How do I undo an accidental vertex added to an ellipse causing it to become a polygon.

Question

I often create an elipse mask to track and blur faces in a video. I often have to manually adjust the shape of the elipse from frame to frame and sometimes I accidentally click on the line of the elipse instead of one of the four vertex points and inadvertantly add a new vertex point with bezier handles turning the elipse into a polygonal shape. I UNDO the action which fixes the ellipse on that frame but I then discover that all the preceding frames have converted the elipses to polygons with the extra verytex making it impossible to adjust the shape as a constrained elipse.

SO, my questions - 1. How can I UNDO the mistake of accidentally converting the shape to a polygon so that it reverts all the ellipses on preceding frames as well? 2. How can I remove an added vertex point so that the shae becomes a constrained ellipse again? 3. How do I stop the cursor from automatically adding a new vertex when I accidentally click in the wrong spot on the ellipse?

R Neil Haugen · Answer

I understand your problem better, I think. Stepping back via Ctrl/Cmd-Z can undo changes so you're back to the original ellipse shape, and on my rig does so completely. I can have the original ellipse just by going back.

And adding any control points does change the nature of the shape controls. You can still do a Shift-click just outside any vertex to resize the whole shape, but you can't simply grab one and have the "smooth" changes across the ellipse as you drag.

Once you've got a polygon, basically ... you need to click-drag a bounding box over multiple vertexes to move them at the same time and direction. But it ain't "proportional", they'll all move the same amount.

Neil

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