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Question by Flamingo321 · Dec 27, 2014 at 08:15 PM · movementplaneaccelerationflightaircraft

How can I accelerate my Object to a maximum speed

Currently I'm working on a project , in which you can fly an aircraft. I have got the basic movement of it set up , but it instantly goes to maximum Speed if I press "W". So how can I slowly accelerate it to maximum Speed and decelerate it if I no longer press "W". Thank you very much in advance for your answer.

Here is the script I already made:

using UnityEngine;

using System.Collections;

 public class RealisticPlane : MonoBehaviour {
     public float maxSpeed = 10;
     public float maxLift = 5;
     // Use this for initialization
     void Start () 
     {
     
     }
     
     // Update is called once per frame
     void Update () 
     {
         transform.Rotate ( Input.GetAxis ("Vertical") , Input.GetAxis("RollAxis") , -Input.GetAxis ("Horizontal"));
         if (Input.GetKey (KeyCode.W))
         {
               transform.Translate(Vector3.down * Time.deltaTime * maxSpeed);
         }
 
         float heightPosition = Terrain.activeTerrain.SampleHeight (transform.position);
         if (heightPosition > transform.position.y)
         {
             transform.position = new Vector3 (transform.position.x,
                                               heightPosition,
                                               transform.position.z);
         }
     }
 }
 

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avatar image Graham-Dunnett ♦♦ · Dec 27, 2014 at 08:17 PM 0
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Where is your velocity for the plane? Normally, if you press W you'd increase the velocity, until you reach maxSpeed. If W is not pressed, then you'd reduce the velocity, presumably down to zero. In your code you just apply maxSpeed.

avatar image Flamingo321 · Dec 27, 2014 at 08:24 PM 0
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I tried to get the velocity , but since the Plane doesn't have a rigidbody I can't use rigidbody.velocity.

avatar image Graham-Dunnett ♦♦ · Dec 27, 2014 at 08:42 PM 0
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So create a variable called velocity and use that.

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Answer by EmmaEwert · Dec 27, 2014 at 08:42 PM

Considering your class is called RealisticPlane, you may intend to add physical simulation of forces, momentum etc. Assuming this is the case;

Attach a rigidbody, and apply forces through Rigidbody#AddForce or Rigidbody#AddRelativeForce. This way, you can add a forward force every physics frame (in FixedUpdate, not Update) that the W-key is held.

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