ContourBlur is a Blinkscript-driven gizmo that allows you to blur an image based on a set of vectors. This is especially useful for blurring surface-dependent features on CG.
You can download the gizmo here!
You can check out Bygone here!
Learn more about Transformation Matrices here!
Interested in learning Blinkscript yourself? Checkout An Artist's Guide to Blinkscript