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Question by IanMancuso · Jul 11, 2017 at 08:53 PM · scripting problemphysics2d game2d physicsmotor

How do I change 2d motor speed from a script?

Here is my code so far

 using System.Collections;
  using System.Collections.Generic;
  using UnityEngine;
  
  public class Paddle : MonoBehaviour {
      private Rigidbody2D rb2d;
      private HingeJoint2D jointRef;
      private JointMotor2D motorRef;
      public float speed = -100;
      // Use this for initialization
      void Start () {
          rb2d = GetComponent<Rigidbody2D> ();
          jointRef = GetComponent<HingeJoint2D> ();
          motorRef = jointRef.motor;
      }
      
      // Update is called once per frame
      void Update () {
          if (Input.GetKeyDown ("left"))
              motorRef.motorSpeed = speed;
      }
  
      void FixedUpdate ()
      {
          
          
      }
  }
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avatar image Jwizard93 · Jul 11, 2017 at 09:24 PM 1
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Looks like you fixed up your reference issue since last I saw this scipt. But it seems you still don;t understand motorSpeed. $$anonymous$$otorSpeed is a LI$$anonymous$$IT. Nothing you do it is going to make anything move. Did you find a tutorial yet?

avatar image IanMancuso Jwizard93 · Jul 11, 2017 at 10:27 PM 0
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I know it's a limit, but, if I'm correct, a motor will apply a constant force, set in the inspector, until it reaches that speed. What I'm trying to do, is change that max speed from 0 to "speed" when I want it to move.

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Answer by unity_5F950F9CFD872127115E · Sep 11, 2021 at 11:15 AM

  1. Create a new motor.

  2. Set the values.

  3. Assign the motor to the hingjoint.motor.


JointMotor2D motorRef = new JointMotor2D(); //Set values of motor jointRef.motor = motorRef;


This worked for me.

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