In the context of $3D$ computer graphics, which of the following statements is/are true?
$P$: Orthographic transformations keep parallel lines parallel.
$Q$: Orthographic transformations are affine transformations.
Select the correct answer from the options given below:
Orthographic transformation preserves parallelism.
So, parallel lines remain parallel after orthographic projection.
Therefore, statement $P$ is true.
Orthographic transformation is also an affine transformation because it preserves points, lines and parallelism.
Therefore, statement $Q$ is also true.
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