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• # Straight line ease into Math.sin/cos

Posted by on March 21, 2024 at 2:13 pm

Consider the following position orbit expression:

My question, how can I have this layer start from comp center and smoothly move into it’s position in the orbit over the course of n frames, starting at the layer’s inPoint?

I think my biggest hang-up is that each layer that this expression is applied to has a slightly different position value at n time, and I’m unsure of how to grab the Math.sin/cos value at that specific time (if that’s even part of the method)

`oSpeed = thisComp.layer("orbitController").effect("orbitSpeed")("Slider");oWidth = thisComp.layer("orbitController").effect("orbitWidth")("Slider");oHeight = thisComp.layer("orbitController").effect("orbitHeight")("Slider");off = thisComp.layer("orbitController").effect("offset")("Slider");i = thisLayer.index;o = i*off;t = framesToTime(1)*o;x = Math.sin((time+t)*oSpeed)*oWidth;y = Math.cos((time+t)*oSpeed)*oHeight;[value[0]+x,thisComp.layer("orbitController").effect("yOrigin")("Slider")+y]`
3 Members · 3 Replies
• 3 Replies
• ### Dan Ebberts

March 21, 2024 at 3:05 pm

I think you could just replace the last line with something like this:

`p = [value[0]+x,thisComp.layer("orbitController").effect("yOrigin")("Slider")+y];n = 15; // ease framesease(time,inPoint,inPoint+framesToTime(n),[thisComp.width,thisComp.height]/2,p)`
• ### Shane Starnes

March 21, 2024 at 3:19 pm

Wow Dan. This is great, and works exactly as I need. Probably going to replace it with the handy expoOut function for a smoother animation. Either way, thank you Dan!

• ### Brie Clayton

March 22, 2024 at 2:56 am

Thanks for this solve, Dan!

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