Rotate + time extra

Thats just for making it to rotate over time from 0 and in timeline 0

-time*1.3

This if for makeing it start from a value and then adding a time offset

(value-time*1.3)

Getting world space coordinates - Comp space - Comp Coordinate

Lets call this one.... Beam Glue

Have been looking for this Expression for a long time, but finaly i found it.
This one is for linking stuff together, that is allready parented fx Beam Between 2 Nulls

//2d
//Video copilote
//ngambles

lay = (pickwhip the child null layer) ;
pos = lay.toWorld( lay.anchorPoint);

And another one (with extra control)


//2d
//Mograph.net
//iline

lay = thisComp.layer("Parent NULL")
wrld=lay.toWorld(lay.anchorPoint);
[wrld[0],wrld[1]]



//3D
//Dan Ebberts

L = thisComp.layer("Solid 1");
P = L.toWorld(L.anchorPoint);
Where P[0] =x,P[1] =y, and P[2] =z

Broken Zip file on OSX

Have a broken ZIP on you mac OSX system. Try Terminal, and fix it.

http://mac.tutsplus.com/tutorials/terminal/how-to-repair-damaged-zip-files-with-terminal/

Thanks Robert Anthony.

One-sided layers

//found on :http://www.mographwiki.net/After_Effects_expressions_library

Apply this expression to the opacity attribute and it'll disappear 
whenever it's flipped away from the camera. You need to have an active 
camera in your composition for this one to work.
 

a = toWorldVec([0,0,1]);
b = thisComp.activeCamera.position - toWorld(anchorPoint);
c = dot(a,b)/length(b);
if (c > 0) 0 else value

Bouncy Scale In

 //found on : http://www.mographwiki.net/After_Effects_expressions_library

Apply this expression to the 'scale' parameter of your layer.

k=100; // final scale
a=5; // how quickly the bounce ends
b=20; // how many bounces it'll do (that is, the bounce speed)
x=k*(1-Math.exp(-a*time)*Math.cos(b*time));
[x,x]