[Solved] I am trying to build a space sim/ shooter type game.

Questions & Answers
1

I am trying to build a space sim/shooter type game kind of like elite dangerous but obviously much less feature because I am just starting out and learning, so I do not have the required experience or knowledge as of yet. I would like to add to it over timer as I learn new skills and gain knowledge. I have my movement script mostly working the way I would like but am having trouble with a couple things.

When the curSpeed is 0 I would like the ship to come to a complete stop, as of right now when I set the curSpeed to 0 in the inspector, it keeps moving either forward or backwords. The other thing is that I would like the speed to increment by maxAcceleration when the plus key is held down, or -maxAcceleration when the minus key is held down. As of right now it jumps by about 5 even when just tapping either button. I am including my script bellow. Any help would be greatly appreciated.

Ps. I am using Unity 5.5

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

namespace Space_Shooter_Proto
{
    [RequireComponent(typeof(Rigidbody))]
    public class ThrustTtest : MonoBehaviour
    {
        //Variables - Define Ship Movement
        private int maxSpeed = 150;
        private int minSpeed = 0;
        private int maxRevSpeed = -50;
        private int maxAcceleration = 1;
        public int curSpeed;
        private Rigidbody rb;



        void Awake()
        {
            rb = GetComponent<Rigidbody>();
        }


        // Use this for initialization
        void Start()
        {

        }

        // Update is called once per frame
        void Update()
        {
            ShipForwardThrust();
        }

        void ShipForwardThrust()
        {
            rb.AddForce(Vector3.forward * curSpeed * Time.deltaTime);

            if (Input.GetKey(KeyCode.Equals))
            {
                curSpeed += maxAcceleration;

                if (curSpeed == maxSpeed || curSpeed > maxSpeed)
                {
                    curSpeed = maxSpeed;
                }

            }

            if (Input.GetKey(KeyCode.Minus))
            {
                ShipReverseThrust();
            }

            Debug.Log("Current Speed is " + curSpeed);
        }

        void ShipReverseThrust()
        {
            
            
                curSpeed -= maxAcceleration;

                if (curSpeed == maxRevSpeed || curSpeed < maxRevSpeed)
                {
                    curSpeed = maxRevSpeed;
                }
            
        }
    }
}
2

Set the isKinematic(rb.isKinematic = true) to true and adjust the velocity to zero(rb.velocity = Vector3.zero), when greater than zero or less than zero(backwards) set the isKinematic to false(rb.isKinematic = false) and let the system adjust the velocity through AddForce. Also you should be using FixedUpdate instead of just Update for your physics operations.

Something like:

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

namespace Space_Shooter_Proto
{
	[RequireComponent(typeof(Rigidbody))]
	public class ThrustTtest : MonoBehaviour
	{
		//Variables - Define Ship Movement
		private int maxSpeed = 150;
		private int minSpeed = 0;
		private int maxRevSpeed = -50;
		private int maxAcceleration = 1;
		public int curSpeed;
		private Rigidbody rb;

		void Awake()
		{
			rb = GetComponent<Rigidbody>();
		}


		// Use this for initialization
		void Start()
		{

		}

		// Update is called once per frame
		void FixedUpdate()
		{
			ShipForwardThrust();
		}

		void ShipForwardThrust()
		{
			if (Input.GetKey(KeyCode.Equals))
			{
				curSpeed += maxAcceleration;

				if (curSpeed == 0)
				{
					rb.isKinematic = true;
					rb.velocity = Vector3.zero;
				}
				else
				{
				if (rb.isKinematic == true)
					rb.isKinematic = false;
				}
				
				if (curSpeed == maxSpeed || curSpeed > maxSpeed)
				{
					curSpeed = maxSpeed;
				}

			}

			if (Input.GetKey(KeyCode.Minus))
			{	
				ShipReverseThrust();
			}

			rb.AddForce(Vector3.forward * curSpeed * Time.deltaTime);

			Debug.Log("Current Speed is " + curSpeed);
		}

		void ShipReverseThrust()
		{
			curSpeed -= maxAcceleration;

			if (curSpeed == 0)
			{
				rb.isKinematic = true;
				rb.velocity = Vector3.zero;
			}
			else
			{
				if (rb.isKinematic == true)
					rb.isKinematic = false;
			}
				
			if (curSpeed == maxRevSpeed || curSpeed < maxRevSpeed)
			{
				curSpeed = maxRevSpeed;
			}
		}
	}
}