One aspect that befuddles me often is units vs. pixels, image bounds,
cropping, core image filters, etc. For example, how can I use the
Perspective Transform patch so that the four corners stay in place as I
input them, and have a direct relationship to the dimensions of the viewer?
As in the attached comp, these basic concepts throw me.

Attachment: PerspectiveTransform.qtz
Description: Binary data

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