How to increase run speed to a maximum while a run button is held

Questions & Answers
1

Edit:I’m very new to Unity and only just starting to grasp the basics here.

The idea is to have a button, which when pressed will slowly add speed onto the normal walk speed until a maximum running speed is reached. I’d tried this:

using UnityEngine;
using System.Collections;

public class Mario : MonoBehaviour {

	public Transform mario;
	public int marioMax = 20;
	public int marioWalk = 7;

	// Use this for initialization
	void Start () {
	
	}
	
	// Update is called once per frame
	void Update () {

		//Mario can move left and right
		mario.Translate (Vector3.right * marioWalk * Input.GetAxis ("Horizontal") * Time.deltaTime);

		//a button can be pressed to make Mario run

		if (Input.GetButtonDown ("KeyCode.LeftShift")) {
		//if a button is pressed take mario's walking speed and slowly increase to it a maximum
			mario.Translate (Vector3.right* ForceMode.Acceleration * Input.GetAxis("Horizontal") * Time.deltaTime);
		}

But it doesn’t work, getting 3 errors:

Assets/Scripts/Mario.cs(26,50): error CS0019: Operator *' cannot be applied to operands of type UnityEngine.Vector3’ and `UnityEngine.ForceMode’

Assets/Scripts/Mario.cs(26,31): error CS1502: The best overloaded method match for `UnityEngine.Transform.Translate(UnityEngine.Vector3)’ has some invalid arguments

Assets/Scripts/Mario.cs(26,31): error CS1503: Argument #1' cannot convert object’ expression to type `UnityEngine.Vector3’

I think it’s because I can’t have vector3 and forcemode.acceleration together, but I could be wrong. I also know I’m not telling it that marioMax is the top speed, but have no idea how to implement that. Any ideas would be greatly appreciated.

2

Translate moves GameObject Transform, while Force mode is a parameter of AddForce method that you call on rigidBody component, which is not your case.

Just change line

   mario.Translate (Vector3.right* ForceMode.Acceleration * Input.GetAxis("Horizontal") * Time.deltaTime);

to

   mario.Translate (Vector3.right* marioMax * Input.GetAxis("Horizontal") * Time.deltaTime);