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How to rotate a mask shape without alter its scale?
AE 6.5, under WindowsXP.
The problem come up when i created a circular mask to use as path at Render/Audio Spectrum effect. I wanted to animate the mask rotation. I set a keyframe at Mask/Mask Shape and rotated the shape (by Ctrl+T)(free transform mask) to create another keyframe some seconds after the first one. The mask rotated, but its scale varied: it scaled down and then scaled up to the original aspect. How can i avoid it?
ps: it is not necessary to apply any effect to see the problem: if you animate the mask shape rotation, the scale will be animated too…
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5 Replies
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Put the mask on another layer, rotate the layer, use it as an alpha channel track matte.
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Yep, that’s the solution.
The explanation for that behaviour is that mask vertices travel in straight lines between keyframes. Take a look at a rotated mask and you will see.
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RobotHero and Steve Roberts : thanks for the attention.
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We went back and forth about this on the forum yesterday, and there is a “smart interpolate” for masks that keep them from following a linear tween. I really think the track matte solution is the best for most things, but it did remind me of a feature that I’ve never used in AE, and had some pretty interesting results that were nice and smooth, bezier like flows on the masks when I played with it.
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I’ll have to check that out, and see just how smart and interpolate can be.
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