framer is a mousetool used to very quickly change renderheight and -width. This is great for rendering regions or single objects of your scene, similar to a blowup render, but with variable aspect ratio. When dragging the frame, the aspect ratio changes interactively in the viewport.

Short explanatory video here:

framer MAXScript from br0t on Vimeo.

framer @ Scriptspot

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If you use this script, be awesome and donate a few bucks!