BlendSpace keyframe "bouncing"..?

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carterlilley

Hey all.

Having an issue here that I can't find any documentation on. I am attempting to build a procedural animation system like this infamous GDC talk - where you blend key poses of animations based on a number of factors (namely, velocity). There's an amazing Youtube series of someone building the bones of a similar system in Godot here.

I've split my animation up into 4 seperate keyframes, two reach, and two pass poses. When playing the animation in my 3D software or as a "single" animation, it looks fine - but when using a blendspace to blend between seperate animations containing one keyframe each, I get this really strange "bouncing" on all positions.

You can see here the center of mass is all wrong, especially when looking at the head of the character.

Here, you can see the clear "arcs" its taking between keyframes.

As far as I can tell, it is not scaling issue - I have import scale set appropriately and the actual transforms are untouched.

I have been banging my head against this and I'm absolutely at a loss. Anyone have any ideas??!

Calinou

This is a known issue: https://github.com/godotengine/godot/issues/23414

carterlilley

Well, this is certainly got me much closer to an answer than I was before - much appreciated! I'm a little unclear by reading this thread what the cause and workaround for this are - is it to do with having animations of different lengths? Because each of my animations are exactly 1 keyframe each. (0.001s) This thread appears to be about doing synchronized blends between two animation loops - I'm trying to blend between two static keyframes.

Is the current best workaround proposed here to do it programmatically with node seek instead?

Thank you again, I finally feel like I've at least made some progress. This has been a brick wall for me.

carterlilley

Bump!

Calinou

@carterlilley Please don't bump threads if you haven't gotten a reply – it hasn't even been a day since your last reply :)

I don't know how to resolve this issue, as I have no experience using AnimationTree myself.

carterlilley

@Calinou my apologies - thought this had been marked as 'answered', so I wanted to be certain it wasn't!

I asked a few questions above that need clarifying -

The known issue linked above involves synchronous blending between two blend spaces. I am not attempting to do this. I am trying to use a single blend space as is intended - to blend between multiple animations (each of which is a single keyframe). These are not the same issue, right?

The reason given in the thread above is a lack of synchronized blending between animations in blend spaces of different lengths. Again - all my animations are the same length - one keyframe.

I'll give an attempt to resolve this programmatically - though I don't understand how this isn't a gigantic flaw for all 3D pipelines in Godot? Blending between animations just...doesn't work?

EDIT:

I did a bit more digging and it would seem this issue is related to #34134 and not #23414 - would I be correct in that assessment? Seems the two major issues are synchronized blends between animations - but as well major inconsistencies when blending animation at all.

Calinou

Blending between animations just...doesn't work?

See https://github.com/godotengine/godot/issues/37661.

carterlilley

Definitely a lot of useful stuff in there, and I appreciate the response, I'll see if I can use some of that...but again - this isn't what I am doing. I'm not using Add2 nor doing a synchronized blend. I'm just using a single blendspace as intended with two keyframes. I asked above is this could be #34134?