koobas.hobune.stream
Help with raycast for for wall detection
I am working on a script which makes my enemy object patrol around a randomly generated map. What my script does is it has the enemy move forward until it reaches a certain distance from any wall right in front of it where it sets the speed variable to 0 so that forward motion stops. The next step it goes through (and this is where the issue is) is it does a ray cast 45 degrees to the left to see if there is a wall then looks to the right to see if there is a wall. if there is no wall on the left it runs left and checks the front again. if it detects the wall on the left it looks to the right and goes through a similar process. once there is no longer a detected wall in front the script changes the speed variable back to the enemy's starting speed so that it can move again. in the even that there is a wall to the left and right I set it to randomly choose left or right with a slight bias to left.
The main issue I am having is that when the object detects the wall in front it just stutters back and forth and doesn't rotate more than a fraction of a degree in either direction, which I can see in the transform component of the enemy object. I attempted to troubleshoot this my self and found that the program is never getting to the part of the script where it rotates so it might be something with that but I have been unable to determine for sure. This is not my full script, only the function I made to do the searching, the rest is just a FixedUpdate which calls the function and then does a vector3 transform forward based on the speed variable changed during the search function Any help, comments, criticism is appreciated
public void search(){
RaycastHit hit;
Ray ray = new Ray(transform.position, Vector3.forward);
if (Physics.Raycast (ray, out hit, wallDistance)) {
transform.Translate (Vector3.forward * Time.deltaTime * speed, Space.Self);
speed = killSpeed;
test1 = 3;
Ray rayLeft = new Ray (transform.position, vecLeft);
Ray rayRight = new Ray (transform.position, vecRight);
// the if statments in this section check the left, then the right to see if it is clear. if the way is clear for left it will immediatly go left, if not it will check
// the right then go right if it is clear. if both directions are obstructed it will randomly choose left or right with a bias to right and check again. if the path is
// clear it will move forward
if (Physics.Raycast (rayLeft, out hit, wallDistance)) {
if (Physics.Raycast (rayRight, out hit, wallDistance)) {
test1 = 5;
float path = Random.Range(0.0f,1f);
if (path >= 0.65f) {
transform.rotation = Quaternion.Slerp (transform.rotation, left, Time.deltaTime);
} else {
transform.rotation = Quaternion.Slerp (transform.rotation, right, Time.deltaTime);
}
} else {
transform.rotation = Quaternion.Slerp (transform.rotation, right, Time.deltaTime);
}
} else {
transform.rotation = Quaternion.Slerp (transform.rotation, left, Time.deltaTime);
}
} else {
test2 = 5;
speed = startSpeed;
}
}
I almost forgot the definitions for left and right Quaternion left = Quaternion.Euler(-0.1f,0,1); Quaternion right = Quaternion.Euler(0.1f,0,1); Vector3 movement = new Vector3 (0.0f, 0.0f, 1f);
I think your problem is with the logic that starts at line 13. It reads:
if we hit a wall left
if we hit a wall right
pick random direction
When it should read:
if we didnt hit a wall left
if we didnt hit a wall right
pick random direction
I am not entirely sure how to use the negative form of my original statement, any suggestions?
You can either do a couple things:
Physics.Raycast () == false
or
!Physics.Raycast ()
also the statement you mentioned is for the case if there is a wall in front of, and on both the left and right
I just outlined the logic for the entire statement (not including the wall in front check since that's a given). I outlined it, and I think that may be the problem because you are picking a random direction to go in when there are walls to either side. From here you end up walking into another wall, and you start the process over. To me, and without better knowledge about the code, this doesn't seem right. I think what the intended effect is for the code to pick a random direction if there is a wall in front, but not walls to either side. That's why I think you need to be checking if there isn't a wall, rather than if there is.
I made the edits to the logic but I'm still getting the same issue, any suggestions?
public void search(){
RaycastHit hit;
Ray ray = new Ray(transform.position, Vector3.forward);
if (Physics.Raycast (ray, out hit, wallDistance)) {
transform.Translate (Vector3.forward * Time.deltaTime * speed, Space.Self);
speed = killSpeed;
test1 = 3;
Ray rayLeft = new Ray (transform.position, vecLeft);
Ray rayRight = new Ray (transform.position, vecRight);
if (!Physics.Raycast (rayLeft, out hit, wallDistance)) {
if (!Physics.Raycast (rayRight, out hit, wallDistance)) {
test1 = 5;
float path = Random.Range (0.0f, 1f);
if (path >= 0.65f) {
transform.rotation = Quaternion.Slerp (transform.rotation, left, Time.deltaTime);
} else {
transform.rotation = Quaternion.Slerp (transform.rotation, right, Time.deltaTime);
}
} else {
transform.rotation = Quaternion.Slerp (transform.rotation, left, Time.deltaTime);
}
} else if (!Physics.Raycast (rayRight, out hit, wallDistance)) {
transform.rotation = Quaternion.Slerp (transform.rotation, right, Time.deltaTime);
} else {
float path = Random.Range(0.0f,1f);
if (path >= 0.65f) {
transform.rotation = Quaternion.Slerp (transform.rotation, left, Time.deltaTime);
} else {
transform.rotation = Quaternion.Slerp (transform.rotation, right, Time.deltaTime);
}
}
} else {
test2 = 5;
speed = startSpeed;
}
}
Okay, well another think I'm noticing is the left and right quaternions. They have a value of 0.1 and -0.1 on the x component, and I am pretty sure that needs to be in degrees. Additionally, it does not make sense for the rotation to be on the x component. If it's in 3D space, then I think it should be on the y component. If it is a 2D game, it should be the z component.
