lately i’ve been having a lot of problems with Mecanim, mainly importing and root motion inaccuracies, so much so that it’s costing me sanity at this point…
So can some one explain to me pros and cons of Treadmill + Controller vs Root Motion?
Should i keep trying to make it work or just forget that feature ever existed?
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I liked root motion at first because of how natural animations can look with it, but it’s posed some problems in terms of configurability. If I have some nice mocap of a roll, for instance, and I want to adjust the length of the roll based on a stat variable like a character’s speed, then I’ll need a blend tree with additional animations to control the distance of the roll. Likewise, if I want a character to be flung back according to the force of an impact. Etc.
It’s doable, but compared to just moving a controller I feel like it’s more work.
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I would apply root motion for a game like a third person shooter. If you are doing a platformer or FPS, you need a really smooth control system so root motion wouldn’t fit (there would be a little lag between control and animation blending). I am doing a 2.5D arcadey platformer so I don’t use root motion at all. Depends on the game.
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Or you could use the animation target matching.
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I never use root motion, maybe their is a way to make it work well but considering the Unity Mechanim examples using it are completely unplayable I steer clear.
That’s a good idea. Out of curiosity, do you (or does anyone else) use it on a regular basis? I’ve had nothing but grief trying to get it to behave at all naturally: animations will begin to match, stop, then snap suddenly to their matched target, or become stuck in place after the method call, or behave unpredictably when interacting with obstacles. I simply gave up on it as a technique after trying to make it work in 4.0. Perhaps it’s been updated since.
Are you sure you were implementing it right? I can’t say I’ve used it extensively but its always behaved pretty much exactly as I expected. Here was a few hours of messing around:
That does look good; thanks for posting. I guess the matching is being used for the climbs and the jumps? My mistake is probably trying to use it as a more generalized movement solution (matching the root). Because MatchTarget only works within the context of a single animation clip, I found it rather untenable for controllers with layers and blending.
Overall root motion is very nice. But I personally had some issues with ledge climbing, as you need to position a character based on hand’s position, at the exact position of the ledge. But that was several versions ago, maybe some things have changed.
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The video doesn’t show it very well, but all of the moves are target matched (rolls will match length of obstacle, jumping down matches feet position, etc). I’m not sure it would work for an overall locomotion solution (kind of defeats the purpose of root motion if you are always programatically setting position).
But the main point is I didn’t really see any of those snaps or pops that you mention.
Again for a general locomotion system it might be quite different.
Root motion has always seemed incredibly cack handed to me. When you press forward, you want the character to go in a straight line, not an approximately straight line… Basic things like turning and moving sideways seem like they would be a total pain in the ass to get smooth.
I don’t have much experience with Mecanim’s root motion, but I had trouble turning precisely and making it work with the camera/controls style I want for my 3rd person shooter (sort of like GTA III and up I guess). So I just switched to a rigidbody char controller. It’s less realistic but works great for me. Maybe its harder without IK and other free version omitted animation features? I don’t know, I didn’t get into whats missing from Free much.
Mecanim rocks and I haven’t had the issues described above.
For a player controlled character it’s always a bit of a pain, yes. For NPCs it’s much simpler.
I’ve been using it to control players. It gives a great feeling of solidness or roundedness to your character and their motion. Yes, it’s a more costly way to do things in that it requires either an animator or something like Mixamo’s tools in your pipeline. Is it worth it? Depends on whether or not that matters to you.
I will agree that from a software design perspective it’s… odd… to have animation (a presentation role) and locomotion (an input/functionality role) bundled together like that, though. Not necessarily bad - it could actually make workflows and responsibilities better/cleaner - but odd.
I love Mecanim and find it really easy to use, and fun, and I do strive to have root motion for sheer realism, but for now sticking to addforce or rigidbody velocity to move till I’m a bit better at animating or making my char use root motion for turning like GTA IV char does (didnt play V yet). So far all my attempts resulted in incredibly in-precise turns with root motion. 
I’m glad this is being discussed here. I’ve considered making a thread about it in the past. It’s always seemed like an elephant in the room to me.
Does anyone know if things are done this way in any AAA games? Such as GTA for instance (because everyone keeps mentioning it)?
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I use Mecanim a lot but always without root motion, because all the control is lost with it. The steering is not anymore precise and if e.g. collisions happen the reaction if far too delayed as well.
GTA IV looks like root motion to me. There, Euphoria is used I think. But another popular game like Skyrim is so not root motion. And its pretty obvious that its not very realistic either. I like Skyrim way more tho, didn’t like GTAIV much, its not my type I guess. Regardless of root motion. xD
I found a little workaround, i would animate and import only root bone and than use layers to combine it with animation.
By the way can some one provide me detailed explanation on just how does Mecanim calculate/detect root motion and also center or mass, because im still having problems with some animations not previewing(preview window is blank)
I really wanna know what can i do on my end to reduce those errors.