Really aggravating artifact
of poorly-designed 3D
systems. Due to the use of clipping planes
, only objects within a certain range of distances are rendered. So as you move towards a distant object, it will be invisible until the graphics subsystem decides that it's closer than the far
. Suddenly, it appears. (Pop
.) If you keep on going, getting closer and closer, many systems also have a near
, as well. A good example
is a race game where, as you drive down the course, bits of scenery
suddenly appear as you get close to them. The careful use of fog
will prevent this occurence, as will the design of sufficiently twisty
tracks, where you never see things which are that far away, because they're around a corner. This is also one reason why so many computer race courses have buildings/walls/trees/canyon walls/tubes around/along the track.
If Grover were to do the near and far demonstration on a cheap box, you might get pop-up, and the opposite, pop-down.