2D NPC For Platformer

Unity Engine
1

I’m Working On A Game But I Don’t Know How To Make A Wandering NPC.
The NPC Is Limited To 3 Moves
1.Moving Left
2.Moving Right
3.Jumping
I’m Using Box Colliders And Rigidbodies.
If Anybody Could Help Me Out, That Be Greatly Appreciated.
Edit: I Found A Working Script Online, I Don’t Need Help Anymore
Edit 2: Here Is The Script That I Used, Customize Values To Your Liking.

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class NPCCode : MonoBehaviour
{
    internal Transform thisTransform;
    // Remember That You Need A Collider And Rigidbody
    public float moveSpeed = 10f;
    public Vector2 decisionTime = new Vector2(1, 4);
    internal float decisionTimeCount = 0;
    internal Vector3[] moveDirections = new Vector3[] { Vector3.right, Vector3.left, Vector3.up, Vector3.up, Vector3.zero, Vector3.zero };
    internal int currentMoveDirection;
    void Start()
    {
        thisTransform = this.transform;
        decisionTimeCount = Random.Range(decisionTime.x, decisionTime.y);
        ChooseMoveDirection();
    }
    void Update()
    {
        thisTransform.position += moveDirections[currentMoveDirection] * Time.deltaTime * moveSpeed;
        if (decisionTimeCount > 0) decisionTimeCount -= Time.deltaTime;
        else
        {
            decisionTimeCount = Random.Range(decisionTime.x, decisionTime.y);

            ChooseMoveDirection();
        }
    }
    void ChooseMoveDirection()
    {
        currentMoveDirection = Mathf.FloorToInt(Random.Range(0, moveDirections.Length));
    }
}
2

Start with tutorials, as many as it takes you to understand the process.

You will know you understand the process when you can complete Step #2 below.

Tutorials and example code are great, but keep this in mind to maximize your success and minimize your frustration:

How to do tutorials properly, two (2) simple steps to success:

Step 1. Follow the tutorial and do every single step of the tutorial 100% precisely the way it is shown. Even the slightest deviation (even a single character!) generally ends in disaster. That’s how software engineering works. Every step must be taken, every single letter must be spelled, capitalized, punctuated and spaced (or not spaced) properly, literally NOTHING can be omitted or skipped.

Fortunately this is the easiest part to get right: Be a robot. Don’t make any mistakes.
BE PERFECT IN EVERYTHING YOU DO HERE!!

If you get any errors, learn how to read the error code and fix your error. Google is your friend here. Do NOT continue until you fix your error. Your error will probably be somewhere near the parenthesis numbers (line and character position) in the file. It is almost CERTAINLY your typo causing the error, so look again and fix it.

Step 2. Go back and work through every part of the tutorial again, and this time explain it to your doggie. See how I am doing that in my avatar picture? If you have no dog, explain it to your house plant. If you are unable to explain any part of it, STOP. DO NOT PROCEED. Now go learn how that part works. Read the documentation on the functions involved. Go back to the tutorial and try to figure out WHY they did that. This is the part that takes a LOT of time when you are new. It might take days or weeks to work through a single 5-minute tutorial. Stick with it. You will learn.

Step 2 is the part everybody seems to miss. Without Step 2 you are simply a code-typing monkey and outside of the specific tutorial you did, you will be completely lost. If you want to learn, you MUST do Step 2.

Of course, all this presupposes no errors in the tutorial. For certain tutorial makers (like Unity, Brackeys, Imphenzia, Sebastian Lague) this is usually the case. For some other less-well-known content creators, this is less true. Read the comments on the video: did anyone have issues like you did? If there’s an error, you will NEVER be the first guy to find it.

Beyond that, Step 3, 4, 5 and 6 become easy because you already understand!

1 Like
3

thanks

thanks, but i was looking for a code answer. I’ll keep that into mind incase nobody else responds.

4

Awesome! If you find one let me know. I’ve never seen a code answer for Unity. There’s ALWAYS assets and scenes and prefabs involved.

1 Like
5

try making a copy of the player movement code and putting it on the npc, then add some code something like this

        moveJ = UnityEngine.Random.Range(0, jumpChance) == 0;
        if (moveTime <= 0) {
            moveTime = UnityEngine.Random.Range(movetimeMin, movetimeMax);
            int rand = UnityEngine.Random.Range(0, idleChance);
            moveR = rand == 0;
            moveL = rand == 1;
        }
        moveTime--;

then replace the player input with the moveL/R/J bools

you would use the movetimeMin/Max and jump/idleChance to adjust how the npc moves (all of those are ints). lowering jumpChance makes it jump more and lowering idleChance makes it walk more

6

Nothing Exists.