So I could use some input on a enemy | Official Unity Discord | Page 1

spiral wren Jun 8, 2022, 10:46 AM

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I'm having some issues with the angles the enemy is spotting the player from

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see the pictures below:

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the green line indicates that the enemy can see the player

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I want the player to be spotted when inside the yellow lines on picture 2

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it shouldn't be spotted on picture 1

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also, the FOV is pointing upwards when I want it to point forwards

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I didn't write the code myself, just made some changes to convert it to "2D"

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here are the two scripts:

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using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class FieldOfView : MonoBehaviour
{
    public float radius;
    [Range(0,360)]
    public float angle;

    public GameObject playerRef;

    public LayerMask targetMask;
    public LayerMask obstructionMask;

    public bool canSeePlayer;

    private void Start()
    {
        playerRef = GameObject.FindGameObjectWithTag("Player");
        StartCoroutine(FOVRoutine());
    }

    private IEnumerator FOVRoutine()
    {
        WaitForSeconds wait = new WaitForSeconds(0.2f);

        while (true)
        {
            yield return wait;
            FieldOfViewCheck();
        }
    }

    private void FieldOfViewCheck()
    {
        Collider[] rangeChecks = Physics.OverlapSphere(transform.position, radius, targetMask);

        if (rangeChecks.Length != 0)
        {
            Transform target = rangeChecks[0].transform;
            Vector3 directionToTarget = (target.position - transform.position).normalized;

            if (Vector3.Angle(transform.forward, directionToTarget) < angle / 2)
            {
                float distanceToTarget = Vector3.Distance(transform.position, target.position);

                if (!Physics.Raycast(transform.position, directionToTarget, distanceToTarget, obstructionMask))
                    canSeePlayer = true;
                else
                    canSeePlayer = false;
            }
            else
                canSeePlayer = false;
        }
        else if (canSeePlayer)
            canSeePlayer = false;
    }
}```

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and the editor script:

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using UnityEngine;

[CustomEditor(typeof(FieldOfView))]
public class FieldOfViewEditor : Editor
{
    private void OnSceneGUI()
    {
        FieldOfView fov = (FieldOfView)target;
        Handles.color = Color.white;
        Handles.DrawWireArc(fov.transform.position, Vector3.forward, Vector3.right, 360, fov.radius);

        Vector3 viewAngle01 = DirectionFromAngle(fov.transform.eulerAngles.z, -fov.angle / 2);
        Vector3 viewAngle02 = DirectionFromAngle(fov.transform.eulerAngles.z, fov.angle / 2);

        Handles.color = Color.yellow;
        Handles.DrawLine(fov.transform.position, fov.transform.position + viewAngle01 * fov.radius);
        Handles.DrawLine(fov.transform.position, fov.transform.position + viewAngle02 * fov.radius);

        if (fov.canSeePlayer)
        {
            Handles.color = Color.green;
            Handles.DrawLine(fov.transform.position, fov.playerRef.transform.position);
        }
    }

    private Vector3 DirectionFromAngle(float eulerY, float angleInDegrees)
    {
        angleInDegrees += eulerY;

        return new Vector3(Mathf.Sin(angleInDegrees * Mathf.Deg2Rad), Mathf.Cos(angleInDegrees * Mathf.Deg2Rad), 0);
    }
}```

glacial juniper Jun 8, 2022, 11:02 AM

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But u want to work in 3d or in 2d?

spiral wren Jun 8, 2022, 11:03 AM

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3D, but seen from the side

glacial juniper Jun 8, 2022, 11:04 AM

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the easiest way was to convert the field of view to 3d

spiral wren Jun 8, 2022, 11:05 AM

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the fov used to be in 3D, but since its a sidescroller I didn't really need it to check for things in the Z direction

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so how it works now is how I want it to work, I just cant get the angles right

glacial juniper Jun 8, 2022, 11:06 AM

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hmmm okok

full shard Jun 8, 2022, 11:07 AM

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honestly I can't even tell where "forward" is for the red object (if that is an enemy)

spiral wren Jun 8, 2022, 11:08 AM

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rotation is 0 0 0, so forward should be Right

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and yes the red object is the enemy

glacial juniper Jun 8, 2022, 11:13 AM

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if u invert the direction of the angle give by DirectionFromAngle

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dont work?

spiral wren Jun 8, 2022, 11:14 AM

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whats the best way to invert the angle?

glacial juniper Jun 8, 2022, 11:21 AM

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https://www.youtube.com/watch?v=rQG9aUWarwE

YouTube

Sebastian Lague

Field of view visualisation (E01)

In this miniseries (2 episodes) we create a system to detect which targets are in our unit's field of view. This is useful for stealth games and the like.

