force keyframes to interpolate only every other frame

[Vympel]

The hold interpolation don´t work to this case??

[Mylenium]

yepp, simple hold keyframes will be the way to go. You could cobble up some expressions, but it would be pretty complex for such a simple task.

Mylenium

[payton]

hold keyframes wont do the trick.

lets say i wanna scale a layer up from 1% at frame 1 to 100% at frame 100. with hold keyframes i need to set 50 keyframes. but what i want to do is setting keys on 1 and 100 and let after effects interpolate on 2´s the whole range. yes, i know that it is possible with pre-composing. but i thought there will be a simple way to fix it. if not - i need to precompose anyway...


payton



for those who are interested in:
why pre-composing isn´t the first choice - i have a lot of layers, all with different timings. some layers are animated on 2´s some on 3´s and a few one on 1´s. some layers change this behaviour in the middle of the comp (dont ask me why. im not the director who wrote the dopesheets ;)). if i need to precompose every single layer, changes in animation and timinig are getting pretty time consuming after that.

[Mylenium]

Try this:

my_step=25/3; //comp's framerate divided by step
posterizeTime(my_step);

my_time=timeToFrames();

my_start=timeToFrames(key(1).time); //time of first keyframe
my_end=timeToFrames(key(2).time); //time for second keyframe
my_start_value=valueAtTime(my_start)[0];
my_end_value=valueAtTime(my_end)[0];

my_value=linear(my_time,my_start,my_end,my_start_value,my_end_value);

[my_value,my_value]

Mylenium

[payton]

hi mylenium,
im sorry that im answering so late, but i didn´t got a mail-notification of your reply. dont know why. never happened before.

this works just perfect! thank you so much. this will save me lots of time and give me much more flexibility. i think i need to re-read this expression a few times to understand whats really going on under the hood. but for now im just glad to just use it as is :)

thx again,
payton

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