How To Code Ledge Grabbing for your Unity Game

[@tommycorsetti8152]

I've adapted this for a first person movement script. I'm going to try and work some lerp functions into this somehow. I wouldn’t have had a clue where to start if it wasn't for this vid. thank you

[@fear-the-phantom]

Good vid, gonna try it out for my Banjo-Kazooie style prototype

[@rxmfdddddddd]

Found you!

[@fear-the-phantom]

@@rxmfdddddddd ?

[@rxmfdddddddd]

@@fear-the-phantom I follow you on twitter :D

[@elpela6975]

Hello, my problem is that sometimes it grabs a higher side and other times a lower side of the box.

[@GENNAROTHEBEST94]

is this can be use in the 2d context?

[@thegamedevcave]

Should be yeah, might need a 2d specific verion of line cast for it though, not sure

[@apoorvpandey3D]

I use godot and this was very helpful to me. Thank you!

[@LaughingMajora]

Hello! :D
i have a problem, can you help me, please?
my character doesnt keep hanging the edge :C im using a raycast jump
this is my jump code
do you need my entire code?
private void PlayerJump()
{
if (Input.GetButtonDown("Jump") && isGrounded)
{
if(hanging)
{
_rb.useGravity = true;
hanging = false;
_rb.AddForce(Vector3.up * Jump, ForceMode.Impulse);
StartCoroutine(EnableCantMove(0.25f));
}
else
{
_rb.AddForce(Vector3.up * Jump, ForceMode.Impulse);
}
}
}

[@thegamedevcave]

Seems like you’re setting gravity to true when your character is hanging, it should be set to false and then back to true when the hanging stops

[@LaughingMajora]

@@thegamedevcave im kinda lost :'C
can you help me, please?
this is my full code
public class RbController : MonoBehaviour
{
[SerializeField]
private Rigidbody _rb;
[SerializeField]
private Camera _camera;
[SerializeField]
private float _rotation;
[SerializeField]
float Jump = 5f;
public float movementSpeed;
public float raycastDistance = 0.2f;
public float swingDamping = 0.95f;
public bool isJump = false;
public bool isGrounded = false;
public bool hanging;
bool canMove = true;
public Transform currentAnchor;
private bool isAtach;
private SpringJoint _springJoint;
public LayerMask groundLayer;
// Start is called before the first frame update
void Start()
{
_rb = GetComponent();
}
// Update is called once per frame
void Update()
{
PlayerMovement();
PlayerJump();
Anclar();
LedgeGrab();
RaycastHit hit;
if (Physics.Raycast(transform.position, Vector3.down, out hit, raycastDistance, groundLayer))
{
isGrounded = true;
}
else
{
isGrounded = false;
}
if (isAtach)
{
ApplySwingDamping();
}
}
private void PlayerMovement()
{
if (canMove)
{
float Hor = Input.GetAxis("Horizontal");
float Ver = Input.GetAxis("Vertical");
Vector3 velocity = Vector3.zero;
Vector3 direction = Quaternion.Euler(0, _camera.transform.eulerAngles.y, 0) * new Vector3(Hor, 0, Ver);
Vector3 movementDirection = direction.normalized;
if (Hor != 0 || Ver != 0)
{
velocity = direction * movementSpeed;
if (movementDirection != Vector3.zero)
{
Quaternion desiredRotation = Quaternion.LookRotation(movementDirection, Vector3.up);
transform.rotation = Quaternion.Slerp(transform.rotation, desiredRotation, _rotation * Time.deltaTime);
}
}
velocity.y = _rb.velocity.y;
_rb.velocity = velocity;
}