Source code + starting file:
https://github.com/SebLague/Field-of-View

Support the creation of more tutorials:
https://www.patreon.com/SebastianLague
https://www.paypal.me/SebastianLague

▶ Play video

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check this video

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it's the same that I used some moths ago

spiral wren Jun 8, 2022, 11:26 AM

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i'm so close to making the script I have work, so would be great to sort it out 🙂

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thanks for your link though!

glacial juniper Jun 8, 2022, 11:28 AM

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spiral wren i'm so close to making the script I have work, so would be great to sort it out ...

the videois what u want

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If I understand well

full shard Jun 8, 2022, 11:36 AM

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when you rotate it along the vertical axis do the yellow fov indicators rotate smoothly around the circle in the expected direction?

spiral wren Jun 8, 2022, 11:36 AM

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yes

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or no

full shard Jun 8, 2022, 11:37 AM

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and when it starts by facing right, you would expect the yellow indicators to point right as well? (so long as angle < 90)

spiral wren Jun 8, 2022, 11:37 AM

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hold on

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yes it rotates smoothly

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Z rotation is -90 there

full shard Jun 8, 2022, 11:41 AM

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wait, don't you want to base it on Y rotation tho?

spiral wren Jun 8, 2022, 11:42 AM

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... ah

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I think you found an issue 😉

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I set it up in the wrong rotation from the start

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but the ground is 0 0 0 rotation

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im confused

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sry im super new to this

spiral wren Jun 8, 2022, 12:01 PM

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ok if I set the rotation to 0 90 90 I get exactly what I want but inverted

full shard Jun 8, 2022, 12:14 PM

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the FOV detection was actually flawless (though I forgot to mask & tag player properly and was wondering wtf was going on for a while), it was just the editor script that needed changing

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using UnityEditor;
using UnityEngine;

[CustomEditor(typeof(FieldOfView))]
public class FieldOfViewEditor : Editor
{
    private void OnSceneGUI()
    {
        FieldOfView fov = (FieldOfView)target;
        Handles.color = Color.white;
        Handles.DrawWireArc(fov.transform.position, Vector3.up, Vector3.right, 360, fov.radius);

        Vector3 viewAngle01 = DirectionFromAngle(fov.transform.eulerAngles.y, -fov.angle / 2);
        Vector3 viewAngle02 = DirectionFromAngle(fov.transform.eulerAngles.y, fov.angle / 2);

        Handles.color = Color.yellow;
        Handles.DrawLine(fov.transform.position, fov.transform.position + viewAngle01 * fov.radius);
        Handles.DrawLine(fov.transform.position, fov.transform.position + viewAngle02 * fov.radius);

        if (fov.canSeePlayer)
        {
            Handles.color = Color.green;
            Handles.DrawLine(fov.transform.position, fov.playerRef.transform.position);
        }
    }

    private Vector3 DirectionFromAngle(float eulerY, float angleInDegrees)
    {
        angleInDegrees += eulerY;

        return new Vector3(Mathf.Sin(angleInDegrees * Mathf.Deg2Rad), 0, Mathf.Cos(angleInDegrees * Mathf.Deg2Rad));
    }
}

spiral wren Jun 8, 2022, 12:46 PM

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ok so you changed it back to 3D

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I dont really need a depth radius since its a sidescroller

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Its actually working as i want when setting the rotation to 0 90 90 and the player is looking to the right

spiral wren Jun 8, 2022, 1:18 PM

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ok I got it working, needed to change it to DirectionFromAngle(fov.transform.eulerAngles.y

#So I could use some input on a enemy