Final #2 (Six Monocular Depth Cues)

Here is Atmospheric Perspective. I circled the sea-green blob on the floor in the distance as you cannot see the details of the scrub-clad medic, but the cop and the main character can be seen in much greater detail. They are therefor closer to 'the camera' then the person in green scrubs.

This is Linear Perspective. You can see the lines clearly from the rows of chairs and how the parallel lines look like they are closing in on each other in the distance. 

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Above pictures from Grand Theft Auto IV

TEXTURE DENSITY

In the game "Painkiller: Battle Out of Hell" here you can see that the texture on the ground gets more densely packed together and harder to differentiate the dark brown from the light brown. This cue makes the texture fuzzier, the farther back you look, making it look like it's in the distance. This is called Texture Density.

LIGHTING AND SHADING
From Fantasy Elves (PS) here we can see the use of the light on the girls' hips and the shadowing on the back wall to show us that these nurse elves are closer than the furniture in the background and the curtain and tile in the back wall!

OCCLUSION

Metal Gear Solid presents us with White Snake talking to Dr. Naomi Hunter here in this cut-scene. We know that the tank is behind them because their bodies are occluding the tank from the foreground of the picture. Therefore we know in this scene that they are in front of the tank.

SIZE DIFFERENCES

Taken from Dead or Alive 5, this fighting game shows different objects in the background of this level. We see that her shoe is about the same size as that bucket in the back middle. But in reality, her feet are probably much smaller and could fit several shoes into the bucket. We know that her foot is in front of these objects. Plus there is some help from the other cues like Occlusion and Atmospheric Perspective.  Ie. her other foot blocking the barrel/vase and the cement on the wall.

This is a selection of six monocular 3D depth cues from video games. They each help see depth and improve it's perception on a monocular level. It is a final exercise from the Immersive Education course that I am taking at Boston College. The course is called Discovering Computer Graphics. For details, visit the immersive BC portal at http://ImmersiveEducation.org/@/bc