Hey guys, sorry to revive this but the expression is really great. I'm trying to use it for the z-axis and so far it worked the only thing I'm stuck with is how to create only positive values for the amplitude. Any idea on how to do this?

ericsten

Inspiring

Sorry for the late response.

One way to achieve this is by adding Math.abs() to your expression which will return the absolute values instead of true values (aka negative numbers get switched to positive).

Z=Math.abs(amp*Math.sin(time*freq*Math.PI*2));

- Eric

Dan Ebberts

Community Expert

Try this:

amp = 100;

freq = 1;

y = amp*Math.sin(time*freq*Math.PI*2);

value + [0,y,0]

Dan

A

AaronJ6

Participating Frequently

Hey Dan I am kind of new to after effects and I understand expressions but I honestly not sure where you post these lines. Can you help out? Would be much appreciated.

A

AaronJ6

Participating Frequently

try subbing this for the last line of Dan's expression.

t=time; // Comp Time //

StartTime=2; // time in seconds | change this to when you want it to start //

if (t < StartTime) value else (value + [x,0,0])

so that the end result is:

amp = 100;

freq = 1;

x = amp*Math.sin(time*freq*Math.PI*2);

t=time; // Comp Time //

StartTime=2; // time in seconds | change this to when you want it to start //

if (t < StartTime) value else (value + [x,0,0])

Thanks a ton for the help! How do I format the time that I need to enter? I'm still new to expressions.

This is what my expression lines look like but it starts at the beginning still.

amp = 15;

freq = 1;

y = amp*Math.sin(time*freq*Math.PI*2);

t=time; // Comp Time //

StartTime=2; // 07:45 //

if (t < StartTime) value else (value + [0,y,0])

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