(Unity2D) Switch movement style on collision












0















I have a player character in a topdown game that moves in grid-like movements (1 unit at a time), but when it hits a patch of ice (square), I want it to switch to lerp-movement, slide to the edge, and stop.



Currently I have 5 different colliders as children for each patch of ice: the ice collider itself, and 4 slightly distanced colliders, one for each side of the ice. When it hits the ice collider, depending on which direction it was heading in, it should lerp to the distanced collider associated.



Like so (it's hard to see the main collider but it's there):
ice



Here is the code I have been using for the down key (its basically the same for all keys):



else if (Input.GetKeyDown(KeyCode.DownArrow))
{
Vector2 movementDown = new Vector2(0, -1);
RaycastHit2D hitDown = Physics2D.Raycast(transform.position, movementDown, 0.05f);

if (hitDown.collider && hitDown.collider.gameObject.tag == "barrier")
{
Debug.Log("N/A");
}
else if (onIce)
{
player.transform.position = Vector3.Lerp(transform.position, downIce.transform.position, 100 * Time.fixedDeltaTime);
}
else
{
player.transform.position += new Vector3(movementDown.x, movementDown.y, -0.1f);
}
}


EDIT: code that updates bool 'onIce':



void OnTriggerEnter2D(Collider2D collision)
{
if (collision.gameObject.tag == "ice") {
onIce = true;
}
}

void OnTriggerExit2D(Collider2D collision)
{
if (collision.gameObject.tag == "ice")
{
onIce = false;
}
}









share|improve this question

























  • So, whats exactly the problem?

    – Hesamom
    Nov 20 '18 at 6:58











  • It's not sliding. It keeps using the 'else' case.

    – Kat K
    Nov 20 '18 at 7:30











  • you should post the code that updates the "onIce" variable.

    – Lotan
    Nov 20 '18 at 8:06











  • @Lotan I have updated it.

    – Kat K
    Nov 20 '18 at 8:10






  • 1





    Is your collider a Trigger? If not, try OnCollisionEnter. Also try a non-friction physics material (assign it on the ice collider)

    – KYL3R
    Nov 20 '18 at 8:18
















0















I have a player character in a topdown game that moves in grid-like movements (1 unit at a time), but when it hits a patch of ice (square), I want it to switch to lerp-movement, slide to the edge, and stop.



Currently I have 5 different colliders as children for each patch of ice: the ice collider itself, and 4 slightly distanced colliders, one for each side of the ice. When it hits the ice collider, depending on which direction it was heading in, it should lerp to the distanced collider associated.



Like so (it's hard to see the main collider but it's there):
ice



Here is the code I have been using for the down key (its basically the same for all keys):



else if (Input.GetKeyDown(KeyCode.DownArrow))
{
Vector2 movementDown = new Vector2(0, -1);
RaycastHit2D hitDown = Physics2D.Raycast(transform.position, movementDown, 0.05f);

if (hitDown.collider && hitDown.collider.gameObject.tag == "barrier")
{
Debug.Log("N/A");
}
else if (onIce)
{
player.transform.position = Vector3.Lerp(transform.position, downIce.transform.position, 100 * Time.fixedDeltaTime);
}
else
{
player.transform.position += new Vector3(movementDown.x, movementDown.y, -0.1f);
}
}


EDIT: code that updates bool 'onIce':



void OnTriggerEnter2D(Collider2D collision)
{
if (collision.gameObject.tag == "ice") {
onIce = true;
}
}

void OnTriggerExit2D(Collider2D collision)
{
if (collision.gameObject.tag == "ice")
{
onIce = false;
}
}









share|improve this question

























  • So, whats exactly the problem?

    – Hesamom
    Nov 20 '18 at 6:58











  • It's not sliding. It keeps using the 'else' case.

    – Kat K
    Nov 20 '18 at 7:30











  • you should post the code that updates the "onIce" variable.

    – Lotan
    Nov 20 '18 at 8:06











  • @Lotan I have updated it.

    – Kat K
    Nov 20 '18 at 8:10






  • 1





    Is your collider a Trigger? If not, try OnCollisionEnter. Also try a non-friction physics material (assign it on the ice collider)

    – KYL3R
    Nov 20 '18 at 8:18














0












0








0








I have a player character in a topdown game that moves in grid-like movements (1 unit at a time), but when it hits a patch of ice (square), I want it to switch to lerp-movement, slide to the edge, and stop.



