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How to make a tennis ball draw its trajectory?

New Here ,
Jan 01, 2017 Jan 01, 2017

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So I've got this physics video project in which I would like to show the difference between flat and topspin shots thanks to the Magnus effect. My idea is to make the tennis ball draw its trajectory so the difference can be clearly seen, but I'm new to AE and the best I have acheived is the end of a beam following the ball (looks like this):

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I used this tutorial to do it: How to make the end of a line follow an object (Adobe After Effects animation) - YouTube

Could someone explain step by step (if it isn't much trouble) how to do it? Instead of a straight line I'd like the ball to draw a curved trajectory that remains where it was drawn.

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correct answers 1 Correct answer

LEGEND , Jan 01, 2017 Jan 01, 2017

Instead of beam effect, use write-on effect.

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LEGEND ,
Jan 01, 2017 Jan 01, 2017

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Instead of beam effect, use write-on effect.

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New Here ,
Jan 02, 2017 Jan 02, 2017

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Thank you so much! Works perfectly!

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New Here ,
Aug 14, 2023 Aug 14, 2023

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Hello! I am trying to do what you are doing but in terms of a tennis serve. Could you possibly guide me how to do what you did. I saw the youtube video, but it seems like you have made some adjustments. 

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Community Expert ,
Aug 14, 2023 Aug 14, 2023

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I would work this problem a little differently. It only takes a copy and paste plus setting the position value to 0, 0 to accurately turn any motion path created by keyframes into a shape layer path. Add Trim Paths, and you have your path traces the ball's path composition. 

 

Here's a new tutorial I just made.

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New Here ,
Aug 14, 2023 Aug 14, 2023

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Thank you so much for this video!

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