I was doing the MMD4Unity research. I do this because, on Google, if you want a Hair Physics, you have to wrote a script, or key frame it naturally in your model. Ain’t nobody got time for that keyframing! So, this might be very useful for easy Joint-based hair / cloth physics, even wrote a script was useful too.
Okay, so it’ll be like this. It could be very awesomely epic if you are not lazy to set the character joint setting.
“It’s long and complicated, i better use keyframe method.” Yeah true, but what to do when the hair colliding object because of your keyframing method ?
Let’s get Neru Akita as example (Model from MMD, some motion from Unity-chan).
3. If your character has a Character Controller on it / Playable, Open Tags & Layer, add 2 layers. Set ‘Player’ layer to object that has Character Controller on it. Else, set the object that you want to have a hair / cloth physics like Hair Bones1, Hair Bones2, and so on, or Hair/Cloth physics collider like MidSpine (That has Collider, so hair / cloth wont clip like hell). Basically, Just set Cloth Layer to Skinned Mesh Renderer, and set it to all children.
4. Go to your character controller script. Whatever script is OK as long as its located on Object that has Character Controller on it. Don’t make a new script. Just add this line to function Start() or void Start(). Works on both C# and JS. 8 is Cloth layer, 9 is Player layer. it’s all up to you on what layer you set the Cloth or Player layer. If you set cloth layer to 10, then write 10.
5. Alright now let’s add Rigidbody on cloth’s / hair’s root bone. For the root of the cloth (like this below), turn on isKinematic and turn off useGravity. Root doesn’t need a Character Joint, Collider is optional.
6. Now set the Character Joint’s connected body. For instance, 1 (Cloth Root), 2 (1’s child), 3 (2’s child). 3’s connected body is 2, 2’s connected body is 1, and 1 doesn’t have a Character Joint. Like the picture below.
7. Set bone’s swing limit, spring, high twist limit, low twist limit that suits to your model.
8. Now add some collider to body that Hair or cloth will collide. Remember to set the body layer to CLOTH, so your character controller wont collide it. I add the colliders on Body, Hands, and Head.
Because if you don’t add colliders, it’ll look like this:
As I said, I leave making games because I need to level up my CG level. I said I was give up right ? No, and never. I just need to learn to make a better CG Artwork. I’m currently making a mascot model for Imagination, named Imajine-chan. but, I don’t have an inspiration for her character design.
EDIT : “My Character raycast’s script is broken because of this.” Well, you could replace Cloth to IgnoreRaycast layer.