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Question by toadflaxunf · Dec 23, 2017 at 10:09 PM · physicsunity5velocitythrowing

Throw Ball Forwards

I have written a script that allows me to pick up a ball and move it around according to my mouse position:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class dragObject : MonoBehaviour {
 
     float distance = 2;
     public Camera Stall;        // stall camera
     
     void OnMouseDrag()
     {
         Stall = GameObject.Find("Stall Camera").GetComponent<Camera>();
 
         Vector3 mousePosition = new Vector3(Input.mousePosition.x,
                                             Input.mousePosition.y, distance);
 
         Vector3 objPosition = Stall.ScreenToWorldPoint(mousePosition);    
 
         transform.position = objPosition;
 
         if (Input.GetKeyDown(KeyCode.F))
         {
             // When F is pressed, launch the ball forwards on the Z axis
         }
     }
     
 }

But I can't figure out a way of getting the ball to launch forwards in the if statement without the sphere just flashing instead of actually moving.

Thank in advance

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Answer by Alanisaac · Dec 23, 2017 at 10:37 PM

In general, to simulate "physics stuff", Unity provides a helpful component called a Rigidbody. You can find more information in Unity's main tutorials.

Essentially, you'll want to give the ball a rigidbody component. With that component you can do things like add force in a specific direction, or simply set a velocity. You can also make use of gravity, if you want to.

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