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C
Coobit5C0F
Participant
March 23, 2021
Answered

Arched arrow with stationary origin but moving head. Help.

  • March 23, 2021
  • 4 replies
  • 3385 views

Hi, need help animating an arched arrow in adobe after effect. Here is an animation “draft” of what type of movement i need to create:

 

That is: The origin of the arrow stays static, but the arrow head moves along a path. And the arrow is not straight but curved just like in the linked video.

 

P.s. any linke to the youtube videos or articles would be appreciated. Thanks.

This topic has been closed for replies.
Correct answer P.M.B

What i want.
1. one end of the arrow (not the tip) is fixed always

2. the arrow shaft has an arch to it (that is it is not a straight arrow)

3. the tip of the arrow moves along some path (a line will do)

3. while arrowhead moves the arch does not flatten out but has its radius somewhat resized to make for a longer or shorter arrowshaft.


IDK... maybe it's just me but it seems you're describing like a sort of rope effect.

Also seems like you're REALLY overthinking things...even in the way you describe it. 

Unless you NEED the arrowshaft to adjust dynamically for some reason, I say why not just keyframe it by hand?

I mean do you need the shaft to behave dynamically in a way that perfectly accurate with real world physics or something?

If not just keyframe it.  It'll take two seconds

It's really minimal keyframing.  

4 replies

Mathias Moehl
Community Expert
Mathias MoehlCommunity Expert
Community Expert
March 24, 2021

You can create the arrow head with the Arrow Head iExpression. Then you can simply animate the path of the arrow itself with two simple shape keyframes. The expression will make sure that the arrow head follows the animation of your main path.

You can get iExpressions here: https://aescripts.com/iexpressions/

Mathias Möhl - Developer of tools like BeatEdit and Automation Blocks for Premiere Pro and After Effects
    ShiveringCactus
    Community Expert
    ShiveringCactusCommunity Expert
    Community Expert
    March 24, 2021

    I've done this before (will make a tutorial for it - eventually), try this:

    • Install the free FontAwesome font (https://fontawesome.com/)
    • Once installed, create a new text layer with the following text in the font awesome free solid font:

    ...................................................................................................................................................................................................................................

    • (That square is a Play symbol)  Set the kerning to -300 - so that all the dashes are connected
    • On your text layer, draw a curved, two point mask
    • In the text's Path options, set the path to Mask1.  I've added a screenshot for the other settings
    • Once that's all done, you can animate the mask's path and the text will follow it.

     

      Mylenium
      Mylenium
      Legend
      March 24, 2021

      That requires quite a bit of expression rigging, as you need to calculate the virtual center of the circle forming the arc, then clip it and use the expression to pin the arrowhead into place. I had such a project in my tech demo archive eons ago. Anyway, if you understand the math behind it it's easy enough to re-create...

       

      Mylenium

        C
        Coobit5C0FAuthor
        Participant
        March 24, 2021

        Is there a technical term to name this effect so I can search for it more efficiently? Like, path extrusion or smth like that?

        Mylenium
        Mylenium
        Legend
        March 24, 2021

        It's a simple three-point-circle. No fancy technical term for it. The distance between the two points is the secant and then you only need to define the radius as a third parameter in order to calculate the actual center point with Pythagoras' theorem. Of course it could be fancied up in all the ways. Wikipedia is your friend...

         

        Mylenium

        T
        Towerguy
        Participating Frequently
        March 23, 2021

        Hi. This should be what you're looking for:

        Animated Arrows in After Effects - YouTube

        C
        Coobit5C0FAuthor
        Participant
        March 24, 2021

        No it is not what I need. This video is about how to make an arraw (whole arrow) to move along a path. Internet is full of those examples. 

        I need to move only an arrow head along some path + I need to keep the arch of the arrow intact, that is arrow must have an arch all the way.

        P.M.B
        P.M.B
        Legend
        March 25, 2021

        Are you trying to say when the arrow head moves it's position you want the PATH to transform/stretch out? Like it were a string or a rope?

        ~Gutterfish
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