Additive animations not working

Hey Guys,

I'm currently trying to add additive animations to my character. I've two animations:

1. Idle (Base Layer)
2. Hold weapon (Additive layer)

So from my understanding, as soon I set the weight of the additive layer to 1 the character should play the idle with the hold weapon animation, but instead my character still idles without holding the weapon.

Is there any special trick to create additive animations?

I'm using Unity 5.3.

 

I'm not sure why exactly are you trying to use an "Additive" layer, I usually use an "Override" layer for that, have you tried it already?

 

Override is working fine, but it doesn't look good when my character is running (the arms are too steady).

 

Hi Mecanim-Dev =D

Why is the Additive Reference Pose Clip setting not easily accessible for clips created within Unity?

If I hadn't found this thread I would have continued to think the additive feature in Mechanim was broken.

For those struggling with this you can additionally set your editor to debug mode to expose the settings when you have an animation clip selected. Don't forget to set the Has Additive Reference Pose bool as well as setting the Additive Reference Pose Clip otherwise it wont work.

 

Trying to do exactly this; I have an animation (let's call it "happy", frames 40 to 64) that differs significantly from idle, both clips from a single asset, and have the pose frame for happy set to the first idle frame (and additive reference pose flagged on obviously).
Unity would have to take happy and substract that idle pose to get the additive difference, right?
And if if I then play happy as additive onto idle, I should get my full happy animation, right?

But it doesn't; it seems to just take the first frame of happy as a reference pose, and creates an additive clip based purely on that pose (which is some minimal jitter currently) that gets added onto my idle.
I would say the result is quite sad instead...
Am I missing something here?

 

Actually, exerions tip for using debug mode revealed the issue; regardless of what frame is set as a reference pose, the importer will make use of a 'preview' clip based on the clip used as additive animation. Any frame lookup will be done relative to this preview clip. Unfortunately, these additive reference pose clips cannot be set in the animation clips of an asset. The only way to work around this bug is to duplicate these clips to stand-alone assets, and then set the reference pose clip to an idle animation (or whatever animation is to serve as a basis). The downside here is that updating the original asset will not update these duplicate clips.

 

lol lose 2 hours before finding this thread. Additional clarification since this came up the top from Google, important rule :

https://docs.unity3d.com/ScriptReference/AnimationUtility.SetAdditiveReferencePose.html

Without entering Debug mode, if we have an additive layer with full weight, both base layer and additive layer playing single state



Situation 1

Base layer : single keyframe, looping, position x = 5
Additive layer : single keyframe, looping, position x = 1

Expected : constant position x = 6
Result : constant position x = 5, because the additive layer reference the first frame of itself, which has position x = 1. When it is playing, it is always 1 - 1 = 0 so nothing got added.

Situation 2

Base layer : single keyframe, looping, position x = 5
Additive layer : 2 keyframes, looping, position linearly ramp up from x = 0 to x = 1

Result : position ramp up from x = 5 to x = 6. Additive layer use the first frame of itself as a reference like before but this time it's x = 0. Overtime we get +0 ~ +1 to the base layer correctly. You can also adjust the total addition with Additive layer's weight.

Situation 3

I want to upgrade the ramp, so I made the 2 keyframes that was ramping up from x = 0 to x = 1 to become x = 3 to x = 4 instead.

Expected : position ramp up from x = 8 to x = 9
Result : position still ramp up from x = 5 to x = 6. Again, since the additive clip use the first frame of itself as a reference, we get 3 - 3 = 0 ~ 4 -3 = 1 -> still ramping up from +0 ~ +1

How to make the first situation producing constant x = 6, and the 3rd situation producing ramping up x = 8 to x = 9?

Make a custom reference clip. It doesn't have to be in the graph, but you should copy from your previous clip so it has a Position keyframe. (If it is not in a graph, you cannot key a new kind of keyframe to it from "nothing", but you could delete keyframes) Make it a single keyframe with 0 0 0 position.



Enter debug mode of the additive clip with a single keyframe position x = 1. Connect the zero reference clip and check has additive reference pose check box. Now x = 1 will be 1 - 0 = 1 correctly and not 1 - 1 = 0, and produce a constant x = 5 + 1 = 6 when playing additively.



(imo this box should be exposed, especially that I am doing UI animation where there is a lot of single frame animation that I want them added it is not obvious that I have to enter Debug mode.)

 

I agree that this should be exposed. And thank you so much for this post! I've been trying to get additive blending to work properly and couldn't until I got here. I found a lot of "use override" posts, which really don't do the trick.

Thanks again!

 

Same here - this has been an issue in the past and the solution was usually awkward. Very happy to see an updated thread and have stumbled on this

 

Hard to believe they couldn't fathom that people would import/create pose clips for additive poses. Not hard to believe that they would neglect fixing it for this long. I hope people are happy with their Machine Learning and DOTS toys, because the tools are rotting.

Thanks for the workaround.

 

Sorry to bring this up again, but it ties into this and others may have the same thought/issue...

What happens if my animation on an additive layer is a loop that doesn't 'overlap' the reference animation position/animation? If I 'NEED' an additive reference pose frame (say, frame one) but my character needs to be positioned away from the position of the base animation and is a loop...how do I create a reference pose for a loop without having a single frame look like it's glitching because I HAVE to have a reference frame so it knows what to blend from?

I hope that makes sense?

 

I know this is very late but to do this I:

1. Set the anim's reference pose frame in it's import settings (for my looping pose)
2. Duplicated the looping pose
3. Went into debug mode with the duplicated anim selected like in the above example
4. Chucked my idle animation in as the 'Additive Reference Pose Clip'
5. Put my duplicated anim into my animation controller

And it was job done.

It's an absolutely garbage process though, and it's embarrassing to see that it's been like this for half a decade!

 

How do you edit the clip? I enter debug mode but all fields are locked!

 

Yeah that's the annoying part: you have to make a copy of the clip (ctrl+D), so it becomes a stand-alone asset. Only then can you assign it a reference pose clip.

 

Is this still the way to do additive layer animations in 2022? Having to go into the debug inspector is so clunky.

 

This is absolutely nuts. It's 2023, why can't we just drag another FBX into here to set this up.

 

It's just the Unity's way. Double down on the new shiny buzzword (yeah, they announced Unity AI, whatever that means.) and let the engine die.