Currently I have 5 different colliders as children for each patch of ice: the ice collider itself, and 4 slightly distanced colliders, one for each side of the ice. When it hits the ice collider, depending on which direction it was heading in, it should lerp to the distanced collider associated.



Like so (it's hard to see the main collider but it's there):
ice



Here is the code I have been using for the down key (its basically the same for all keys):



else if (Input.GetKeyDown(KeyCode.DownArrow))
{
Vector2 movementDown = new Vector2(0, -1);
RaycastHit2D hitDown = Physics2D.Raycast(transform.position, movementDown, 0.05f);

if (hitDown.collider && hitDown.collider.gameObject.tag == "barrier")
{
Debug.Log("N/A");
}
else if (onIce)
{
player.transform.position = Vector3.Lerp(transform.position, downIce.transform.position, 100 * Time.fixedDeltaTime);
}
else
{
player.transform.position += new Vector3(movementDown.x, movementDown.y, -0.1f);
}
}


EDIT: code that updates bool 'onIce':



void OnTriggerEnter2D(Collider2D collision)
{
if (collision.gameObject.tag == "ice") {
onIce = true;
}
}

void OnTriggerExit2D(Collider2D collision)
{
if (collision.gameObject.tag == "ice")
{
onIce = false;
}
}









share|improve this question
















I have a player character in a topdown game that moves in grid-like movements (1 unit at a time), but when it hits a patch of ice (square), I want it to switch to lerp-movement, slide to the edge, and stop.



Currently I have 5 different colliders as children for each patch of ice: the ice collider itself, and 4 slightly distanced colliders, one for each side of the ice. When it hits the ice collider, depending on which direction it was heading in, it should lerp to the distanced collider associated.



Like so (it's hard to see the main collider but it's there):
ice



Here is the code I have been using for the down key (its basically the same for all keys):



else if (Input.GetKeyDown(KeyCode.DownArrow))
{
Vector2 movementDown = new Vector2(0, -1);
RaycastHit2D hitDown = Physics2D.Raycast(transform.position, movementDown, 0.05f);

if (hitDown.collider && hitDown.collider.gameObject.tag == "barrier")
{
Debug.Log("N/A");
}
else if (onIce)
{
player.transform.position = Vector3.Lerp(transform.position, downIce.transform.position, 100 * Time.fixedDeltaTime);
}
else
{
player.transform.position += new Vector3(movementDown.x, movementDown.y, -0.1f);
}
}


EDIT: code that updates bool 'onIce':



void OnTriggerEnter2D(Collider2D collision)
{
if (collision.gameObject.tag == "ice") {
onIce = true;
}
}

void OnTriggerExit2D(Collider2D collision)
{
if (collision.gameObject.tag == "ice")
{
onIce = false;
}
}






unity3d collision-detection lerp






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Nov 20 '18 at 8:09







Kat K

















asked Nov 20 '18 at 0:15









Kat KKat K

326




326













  • So, whats exactly the problem?

    – Hesamom
    Nov 20 '18 at 6:58











  • It's not sliding. It keeps using the 'else' case.

    – Kat K
    Nov 20 '18 at 7:30











  • you should post the code that updates the "onIce" variable.

    – Lotan
    Nov 20 '18 at 8:06











  • @Lotan I have updated it.

    – Kat K
    Nov 20 '18 at 8:10






  • 1





    Is your collider a Trigger? If not, try OnCollisionEnter. Also try a non-friction physics material (assign it on the ice collider)

    – KYL3R
    Nov 20 '18 at 8:18



















  • So, whats exactly the problem?

    – Hesamom
    Nov 20 '18 at 6:58











  • It's not sliding. It keeps using the 'else' case.

    – Kat K
    Nov 20 '18 at 7:30











  • you should post the code that updates the "onIce" variable.

    – Lotan
    Nov 20 '18 at 8:06











  • @Lotan I have updated it.

    – Kat K
    Nov 20 '18 at 8:10






  • 1





    Is your collider a Trigger? If not, try OnCollisionEnter. Also try a non-friction physics material (assign it on the ice collider)

    – KYL3R
    Nov 20 '18 at 8:18

















So, whats exactly the problem?

– Hesamom
Nov 20 '18 at 6:58





So, whats exactly the problem?

– Hesamom
Nov 20 '18 at 6:58













It's not sliding. It keeps using the 'else' case.

