that?

Thanks for any help in advance.