[#03] Unity Animation Rigging - Attaching a weapon using two bone IK constraint 

Thank you broo i love you

There is also one more Caveat I forgot to mention - If you have Use Root Motion selected on your character, then press the preview button or the play animation button, your character will snap to it's parents world position. I have a Player System object and under this I have the model, my Player System object was located at the world origin, but the character was not. When I was Root Motion in the animator controller, it would snap my model to that location - so if you're gonna use root motion, be sure to either turn it off when you are doing your IK adjustments, OR make sure that your animated model is at the same location as it's parent. You're welcome. 8)

And hey, Kiwi coder - excellent work brother.

Great to hear!

Awesome! There’s another built in Ik system too you can use as an alternative to this.

mine still aint working :(

Thanks

Thanks

F* Legend! Thanks

def

Thanks for the kind words :) Cinemachine & Animation rigging is a great combo. I'm yet to checkout the new input system or dots tho

Muchas gracias

Is only needed if the gun is a child of a character

@@dftpunk Thank you so much I don't know why but if I put a rig transform on my gun I cannot change any of the guns transform values which is exactly why I need it to aim the gun up and down. I spent at least an hour trying to solve this and saw your comment and just unchilded the gun. Didn't fix the rig transform not working but it gave me a work around.

No probs! I’m interested, what was your solution?

@@TheKiwiCoder I had references under Rig hierarchy for both the handle (meant for R_hand ) and the barrel (meant for L_hand ) of the gun. Then I used m_parent constraint to hook the handle to stick with the right hand ik. But then I ran into a problem because the same trick wouldn't work for the left hand and the same time. So I hooked the left hand to stick with the ref_barrel by using again multi_parent. So in the end the constraint hierarchy was something like this from the top: right_hand_ik => gun regerences => left_hand_ik where r hand ik naturally controlled the movement. And well it worked but I still had some trouble with the gun's orientation :D

Lightkitara Interesting idea to use the right hand to control the gun! I made the hand IK references children of the weapon to make switching weapons a bit easier.. that was the idea anyway. Whenever I get orientation issues I double check the ‘Maintain offset’ parameters on the constraint. The position and rotation constraints can be used in place of the parent constraint, giving you separate control over each. They let you specify offsets too.

Thank you!

Thank you! Awesome it worked for you :)

Hey, what adjustments did you have to make to get the Mixamo model to work? Thanks

I also have a Mixamo model but how did you make it work?

@Shamshad Jaweed ya, same here, but do you got a fix, because we can't always use the polygon pack ¯\_(ツ)_/¯

@Shamshad Jaweed how bro?🙏🤔 wait I think, that my gun pivot is making some weird movements, don't you think it will affect the character?

Yes it was!

Checkout my follow up video to this one! ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-ajmp3J7N3Ow.html

Yes

Remember that animation states can also animate the properties of the rig, such as weights. It would be a mix of this and scripts to swap out the weapon and control targets. The easiest method I’ve found for authoring is defining the ik targets in the weapon prefab.

@@TheKiwiCoder Hi, yeah i was thinking of the same method, reference the ik nodes in each weapon prefabs script. Im currently making a GTA style game, but so far havent even started the weapon systems. Just been looking around to try and solve issues before i get to them, so far ive got most of the systems coded: Player movement, day and night cycle with time, health and armor, wanted level system (for player and peds) police units up to the army, EMS coded also, all the UI inc minimap and a world map, money system inc ATMs & currenty using the city demo scene to develop it all on. Ive been trying this project for a few years now, using the synty packs, the last project ran into big issues that i couldn't easily solve. I had more systems done for that project, like vehicles with real physics and weapons (minus any ik), so i can reuse some code from there. Thanks for getting back, most don't and that's not helpful.

@@TheKiwiCoder ok but how

@@cooldev2203 keep following the series, or jump ahead. Theres videos later on that cover weapon switching.

I did. It's still floating....

Hey! I'm new in Unity and I have same problem. I imported my character from assets store, what to you mean by making sure that none of bones are scaled?

@@yeetbox5843 just check few random bones transform for being scaled for example 0.99999 on some axis. Or sometimes bones could be ok, but mesh is scaled 100

A different animation for each weapon is likely easiest.

Hey! This video shows how to aim a weapon: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-ajmp3J7N3Ow.html Shooting tutorial coming soon!

Hi you can reference the source objects via constraint.data.sourceObjects. It's also possible to add multiple source objects to the constraint and toggle the weights of each on/off via script or animation. Hope that helps

I have witnessed two legends talking to each other O^O

@@firebolttz9058 lol

I have not tried that yet, though I’m interested to hear the results!

It’s not detailed in this video, but you could use a multi parent constraint and attach to the spine or hips, with an offset.

@@TheKiwiCoder Thank you! I also have another question, which what do i need to write in script in order to disable the Rig Builder component during the game is running?

WJS Jason setting the weight to 0 should disable everything

So glad someone else had the same issue as I did, multi parent constrain on the spine, and I set the weapon as the constrained object, works like a charm!!

My latest video will release today which covers this!!

@Nagato is better than Punk Naruto any reason to use ik? Might be easier to use animation and keyframe the hands to the correct locations throughout the clip

You’re welcome! You can pull the gun out of the skeleton hierarchy and keep it as a sibling of it instead. Then use a multi parent constraint to attach it to the skeleton. Checkout this: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-ajmp3J7N3Ow.html

@@TheKiwiCoder thank you, it works!

Saskia Hostni 👌🎉

its when i put the weapon in Source Object/Target (2:37) that it starts to happen not sure why

Compare what is different with your asset to the one that works. I’ve heard of this problem a few times but never encountered it myself sorry

@@TheKiwiCoder Well my file just floats in the air when put the target IK and the asset one just works fine. Oh well, I am going to stick to the one that works. Thanks for the advice and the tutorials.

Double check the hand is assigned to the tip and the shoulder is assigned to the root, and you’ve got a hint node set close to the elbow ish.