Mystery Movement between keyframes

Deke

Am I the only animator using Keymate with this problem?  There is odd movement between two keyframes. I may even delete the latter keyframe, copy the first one, paste it down the timeline...and there is still some movement in the item. The identical keyframes should result in no movement but there is still movement. I've noticed there may be ghost keyframes still in the timeline pay. Sometimes erasing those will take care of the problem. But not always. I think this may have something to do with an automated easing the program does. Any ideas?  My only fix has been to repeated paste in the copied keyframe, but that is pretty tedious.

Sven Dullah

Deke said:

Am I the only animator using Keymate with this problem?  There is odd movement between two keyframes. I may even delete the latter keyframe, copy the first one, paste it down the timeline...and there is still some movement in the item. The identical keyframes should result in no movement but there is still movement. I've noticed there may be ghost keyframes still in the timeline pay. Sometimes erasing those will take care of the problem. But not always. I think this may have something to do with an automated easing the program does. Any ideas?  My only fix has been to repeated paste in the copied keyframe, but that is pretty tedious.

Yup it's a result of the default ease in ease out interpolation. How much it "overshoots" depends on what's happening before these two identical keys. The more of a difference the more it will ovrshoot. Setting the first of the identical keys to constant (or linear) should fix the problem. And if you own graphmate you'll have access to some other options for tweaking the key, like tension, bias and so on, to prevent this thing from happening. Graphmate also provides a graphical representation of the curve so you can see exactly where things go wrong.