WAIT!!! I'm not done yet!!! I've not covered Scaling yet and I should add clarity that {Ap+Pos)/2 applies for X and Y, separately — as in the first two examples I showed you earlier. Scaling makes things more complicated since it affects the edges of the layer and the edges may be placed such that they mimic the case where (Ap + Pos)/2 is not an integer. For this, set the AnchorPoint of the 400x400 rectangle, Shape Layer to the center of your Shape Layer - ALT+CTRL+HOME. Then set the Shape Layer to the center of the Comp - CTRL+HOME. Dive into your Shape Layer's Transform properties (not to be confused with Layer>Transforms) and zero in the AnchorPoint and Position properties. Now, twirl all the properties up and display only Layer>Transforms for Scale, AnchorPoint and Position. Scale up and down to your heart's content, without adjusting AnchorPoint or Position and you'll notice that the the edges stay sharp regardless of the scale value for as long as the Scale value is made up of integers. If you put in a number such as 22.1%, a non-integer then the edge softness occurs. To experiment further, to obtain a deeper understanding, set Scale to [100,100]. Change Position's value to [900,500]Then adjust Scale to different integer values. You should see no difference here. The moral of the story is in understanding layer resampling in AE and that scaling is not the real cause of such issues since scaling can result in crisp edges as long as the Ap and Pos formula is adhered to. Further, a Shape Layers, internal Transform>AnchorPoint and Position values are also calculated in determing the Ap and Pos formula. And if you misspell my name again, for the thirds time in a row, I will hound you in your nightmares tonight!!! 😉
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