![]() Here is a Quake screen shot where I have highlighted the main vanishing point. Your brain assumes that the road, the fence, and the lights are all uniform in size, so it interprets the narrowing of them towards the center of the picture as an effect of distance. You probably did pictures like these at school. This point is called a vanishing point and is labeled "vp" on the drawing. The lines on the road fill more of your field of view closer to you and grow narrower and narrower until they reach a single point in the distance. Your brain is confused because it can interpret the above image in two different ways: There is one very large monitor behind a much smaller monitor that is closer to you or, there are still two monitors of the same size but they are hanging from the ceiling, or the larger one is floating in the air in front of us. We now see that the image doesn't look right. Now if we do something to break these assumptions by changing the assumed viewing angle. Second, we assume that they are standing the right way up, and not upside down, and that they are being viewed from above. The above example causes our brain to make a couple of assumptions: First, we assume that both monitors are the same size. This example works well because we have two instances of the same object, which your brain assumes are the same size. As shown below, one monitor looks closer than the other because it is larger. This particularly applies if you have two of the same object. The more field of view that an object takes up, the closer it is. I will cover the secondary depth cues first as these are ones already commonly used in games and in the movies.Īs a very general and often inaccurate rule, larger objects are closer. There are primary and secondary depth cues, or indicators, that the human visual system uses. By depth I am referring to how far away an object is perceived. In order to understand how current 3D imagery methods work, and why they are limited, it is important to have some basic knowledge of how the human visual system perceives depth.
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