PR-Tf2 Perspective Midpoint of P1 and P2
Given two collinear points in a fixed order, P1 and P2, together with the vanishing point V of the perspective scale under consideration, these points determine a perspective scale from which the perspective midpoint can be derived.
PR-Tf2 is the transformation that maps the ordered pair (P1,P2), together with the vanishing point V, to the Perspective Midpoint M12 of P1 and P2.
Construction
The following figure illustrates the construction.
Properties
- M12 is the Harmonic Conjugate of V wrt (P1,P2)
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