Must learn how to use complex CAD or VR software for complex productions. Resulting scenes can be very large because of digitized image quality. Can be very small. Smooth and fast navigation of even detailed scenes on most modern computers. Slow and jerky.
Performance decreases with added complexity.
No true spatial freedom to move around and explore from novel angles and places. Absolute freedom of movement in any direction, at any distance, at any angle. Objects are VR representations that the user might wish to examine. They can be stationary or rotating depictions of the real objects. They are optional in a QuickTime VR scene, but add much to the illusion of virtual reality by giving users more freedom to explore their surroundings.