How to Play random animation for Attack

Questions & Answers
1

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I am trying to play a random attack animation each time I call a function. I have 3 animations DAT will be trigger using 3 trigger parameters. After clicking the button many times, it tends to keep the triggers on even after I have stopped pressing. What I want is DAT each time I press the button n random animation is played and the next click plays a new one. I am new to unity so if you have better ways of doing this, am open for suggestions.

2

I was going to suggest the below which is effectively the same as your code with fewer lines.

void Attack()
{
    int randomNumber = Random.Range(1, 4);
    anim.SetTrigger("atk" + randomNumber);
}

It sounds like you might be running into the same issue as posted here. You should try some of the suggestions posted on that thread.

Hope that helps!

5

Unfortunately there seems to be no generic way of doing this. I googled and searched the docs but simply could not find a way. Random transition is definitely a feature that should be supported out of the box but I could not find a way to get number of outgoing transitions from a state in runtime either — so much for making a generic randomizer.

That said… below is code for SMBRandomInt.cs which I just made. It makes setting up a random transition from the Entry node of sub state machine as easy as I could make it for now.

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

// Randomizes an integer parameter at transition to the Entry node of a state machine. This parameter can be used for choosing a random transition out from the Entry node. 
//
// How to setup a random transition from the Entry node of a sub state machine: 
// 
//  1) Attach SMB Random Int to Your Sub State Machine 
// 
//     - copy this SMBRandomInt.cs to your Assets folder 
//     - click your sub state machine in Animator, select "Add Behavour" in object inspector and choose SMB Random Int
//  
//  2) Configure SMB Random Int in Inspector
//   
//     - Enter new name for the random parameter if you are not happy with RandomInt
//     - Add the chosen parameter to your Animator's list of parameters as Integer type
//     - Configure MaxValue = [number of outgoing transitions - 1]
// 
//  3) Setup outgoing transitions
//   
//     - default transition always runs if any other doesn't -- let's have it run if our random value is 0
//     - for the first additional outgoing transition set condition [random parameter name] Equals 1
//     - for the second additional outgoing transition set condition [random parameter name] Equals 2
//     - ... etc etc ... 


public class SBMRandomInt : StateMachineBehaviour
{
    [Tooltip("The parameter name that will be set to random integer value. You must add this into your animator's parameter list as an Integer.")]
    public string parameterName = "RandomInt";

    [Tooltip("Minimum generated random value.")]
    public int minValue = 0; 

    [Tooltip("Maximum generated random value.")]
    public int maxValue = 1; 

    // OnStateMachineEnter is called when entering a state machine via its Entry Node
    override public void OnStateMachineEnter(Animator animator, int stateMachinePathHash) {
        int value = Random.Range(minValue,maxValue+1);
        animator.SetInteger(parameterName,value);
   }

}
3

Alternatively you can use the animator sub-state machine to play a randomized animation.
I’ve seen a youtube video explaining this process but will link to the official video.

4

Hi @darchyneer,

Try the code that I used:

int randomAttack = Random.Range(1, 4);
playerAttackAnim.SetTrigger(“Attack”);
playerAttackAnim.SetInteger(“randomAttack”, randomAttack);

You need 2 Parameters in your Animator:

  1. randomAttack - Int
  2. Attack - Trigger

Set both parameters in your transition, set “randomAttack” to equals “1” for your attack1, and so fort.

Hope this helps.

6

hello everyone, I’ve brainstormed this problem and here’s my solution:

Pros:

  • No need to use Animator.parameter
  • list of nameHashes is updated automaticly at OnBeforeSerialize
    Cons:
  • use Crossfade(stateNameHash) to change animation
    Long story short:

Animator.StateMachine with child random animations and StateMachineBehaviour on it, which contains editor-cached nameHashes for each random state and execute Animator.Crossfade(randomHash) at OnStateEnter. There is also some minor checks to not execute Crossfade infinitely.