I am creating an app in unity and want to augment the 3d models in actual real world scale. When I am project a model (marker less), the projected model seems to be down scaled and doesn't match the real world. Is there any way in which the 3d models that are augmented really match the size of the actual real world object.
The only way to approximate real world scale is to make sure that the DeviceHeightAboveGround is set correctly doing the initialization phase. In the sample application, this is done in with the slider on right side of the screen.