Diagram
To determine which screen x-coordinate corresponds to a point at multiply the point coordinates by:
where
- is the screen x coordinate
- is the model x coordinate
- is the focal length—the axial distance from the camera center to the image plane
- is the subject distance.
Because the camera is in 3D, the same works for the screen y-coordinate, substituting y for x in the above diagram and equation.
Read more about this topic: 3D Projection
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