Unity metaverse (II), mixamo & animator hybrid tree and animation fusion

Mixamo

brief introduction

Mixamo yes Adobe The company launched online free Character animation library , Address ：Mixamo, We can search for the character animation needed for development and download it .

Instructions

For example, we want to Avatar Add a role Idle Animation , stay Search Search in the search bar ：

Can pass UPLOAD CHARACTER Upload our own Avatar Model to preview the animation effect ：

Click on DOWNLOAD You can download the corresponding character animation , After downloading to Unity in , stay Import Settings Import settings Rig Window , take Animation Type That is, the animation type is changed to Humanoid Human animation ：

Unity Animator

Blend Tree Mixed tree

Blend Tree yes Animator Controller A special state type in animation state machine , Used between multiple animations Smooth blend , The influence of each animation on the final effect is determined by Mixing parameters control , It is often used to deal with the blending between mobile animations .

For example, we are in Mixamo The animation library is downloaded Idle、Walk、Sprint, That is, static 、 walk 、 Run three animations , Next, I want to use Blend Tree Through a parameter Speed That is to control the mixing between the three animations by moving speed .

First of all, these three animated Loop Time Set to true, It means that they are Loop Playback Of ：

stay Animator Pass through Right click > Create State > From New Blend Tree To create a hybrid tree , Name it Move, And create parameters Speed:

Double click to enter the hybrid tree , Add three stills 、 walk 、 Run three animations , Because we use a parameter Speed To control mixing , therefore Blend Type Use default 1D The way ,Threshold The thresholds are set to 0、10、25：

Set through the value entered by the user Speed Parameters ：

using UnityEngine;

namespace SK.Framework.Avatar
{
    
    /// <summary>
    /// Avatar Animation control 
    /// </summary>
    public class AvatarAnimatorController : AvatarMovementController
    {
    
        // Animation parameters 
        private static class AnimatorParameters
        {
    
            public readonly static int Speed = Animator.StringToHash("Speed");
        }

        private Animator animator;

        protected override void Start()
        {
    
            base.Start();
            animator = GetComponent<Animator>();
        }

        protected override void Update()
        {
    
            base.Update();
            animator.SetFloat(AnimatorParameters.Speed, Mathf.Clamp01(input.magnitude) * speed);
        }
    }
}

Animation fusion

Animation fusion refers to the fusion playback between two animations , For example, in the third person shooting game, players shoot while walking , It can be understood as moving + Fusion playback of shooting animation ：

Here we walk + Take the animation fusion of greeting as an example , We are Mixamo Download one from the animation library Wave Animation , stay Animator Create a new Layer Hierarchy , take Weight The weight is set to 1,Blending Set to Override The way , And create a Avatar Mask：

Avatar Mask Disable other parts except the right hand and right arm , Because we only need our right hand and right arm to greet ：

Add one Trigger Parameters of type , Used to trigger Wave action ：

Suppose the user presses Shortcut key 1 Trigger when Wave action ：

using UnityEngine;

namespace SK.Framework.Avatar
{
    
    /// <summary>
    /// Avatar Animation control 
    /// </summary>
    public class AvatarAnimatorController : AvatarMovementController
    {
    
        // Animation parameters 
        private static class AnimatorParameters
        {
    
            public readonly static int Speed = Animator.StringToHash("Speed");
            public readonly static int Wave = Animator.StringToHash("Wave");
        }

        private Animator animator;

        protected override void Start()
        {
    
            base.Start();
            animator = GetComponent<Animator>();
        }

        protected override void Update()
        {
    
            base.Update();
            animator.SetFloat(AnimatorParameters.Speed, Mathf.Clamp01(input.magnitude) * speed);

            if (Input.GetKeyDown(KeyCode.Alpha1))
            {
    
                animator.SetTrigger(AnimatorParameters.Wave);
            }
        }
    }
}