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Just the Tip (a new set of mini-tutorials for After Effects) - Rolling a ball using Expressions

I'm currently prepping a much larger series of tutorials, but to take a break from those, I've also be creating a series of short tutorials for the things I go back to again and again - but not so frequently that I have them memorised. I find myself searching the internet (and the Cow of course) for these tips, but then often have to wade through a 30 minute tutorial - just to find that one thing... that one trick. Well, these mini-tuts are built for that purpose. I hope you find them useful.

This tutorial uses an expression to calculate how much a circle / image should rotate based on its horizontal position. I've then adapted the expression slightly to help you roll 3D objects too.




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Expressions:

2D Layer
diameter=width;
pi=Math.PI;
circumference=diameter*pi;
rot=360/circumference;
Xpos=thisLayer.transform.position[0];
scalePercent=thisLayer.transform.scale[0]/100;
rot*Xpos/scalePercent


CC Sphere in one dimension:
diameter=effect("CC Sphere")("Radius")
pi=Math.PI;
circumference=diameter*pi;
rot=360/circumference;
Xpos=thisLayer.transform.position[0];
scalePercent=thisLayer.transform.scale[0]/100;
rot*Xpos/scalePercent


CC Sphere coming towards camera:
diameter=effect("CC Sphere")("Radius")
pi=Math.PI;
circumference=diameter*pi;
rot=360/circumference;
Xpos=thisLayer.transform.position[0];
scalePercent=thisLayer.transform.scale[0]/100;
rot*Xpos/scalePercent*-1

Project file: http://bit.ly/2ZtSDn6

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Twitter: https://twitter.com/ShiveringC


Posted by: Graham Quince on Oct 12, 2019 at 3:39:27 pm after effects, expressions, rolling, roll, rotate

After Effects tutorial: Converting a 2D effect to 3D (using a bit of Maths) to make a Black Hole

Long title, but it about covers it. In this tutorial, I'm demonstrating how to get the look of an Interstellar Movie-type Black Hole using the Bulge effect, 3D layers, adjustment layers and how to use expressions to compensate for the fact you can't use Bulge in 3D space.

I've included the project file here:
http://www.mediafire.com/file/vpycnod1bn97la5/Black%20Hole%20Tutorial.aep

Other tutorials mentioned:
CC Particle Galaxy tutorial
https://library.creativecow.net/quince_graham/adobe_after_effects_particle_...

Cinema 4D Black Hole
https://shiveringcactus.wordpress.com/2015/07/19/interstellars-black-hole-r...


Posted by: Graham Quince on May 26, 2018 at 4:00:59 pm after effects, space, expressions



Here you'll find a bunch of tutorials for using After Effects (mainly). I have a YouTube channel, called ShiveringCactus (long story - not funny anymore) where I post the videos.
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