Linear() needs 3 or 5 arguments error

[davidb16982949]

Hello everyone, 

First time posting. I borrowed this expression from another post and it works if I am only using 2 keyframes, but when I try to adjust the expression to include 4 keyframes so it can animate out, it breaks.

I am basically trying to animate opacity keyframes using a slider. 0% to slider value to slider value to 0%.

I posted a screenshot of my comp and the expression (with error)

Thanks for the help!

[Dan Ebberts]

This should work:

t1 = key(1).time;
t2 = key(2).time;
t3 = key(3).time;
t4 = key(4).time;
v1 = key(1).value;
v2 = thisComp.layer("Controls").effect("Background Transparency")("Slider");
v3 = thisComp.layer("Controls").effect("Background Transparency")("Slider");
v4 = 0;
if (time < t2)
  linear(time,t1,t2,v1,v2)
else if (time < t3)
  linear(time,t2,t3,v2,v3)
else
  linear(time,t3,t4,v3,v4);

[davidb16982949]

Awesome, thanks so much!
______________________________
David Brammell Jr
Teacher
AV Production/Animation
Robert Turner College & Career High School/Pearland ISD
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