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Activity Forums Adobe After Effects Expressions Pointers – re-making effect seen in Motion

  • Pointers – re-making effect seen in Motion

    Posted by Gareth Hanks on October 16, 2006 at 11:24 am

    I have seen this on the front page of Motion (top pic) & it would be perfect to adapt to a project I am currently working on. It’s the circle of Xs I refer too. I have some chevrons (bottom pic) that I wish to create in a similar fashion. My wish is to have a circle of chevons radiating out in a spiral & then having another line & camera following into the centre of. I have looked at mapping an AI sybmol in PP but the particle direction/gravity direction don’t seem to give me the result I want. The spiral you can see that I created in AI I pasted into the position of the cannon & I was then going to add an echo.

    I could take the AI file & just rotate it but I wanted something a little more dynamic. Any ideas what creates that effect in Motion. I’m not that familiar with that software.

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    Mylenium replied 19 years, 7 months ago 3 Members · 2 Replies
  • 2 Replies
  • Steve Roberts

    October 16, 2006 at 5:23 pm

    I can guess that you might be able to do something like that with the Particular plugin, with a custom “X” particle, and a rotating emitter, maybe. Then to get the gradient, you might create a ramp (radial), mess with it’s grayness using Curves, then use the X animation as a track matte over that.
    Or, in PP, you might be able to use a gradient to affect the scale property of the particles so they shrink as they go.

    But … it looks more like a creation of a 3D app to me, due to the size and brightness variation in the X’es. Since it’s a static template background (isn’t it?), the elements could have been created with anything, not necessarily Motion. Though it does have a useful 2D particle engine.

    Hope that helps (the Particular/PP tips).

  • Mylenium

    October 16, 2006 at 6:01 pm

    The simplest way would be to use expressions. Define a circle, then for each element add an increment in angle, so it forms a spiral and not a circle. Try the following code:

    angle=5; //basic angle between consecutive elements
    radius_base=50; //base radius
    radius_inc=20; //increment in radius

    X=thisComp.width*0.5+Math.sin(degreesToRadians(angle*index)*radius_base+radius_inc*index;
    Y=thisComp.height*0.5+Math.cos(degreesToRadians(angle*index)*radius_base+radius_inc*index;

    [X,Y]

    This will create the spiral in the middle of your comp. Apply the code to one element, then clone it as often as needed. Varying the values will give you any possible number of combinations. You can refine the look by using a similar incremental expression on the rotation:


    angle_base=5;
    angle_inc=1;

    angle=angle_base+angle_inc*index;

    [angle]

    Mylenium

    [Pour Myl

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