- Renovation Filter
- Axonometric / Perspective view (if perspective your camera may be looking in the wrong direction - change from one to the other and...)
- Zoom Extents - does anything appear (and check in plan view that when you Zoom Extents that there is nothing a long distance away from your model - you might have to do this for each storey)
- If in perspective mode and camera appears to be pointing in the right direction check the camera and target heights (check 3D Projection Settings)
- Place a camera and make sure camera / target heights are appropriate. Select camera then go to 3D window.