![moving drop shadow after effects moving drop shadow after effects](https://i.ytimg.com/vi/1GsjOTePKnQ/maxresdefault.jpg)
TL DR copy and paste the above expression on the drop shadow effect’s direction property. By selecting the effect in your appearance menu, the drop shadow dialogue box will show up once again. Put it all together and you get this rather ugly looking thing: radiansToDegrees(Math.atan2(toCompVec(), toCompVec())) The appearance menu, or appearance panel, will now show up, and you will find the 'drop shadow' effect here: Appearance -> Drop Shadow. This is expressed in radians, so to make it useful for the drop-shadow direction control we use radiansToDegrees to turn it into degrees. If the vector you give it is the unit vector along the x axis of the layer (i.e the vector ) the result can be fed into the atan2 function to return the rotation of the layer in relation to the world. So it translates an arbitrary layer vector into comp space. What toCompVec does is to give you the composition equivalent for a given vector on your layer. That’s where the slightly mystifying toCompVec expression comes in. So we have to find their orientation in comp-space. But for layers that have parents or that are auto-oriented this won’t work. Simple enough, it compensates for the layer’s rotation by substracting it from the desired value. Normally to keep the drop shadow of a rotating element correctly aligned I use this on the direction property: value. Ci-dessous vous trouverez la correspondances du nom des effets de l’anglais vers le français dans after-effects. Make the layer 3d, add a camera, move anchor point to the bottom and rotate on x. Instant crowd scene!īut I want them to have a drop shadow. Quand vous regardez une vidéo ou un tuto After-effects en anglais, il est parfois difficile de trouver la correspondance du nom des effets de l’anglais vers le français. Another quick and dirty way of doing a shadow (with perspective distortion) is to duplicate the layer, use Levels to make it all black, add a Fast Blur to feather edges and a mask with lots of feathering to cut the top of the layer and make the shadow fade. Keep transitions and animations to only transform and opacity, and you’re certain to achieve the best possible performance, and with that, the best possible user experience.I have some background elements that I want to wander around, and because I’m lazy I don’t want to hand animate them, so they just have a wiggle expression applied to their position channel and auto-orient switched on. Why bother?Įven if your desktop likely handles animating box-shadow without any issues, your phone may not, and even your desktop may start to stutter when animating a more complex layout. That’s certainly a lot of CSS to achieve the same effect as simply animating box-shadow, just with improved performance. This is the critical difference between the two techniques, stripping out all of the other layout styles: We minimize the amount of repaints (and work that your browser has to do) by sticking to only changing these two properties during the animation. Why are we seeing this effect? There are very few CSS properties that can be animated without constantly triggering repaints for every frame, namely opacity and transform. There are clearly more re-paints when hovering the cards on the left side (animating box-shadow), compared to hovering the cards on the right side (which animate the opacity of their pseudo-element). If you bring up your developer tools and hover one of these items, you should see something similar to this (green bars are paints less is better): On the left we’re animating box-shadow on hover, and on the right we’re adding a pseudo-element with :after, applying the shadow to that, and animating the opacity of that element.
![moving drop shadow after effects moving drop shadow after effects](https://i.ytimg.com/vi/QTaOzsAzDQQ/hqdefault.jpg)
The only difference is how we apply and animate the shadow. If the camera is not moving, the easiest thing to do is to find a frame where there is no shadow, duplicate the layer, use the Layer/Time/Freeze Frame menu to create a clean frame on the top copy of the layer, then add a mask so the action can continue below the repaired section of wall. If the two examples look the same to you, that’s the point. This gives the effect of the colours in the image being mixed, and it’s very useful for colour correction too. Channel blur creates a blurring effect for the red, green, blue and alpha channels within a layer.
![moving drop shadow after effects moving drop shadow after effects](https://s3.amazonaws.com/pbblogassets/uploads/2013/10/3dshadow.jpg)
Have a look at the demo and compare the two different techniques we’ll be exploring. Let us help by helping you get familiar with the five basic types of blur you can experiment with on After Effects 1. There’s an easy way of mimicking the same effect, however, with minimal re-paints, that should let your animations run at a solid 60 FPS: animate the opacity of a pseudo-element. Animating a change of box-shadow will hurt performance. How do you animate the box-shadow property in CSS without causing re-paints on every frame, and heavily impacting the performance of your page? Short answer: you don’t.