}
IEnumerator EnableCanMove(float waitTime)
{
yield return new WaitForSeconds(waitTime);
canMove = true;
}
private void PlayerJump()
{
if (Input.GetButtonDown("Jump") && isGrounded)
{
if(hanging)
{
_rb.useGravity = true;
hanging = false;
_rb.AddForce(Vector3.up * Jump, ForceMode.Impulse);
StartCoroutine(EnableCanMove(0.25f));
}
else
{
_rb.AddForce(Vector3.up * Jump, ForceMode.Impulse);
}
}
}
void Anclar()
{
if (Input.GetButtonDown("Sujetarse") && currentAnchor != null)
{
isAtach = true;
_rb.useGravity = false;
_springJoint = gameObject.AddComponent();
_springJoint.connectedBody = currentAnchor.GetComponent();
_springJoint.autoConfigureConnectedAnchor = false;
_springJoint.connectedAnchor = new Vector3(0f, -7f, 0f);
_springJoint.spring = 40.5f;
_springJoint.damper = 10f;
_springJoint.massScale = 2f;
}
else if (Input.GetButtonDown("Sujetarse") && isAtach)
{
isAtach = false;
//_rb.useGravity = true;
Destroy(_springJoint);
}
}
void ApplySwingDamping()
{
_rb.velocity *= swingDamping;
}
void LedgeGrab()
{
if (_rb.velocity.y < 0 && !hanging)
{
RaycastHit downhit;
Vector3 lineDownStart = (transform.position + Vector3.up * 1.5f) + transform.forward;
Vector3 lineDownEnd = (transform.position + Vector3.up * 0.7f) + transform.forward;
Physics.Linecast(lineDownStart,lineDownEnd,out downhit, LayerMask.GetMask("Ground"));
Debug.DrawLine(lineDownStart,lineDownEnd);
if(downhit.collider != null)
{
RaycastHit forwardHit;
Vector3 lineForwardStart = new Vector3 (transform.position.x, downhit.point.y-0.1f,transform.position.z);
Vector3 lineForwardEnd = new Vector3 (transform.position.x, downhit.point.y-0.1f, transform.position.z) + transform.forward;
Physics.Linecast(lineForwardStart, lineForwardEnd, out forwardHit, LayerMask.GetMask("Ground"));
Debug.DrawLine(lineForwardStart, lineForwardEnd);
if (forwardHit.collider != null)
{
_rb.useGravity = false;
_rb.velocity = Vector3.zero;
hanging = true;
Vector3 hangPos = new Vector3(forwardHit.point.x, downhit.point.y, forwardHit.point.z);
Vector3 offset = transform.forward * -0.1f + transform.up * -1f;
hangPos += offset;
transform.position = hangPos;
transform.forward = -forwardHit.normal;
canMove = false;
}
}
}
}
}

[@RacTeamGames]

how can you add thr vector3s and i cant

[@thegamedevcave]

you're likely typing vector3 instead of Vector3.

[@RacTeamGames]

@@thegamedevcave Im not its just not working

[@thegamedevcave]

@@RacTeamGames if you're having trouble with the basics like adding a variable I suggest you first take a step back and go through some of my unity basics videos ruclips.net/p/PLoReGgpfex3xS-zXTujxo_flRkLBgxxd3

[@TheDigitalLenny]

Hello I been having some issues with my fwdRayCast and tried using a debug to see why my player wasn't finding the ledge. It seems to only register the Down hit raycast are there any solutions to this problem?
//Foward Cast
if (downHit.collider != null)
{
Debug.Log("DOWN HIT");
lineFwdStart = new Vector3(transform.position.x + downHit.point.y - 0.1f, transform.position.z);
lineFwdEnd = new Vector3(transform.position.x + downHit.point.y - 0.1f, transform.position.z) + transform.forward;
Physics.Linecast(lineFwdStart, lineFwdEnd, out forwardHit, hangMask);
Debug.DrawLine(lineFwdStart, lineFwdEnd, Color.red);
if (forwardHit.collider != null)
{
Debug.Log("FWD HIT");
rb.useGravity = false;
rb.velocity = Vector3.zero;
isHanging = true;
//Hang animation
Vector3 hangingPos = new Vector3(forwardHit.point.x, downHit.point.y, forwardHit.point.z);
Vector3 offset = transform.forward * -0.1f + transform.up * -1f;
hangingPos += offset;
transform.position = hangingPos;
transform.forward = -forwardHit.normal;
}
}

[@thegamedevcave]

i'm thinking it might be this line
lineFwdEnd = new Vector3(transform.position.x + downHit.point.y - 0.1f, transform.position.z) + transform.forward;
you're adding transform.forward to it, which is correct but now your line cast is only casting a really short distance in front of the character, just 1 single unit. you want to probably muliply that transform.forward by some number (i'd suggest making it a variable to test out what number works best)

[@TheDigitalLenny]

@@thegamedevcave Thank you the player is starting to react! to the hanging but is off and sometimes will be hanging about the wall haha. I also saw i had an error in my code
i had: lineFwdEnd = new Vector3(transform.position.x + downHit.point.y - 0.1f, transform.position.z) + transform.forward;
istead of: lineFwdEnd = new Vector3(transform.position.x, downHit.point.y - 0.1f, transform.position.z) + transform.forward;
🤦‍♂😂

[@elpela6975]

@@TheDigitalLenny try do this in the last part of de function:
if (fwdHit.collider != null)
{
Invoke(nameof(NewPosHang), 0.01f);
}
}
}
}
public void NewPosHang()
{
rb.useGravity = false;
rb.velocity = Vector3.zero;
hanging = true;
Vector3 hangPos = new Vector3(fwdHit.point.x, downHit.point.y, fwdHit.point.z);
Vector3 offset = transform.forward * -0.1f + transform.up * -1f;
hangPos += offset;
transform.position = hangPos;
transform.forward = -fwdHit.normal;

}

[@KawaiiProductions]

Does this work for the Third Person template as well?