How can I increase the speed of the player when they run into an object?

Questions & Answers
1

I’m making a simple racing game and part of the game is running into certain objects that will increase your speed, but I can’t get the speed to change. Here’s what I have for code:

using UnityEngine;
using System.Collections;

public class P1Move : MonoBehaviour {

    public float speed;
    public float increaseSpeed;

    private Rigidbody rb;
    private Vector3 movement;
    private float actualInc;
    private bool spdUp = false;

    void Start()
    {
        rb = GetComponent<Rigidbody>();
        actualInc = speed * increaseSpeed;
    }

    void FixedUpdate()
    {
        if (spdUp == false)
        {
            float h = Input.GetAxisRaw("HorizontalP1");
            float v = Input.GetAxisRaw("VerticalP1");

            Vector3 movement = new Vector3(h, 0, v);
            rb.AddForce(movement * speed);
        }
        
        if (spdUp == true)
        {
            float h = Input.GetAxisRaw("HorizontalP1");
            float v = Input.GetAxisRaw("VerticalP1");

            Vector3 movement = new Vector3(h, 0, v);
            rb.AddForce(movement * actualInc);
        }
    }

    void onTriggerEnter (Collider other)
    {
        if (other.tag == "SpdUp")
        {
            spdUp = true;
        }
    }
}
2

in those objects, create a box collider and insert in a script this function:

void OnTriggerEnter ()
{
   your_player_speed_script_name speedPlayer = GameObject.Find ("your player name").GetComponent<your_player_speed_script_name> ();
   speedPlayer.SpeedUp ();
}

where your_player_speed_script_name is the name of the script that allow movement on your player, speedPlayer is an arbitrary name string, and *SpeedUp()*is a public void of your script that allow movement on your player, where you can change the speed

SpeedUp () must be public void, and not void