Working on a 2d platformer ran into an issue.

Unity Engine
1

[code
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class playermovement : MonoBehaviour
{
[SerializeField] private float Speed;

[SerializeField] private float jumpheight;
Rigidbody2D rb2d;
//problem code below
OnCollisionExit(Collision other) {
Speed * 15;
}

OnCollisionEnter(Collision other) {
Speed * 1;
}
//Problem code above

private void Awake()
{
rb2d = GetComponent();
}
private void FixedUpdate() {
float HorizontalInput = Input.GetAxis(“Horizontal”);

rb2d.velocity = new Vector2 (HorizontalInput * Speed, rb2d.velocity.y);
//code to switch the position of the sprite left or right
if(HorizontalInput> 0.01f )
transform.localScale = Vector3.one;
else if (HorizontalInput< -0.01f )
transform.localScale = new Vector3(-1,1,1);

//jump code
if(Input.GetKey(KeyCode.Space))
{
rb2d.velocity = new Vector2 (rb2d.velocity.x , jumpheight);
}

}

}
]

This is the code I am writing for moving a slime in a 2d environment. The goal of the problem code is to when in the air increase the characters speed and when on the ground reduce it. Any insight or help would be very much apprieciated. Thank anyone in advance.

2

A couple of things first:

  • Always use code-tags when posting code (please edit your post)
  • State what the problem actually is and ask a specific question

It looks like you’re just guessing at how things work because you seem to be using 2D physics but are also using 3D physics callbacks. Watching at least a single 2D physics tutorial would show you this. It also looks like you’re struggling to understand how to write code, which is fine, but you’re asking for “insight”.

The following isn’t valid code for instance (ignoring that it’s a 3D physics callback).

OnCollisionEnter(Collision other) {
Speed * 1;
}
3

This looks like you’re just making up a new Drago Gaming computer language. While that’s a fun mental exercise, you actually will need to learn properly C# coding to be successful in Unity.

If you’re just making typing mistakes, you need to increase your typing accuracy or you will waste a lot of your time. You can fix your typing mistakes all by yourself… here is how:

The complete error message contains everything you need to know to fix the error yourself.

The important parts of the error message are:

  • the description of the error itself (google this; you are NEVER the first one!)
  • the file it occurred in (critical!)
  • the line number and character position (the two numbers in parentheses)
  • also possibly useful is the stack trace (all the lines of text in the lower console window)

Always start with the FIRST error in the console window, as sometimes that error causes or compounds some or all of the subsequent errors. Often the error will be immediately prior to the indicated line, so make sure to check there as well.

All of that information is in the actual error message and you must pay attention to it. Learn how to identify it instantly so you don’t have to stop your progress and fiddle around with the forum.

Remember: NOBODY here memorizes error codes. That’s not a thing. The error code is absolutely the least useful part of the error. It serves no purpose at all. Forget the error code. Put it out of your mind.

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!

4

sorry for not specifying and the code-tags things. the 3d physics was a bit of code i got from a video for swapping sprites left and right. the goal of multiplying the speed was to when the player collided with something slow them down but when not touching a surface speed the character up. I simply thought that multplying the speed float was an option but it isnt so iwas posting to see if anybody had a way to change variables on collision enter and exit.

5

actually the only errors i got were from the problem code which is because i was trying to find a way to edit variables on collision enter and exit.

and the follow coding tutorials like a robot thing im just doing this for fun not looking to be in the industry.

6

Sorry about this post i found a way around it by instead of multiplying the varible i set the varible.