– Kat K
Nov 20 '18 at 7:30





It's not sliding. It keeps using the 'else' case.

– Kat K
Nov 20 '18 at 7:30













you should post the code that updates the "onIce" variable.

– Lotan
Nov 20 '18 at 8:06





you should post the code that updates the "onIce" variable.

– Lotan
Nov 20 '18 at 8:06













@Lotan I have updated it.

– Kat K
Nov 20 '18 at 8:10





@Lotan I have updated it.

– Kat K
Nov 20 '18 at 8:10




1




1





Is your collider a Trigger? If not, try OnCollisionEnter. Also try a non-friction physics material (assign it on the ice collider)

– KYL3R
Nov 20 '18 at 8:18





Is your collider a Trigger? If not, try OnCollisionEnter. Also try a non-friction physics material (assign it on the ice collider)

– KYL3R
Nov 20 '18 at 8:18












1 Answer
1






active

oldest

votes


















0














Lerp is only getting called once, when you push the button. One way to fix it is by using a coroutine:



IEnumerator Slide() {
var t = 0f;
var start = player.transform.position; //we will change the position every frame
//so for lerp to work, we need to save it here.
var end = downIce.transform.position;
while(t < 1f){
t += Time.deltaTime;
player.transform.position = Vector3.Lerp(start, end , t);
yield return null; //returning null waits until the next frame
}
}


And then you use it like this:



...
else if (onIce)
{
this.StartCoroutine(this.Slide());
}
else
...


I think this is still not exactly what you want in your game because it will lerp to the center of the collider. If that's the case you can easily fix it by changing how it calculates the end variable in the coroutine to make the player only slide along the correct axis.






share|improve this answer
























  • It could also be off by one move.. because onIce will not be true until after you have already stepped on the ice. At the time of pressing the button when you first walk onto the ice, the player is not on the ice yet, and the trigger hasn't been hit yet.

    – Leo Bartkus
    Nov 21 '18 at 5:28













  • I fixed the 'lerping to center issue' by changing 'end' to a Vector2, and making its x or y coordinate of 'end' the same as the player's, depending on which trigger it collided with. (i.e. if it hits the left trigger, use the player's y coordinate, etc.)

    – Kat K
    Nov 29 '18 at 4:31











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1 Answer
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1 Answer
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oldest

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0














Lerp is only getting called once, when you push the button. One way to fix it is by using a coroutine:



IEnumerator Slide() {
var t = 0f;
var start = player.transform.position; //we will change the position every frame
//so for lerp to work, we need to save it here.
var end = downIce.transform.position;
while(t < 1f){
t += Time.deltaTime;
player.transform.position = Vector3.Lerp(start, end , t);
yield return null; //returning null waits until the next frame
}
}


And then you use it like this:



...
else if (onIce)
{
this.StartCoroutine(this.Slide());
}
else
...


I think this is still not exactly what you want in your game because it will lerp to the center of the collider. If that's the case you can easily fix it by changing how it calculates the end variable in the coroutine to make the player only slide along the correct axis.






share|improve this answer
























  • It could also be off by one move.. because onIce will not be true until after you have already stepped on the ice. At the time of pressing the button when you first walk onto the ice, the player is not on the ice yet, and the trigger hasn't been hit yet.

    – Leo Bartkus
    Nov 21 '18 at 5:28













  • I fixed the 'lerping to center issue' by changing 'end' to a Vector2, and making its x or y coordinate of 'end' the same as the player's, depending on which trigger it collided with. (i.e. if it hits the left trigger, use the player's y coordinate, etc.)

    – Kat K
    Nov 29 '18 at 4:31
















0














Lerp is only getting called once, when you push the button. One way to fix it is by using a coroutine:



IEnumerator Slide() {
var t = 0f;
var start = player.transform.position; //we will change the position every frame
//so for lerp to work, we need to save it here.
var end = downIce.transform.position;
while(t < 1f){
t += Time.deltaTime;
player.transform.position = Vector3.Lerp(start, end , t);
yield return null; //returning null waits until the next frame
}
}


And then you use it like this:



...
else if (onIce)
{
this.StartCoroutine(this.Slide());
}
else
...


I think this is still not exactly what you want in your game because it will lerp to the center of the collider. If that's the case you can easily fix it by changing how it calculates the end variable in the coroutine to make the player only slide along the correct axis.






share|improve this answer
























  • It could also be off by one move.. because onIce will not be true until after you have already stepped on the ice. At the time of pressing the button when you first walk onto the ice, the player is not on the ice yet, and the trigger hasn't been hit yet.

