Look At Interpolation

Development Character & Animation
1

Hey! I’ve been trying to figure out how to fix this bug. Let’s say I’m not an expert in animation programming.

I have a bone on my character that should always be aiming toward where the mouse is. I calculate the position every animation update and force the bone rotation using this:

UE4EditorWin64DebugGame_20190406_185515.jpg
UE4EditorWin64DebugGame_20190406_185515.jpg1866×1080 350 KB

However, my character can turn around. When he is in the process of turning, the hand does not stick to the target. Here is a video of the problem. The red sphere is the target (Hand Look At) as recorded by the animation blueprint. The red line is the forward vector of the bone.
https://puu.sh/Db2ZF/655aaab92d.mp4

I’m fairly sure it is tied to interpolation, but the interpolation time value of the look at is set to 0. Should I disable something else?
I guess I find it weird because I figured the interpolation would be done in the blend space and the modified hand position would be set after.
Thanks for your help!

2

I might have found something. Maybe the animation rate is not the same as the normal game tick rate (where the character is turned). Will investigate.

3

It seems that is what the problem is. How would you go about forcing the anim graph to run at the same tick rate as the main game/ every frame?

4

I found out the solution, the anim graph was ticking before everything else so I was moving the bone, then moving the character, misaligning the bone. By setting the specific mesh tied to the anim into another tick group after the actor’s one, it worked!

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