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Help In After Effects - Moving An Object Toward A Vanishing Point

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My friend and I are working on a project in After Effects that features a landscape scene that, when finished, will have a vehicle buzz in from off-screen. We have the keyframes for standard 2D movement down, but ideally, we want the vehicle to move in a diagonal line from off-screen toward the horizon. Naturally, the object needs to diminish in size and (if I'm correct) apparent speed as it approaches the vanishing point in order for it to look realistic. I have scoured google for tutorials for AE, but I've not been able to find anything on pulling off this effect. Maybe I'm not searching for the right keywords? I don't know. Any help, or even just a nudge in the right direction would be much appreciated. Thanks!
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You could just use an expression or do it the hard way and keyframe the movement and the scaling of the object.
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I assumed they already had a camera in shot and would either manually keyframe or use an expression to 'automate' the movement - or do it the really hard way in 2D and keyframe the position and scale of the object (or create a totally separate effect in AE and comp that back in.).

Really I'd do it in a real 3D package like Maya or Max and comp it back in, but from what I've seen of AE's capabilities it should work OK, but I also am not an expert in After Effects, I have only ever used it when clients specified it as a requirement.
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I'm really no expert in after effects, i've only been using it for about 4 months now, but you could try this:

add keyframes at your start and end point of your speeder animation. The first position keyframe will be the speeder offscreen . your last one will be at its destination. then create keyframes at the same points in the scale section, again first will be maximum size last will be minimum. Next highlight the keyframes in your "scale" section and click on the graph icon next to your timeline. now you can adjust the velocity of your keyframes animation. You want to slow the scale down as it hits the vanishing point so lower the velocity at the end. Most of this is trial and error to get it to look right so play about with things a bit. You could also right click on the last scale keyframe and select "keyframe assistant/ easy ease". this will do all this for you but its better to tweak the settings yourself until you get the desired result. once you have the animation settings you want then right click on the speeder layer in your timeline and select "switches/ motion blur". when adding this motion blur drag your last keyframes (which should be at the last frame of your animation sequence) for position and scale 1 fame after the last frame of the animation or the last frame ends up with no motion blur.

without playing about with the animation myself i can't be any more help with this but this should give you the basics

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