File:Perspective Transform Diagram.png

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Diagram of how perspective transform works in computer graphics

To determine which screen x coordinate corresponds to a point at Ax,Az multiply the point coordinates by:

${\displaystyle screen\ x\ coordinate\ (Bx)\ =\ model\ x\ coordinate\ (Ax)\times {\frac {distance\ from\ eye\ to\ screen\ (Bz)}{distance\ from\ eye\ to\ point\ (Az)}}}$

the same works for the screen y coordinate:

${\displaystyle screen\ y\ coordinate\ (By)\ =\ model\ y\ coordinate\ (Ay)\times {\frac {distance\ from\ eye\ to\ screen\ (Bz)}{distance\ from\ eye\ to\ point\ (Az)}}}$

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