If you have a 2d display lets say a (100×100) pixels and you wanted to graph a 3d point(10, 10, 10). Where would it go? How would the 2d (x,y) be formed from the (x,y,z) value?
You use something to indicate the position on Z-axis, just like relief is represented on maps: high mountain peaks are white, deep water is dark blue etc.
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