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Question by theAbtahi · Aug 16, 2019 at 09:02 PM · rotationscripting problemmovementphysic

Help regarding "Collect Cubes" Like Player Movement and Rotation

Hi fellow game devs, I am having difficulty recreating kinda same movement and rotation like the game "Collect Cubes"

  • https://play.google.com/store/apps/details?id=com.cinna.collectcubes&hl=en

  • https://apps.apple.com/us/app/collect-cubes/id1465222322

So far I have wrote an script that somewhat works like the game but I haven't yet been able to reach the desired outcome. In Collect cubes the player moves and smoothly rotates along the user touch swipe/drag direction and the smooth transition don't mess with collision or other physics properties.

Here is what I have done so far..

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using DG.Tweening;
 
 public class PlayerController : MonoBehaviour
 {
     private Rigidbody rigidBody;
     private Vector3 screenPoint;
     private Vector3 offset;
     private Vector2 startPos;
     private bool isSwiping;
     private Vector3 direction;
     private Vector2 currentSwipeDelta;
     private Vector2 previousSwipeDelta;
     private Vector3 moveDirection;
     public float movementSpeed;
     private Vector3 newDir;
     private float swipeStartTime;
     private float swipeEndTime;
     private float swipeInterval;
 
     // Start is called before the first frame update
     void Start()
     {
         rigidBody = GetComponent<Rigidbody>();
     }
 
     // Update is called once per frame
     void Update()
     {
         PlayerInput();
     }
 
     private void PlayerInput()
     {
         if (Input.GetMouseButtonDown(0))
         {
             startPos = Input.mousePosition;
             GameManager.Instance.StartGame();
         }
 
         if (Input.GetMouseButton(0))
         {
             isSwiping = true;
             direction = Input.mousePosition - (Vector3)startPos;
             direction = Vector3.Normalize(direction);
         }
 
         if (Input.GetMouseButtonUp(0))
         {
             isSwiping = false;
             direction = Vector2.zero;
         }
 
         currentSwipeDelta = Vector2.zero;
 
         if (isSwiping)
         {
             currentSwipeDelta = Input.mousePosition - (Vector3)startPos;
         }
 
         transform.localPosition = new Vector3(Mathf.Clamp(transform.localPosition.x, -5.9f, 5.9f), transform.position.y, Mathf.Clamp(transform.localPosition.z, -1f, 21f));
     }
 
     private void FixedUpdate()
     {
         if (currentSwipeDelta.magnitude > 30)
         {
             moveDirection.x = direction.x;
             moveDirection.z = direction.y;
             moveDirection.y = 0f;
 
             // Rotation
             Quaternion newRotation = Quaternion.LookRotation(moveDirection);
             Quaternion deltaRotation = Quaternion.Euler(new Vector3(0f, 360f, 0f) * Time.deltaTime);
             rigidBody.MoveRotation(newRotation * deltaRotation);
 
             // Move
             rigidBody.velocity = moveDirection * movementSpeed;
         }
     }
 }

What I am doing wrong and what needs to be done to ac$$anonymous$$ve the smooth movement like Collect Cubes? Any help will be appreciated. Thanks in advance :)

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Answer by Meishin · Aug 17, 2019 at 09:04 AM

Hello @theAbta$$anonymous$$,

here are some easy tweaks (i'm not sure w$$anonymous$$ch one would actually be the one you seek) ;

To smooth direction change (and also velocity change given your script)

 // Smooth directions changes
 float directionSmoot$$anonymous$$ng = 0.5f,
 moveDirection.x = Mathf.Lerp(moveDirection.x, direction.x, directionSmoot$$anonymous$$ng) ;
 moveDirection.z = Mathf.Lerp(moveDirection.z, direction.y, directionSmoot$$anonymous$$ng) ;
 moveDirection.y = 0f;

To avoid lags (typo)

Quaternion deltaRotation = Quaternion.Euler(new Vector3(0f, 360f, 0f) * Time.fixedDeltaTime);

To limit the force applied by other objects on your player, try putting player rigidbody mass to a very $$anonymous$$gh value (tho it might reject objects quite violently). An other way would be to control player position in the LateUpdate function (and not it's rigidbody).

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avatar image theAbtahi · Aug 18, 2019 at 01:38 PM 0
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Thanks a lot :). I will try out the velocity and direction smoothing, regarding the rotation ..

 Quaternion deltaRotation = Quaternion.Euler(new Vector3(0f, 360f, 0f) * Time.fixedDeltaTime);
 

I have tried this before, but the result is not what I am looking for

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