    – Leo Bartkus
    Nov 21 '18 at 5:28













  • I fixed the 'lerping to center issue' by changing 'end' to a Vector2, and making its x or y coordinate of 'end' the same as the player's, depending on which trigger it collided with. (i.e. if it hits the left trigger, use the player's y coordinate, etc.)

    – Kat K
    Nov 29 '18 at 4:31














0












0








0







Lerp is only getting called once, when you push the button. One way to fix it is by using a coroutine:



IEnumerator Slide() {
var t = 0f;
var start = player.transform.position; //we will change the position every frame
//so for lerp to work, we need to save it here.
var end = downIce.transform.position;
while(t < 1f){
t += Time.deltaTime;
player.transform.position = Vector3.Lerp(start, end , t);
yield return null; //returning null waits until the next frame
}
}


And then you use it like this:



...
else if (onIce)
{
this.StartCoroutine(this.Slide());
}
else
...


I think this is still not exactly what you want in your game because it will lerp to the center of the collider. If that's the case you can easily fix it by changing how it calculates the end variable in the coroutine to make the player only slide along the correct axis.






share|improve this answer













Lerp is only getting called once, when you push the button. One way to fix it is by using a coroutine:



IEnumerator Slide() {
var t = 0f;
var start = player.transform.position; //we will change the position every frame
//so for lerp to work, we need to save it here.
var end = downIce.transform.position;
while(t < 1f){
t += Time.deltaTime;
player.transform.position = Vector3.Lerp(start, end , t);
yield return null; //returning null waits until the next frame
}
}


And then you use it like this:



...
else if (onIce)
{
this.StartCoroutine(this.Slide());
}
else
...


I think this is still not exactly what you want in your game because it will lerp to the center of the collider. If that's the case you can easily fix it by changing how it calculates the end variable in the coroutine to make the player only slide along the correct axis.







share|improve this answer












share|improve this answer



share|improve this answer










answered Nov 21 '18 at 5:21









Leo BartkusLeo Bartkus

1,250612




1,250612













  • It could also be off by one move.. because onIce will not be true until after you have already stepped on the ice. At the time of pressing the button when you first walk onto the ice, the player is not on the ice yet, and the trigger hasn't been hit yet.

    – Leo Bartkus
    Nov 21 '18 at 5:28













  • I fixed the 'lerping to center issue' by changing 'end' to a Vector2, and making its x or y coordinate of 'end' the same as the player's, depending on which trigger it collided with. (i.e. if it hits the left trigger, use the player's y coordinate, etc.)

    – Kat K
    Nov 29 '18 at 4:31



















  • It could also be off by one move.. because onIce will not be true until after you have already stepped on the ice. At the time of pressing the button when you first walk onto the ice, the player is not on the ice yet, and the trigger hasn't been hit yet.

    – Leo Bartkus
    Nov 21 '18 at 5:28













  • I fixed the 'lerping to center issue' by changing 'end' to a Vector2, and making its x or y coordinate of 'end' the same as the player's, depending on which trigger it collided with. (i.e. if it hits the left trigger, use the player's y coordinate, etc.)

    – Kat K
    Nov 29 '18 at 4:31

















It could also be off by one move.. because onIce will not be true until after you have already stepped on the ice. At the time of pressing the button when you first walk onto the ice, the player is not on the ice yet, and the trigger hasn't been hit yet.

– Leo Bartkus
Nov 21 '18 at 5:28







It could also be off by one move.. because onIce will not be true until after you have already stepped on the ice. At the time of pressing the button when you first walk onto the ice, the player is not on the ice yet, and the trigger hasn't been hit yet.

– Leo Bartkus
Nov 21 '18 at 5:28















I fixed the 'lerping to center issue' by changing 'end' to a Vector2, and making its x or y coordinate of 'end' the same as the player's, depending on which trigger it collided with. (i.e. if it hits the left trigger, use the player's y coordinate, etc.)

– Kat K
Nov 29 '18 at 4:31





I fixed the 'lerping to center issue' by changing 'end' to a Vector2, and making its x or y coordinate of 'end' the same as the player's, depending on which trigger it collided with. (i.e. if it hits the left trigger, use the player's y coordinate, etc.)

– Kat K
Nov 29 '18 at 4:31




















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