Targeting Arc in Degrees

Question

Is there some way I can adapt my current script to only fire in a forward facing 250 zone? How about a aft version? So basically I want to check and make sure my selected target is within a 250 degree targeting zone based on the forward section of the ship, if not in arc then abort the firing sequence. I will also need to mod that for a aft one also which shouldn't be to hard. Here is my current script…

 using UnityEngine;
 using System.Collections;
  
 [RequireComponent(typeof(LineRenderer))]
  
 public class BeamArray : MonoBehaviour 
 {
     LineRenderer line;
     public Material lineMaterial;
     bool phaser = false;
     public AudioClip sound;
  
     void Start()
     {
           line = GetComponent<LineRenderer>();
            line.SetVertexCount(2);
            line.renderer.material = lineMaterial;
            line.SetWidth(0.1f, 0.25f);
         line.enabled = false;
     }
     
     void Update()
     {
         var script = GameObject.Find("aaMain Camera").GetComponent<SelectTarget>();
         if(Input.GetKeyDown("space") && phaser == false && script.gui == "yes")
         {
             phaser = true;
             StartCoroutine (pulsetime());
         }
     }
         IEnumerator pulsetime()
         {
             var script = GameObject.Find("aaMain Camera").GetComponent<SelectTarget>();
               line.enabled = true;
             AudioSource.PlayClipAtPoint(sound, Camera.main.transform.position);
               RaycastHit hit;
                if (Physics.Linecast(transform.position, script.selectedTarget.transform.position, out hit))
               {
                 if(script.Shields == false)
                 {
                     print("Shields Down, damage going to hull!");
                        hit.transform.SendMessage("ApplyDamage", 700, SendMessageOptions.DontRequireReceiver);
                 }
                 if(script.Shields == true)
                   {
                       // vector from the target center to the hit position
                        Vector3 hitDirection = hit.point - script.selectedTarget.transform.position;
                        Transform targetTransform = script.selectedTarget.transform;
 
                        float angleForward = Vector3.Angle(hitDirection, -(targetTransform.up));
                        float angleBack = Vector3.Angle(hitDirection, targetTransform.up);
                        float angleRight = Vector3.Angle(hitDirection, targetTransform.right);
                        float angleLeft = Vector3.Angle(hitDirection, -(targetTransform.right));
                        float angleTop = Vector3.Angle(hitDirection, targetTransform.forward);
                        float angleBot = Vector3.Angle(hitDirection, -(targetTransform.forward));
 
                        string shieldHit = "";
                        float minAngle = 180;
 
                        if (angleForward < minAngle)
                     {
                          shieldHit = "ApplyShieldDamageForward";
                          minAngle = angleForward;
                        }
 
                        if (angleBack < minAngle)
                     {
                          shieldHit = "ApplyShieldDamageAft";
                          minAngle = angleBack;
                        }
 
                        if (angleRight < minAngle)
                     {
                          shieldHit = "ApplyShieldDamageStarboard";
                          minAngle = angleRight;
                        }
 
                        if (angleLeft < minAngle)
                     {
                          shieldHit = "ApplyShieldDamagePort";
                          minAngle = angleLeft;
                        }
 
                        if (angleTop < minAngle)
                     {
                          shieldHit = "ApplyShieldDamageDorsal";
                          minAngle = angleTop;
                        }
 
                        if (angleBot < minAngle)
                     {
                          shieldHit = "ApplyShieldDamageVentral";
                          minAngle = angleBot;
                        }
                     
                     hit.transform.SendMessage(shieldHit, 700, SendMessageOptions.DontRequireReceiver);
                 }
             }
             //wait the cooldown time in a loop
             float delay = 1.680f;
             while (delay > 0)
             {
                 //update beam endpoints
                 if(script.Shields == false)
                 {
                     line.SetPosition(0, transform.position);
                      line.SetPosition(1, script.selectedTarget.transform.position);
                 }
                 if(script.Shields == true)
                 {
                     line.SetPosition(0, transform.position);
                      line.SetPosition(1, hit.point);
                     script.selectedTarget.FindChild("Shield Bubble").GetComponent<MeshRenderer>().enabled = true;
                 }
                 //decrement delay time
                 delay -= Time.deltaTime;
                 //let unity free until next frame
                 yield return null;
             }
                 line.enabled = false;
                 phaser = false;
                 script.selectedTarget.FindChild("Shield Bubble").GetComponent<MeshRenderer>().enabled = false;
         }
 }

I am feeling so silly with all my complex questions… lol all just learning...

Answer 1

Best Answer

Answer by undead-steve · Nov 14, 2013 at 01:16 AM

If what your asking is how to figure out if a vector is within a range (ie, +/- some number of degrees from your transforms's local forward, you're already using Vector3.Angle the right way. Something like

 if (Vector3.Angle(transform.forward, firingVector) <= 125)
 {
    //fire
 }
 else
 { 
    // play 'out of firing arc' sound
 }

Seems to be the idea - though you should probably revisit your question for clarity.

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Memige · Nov 18, 2013 at 10:37 PM 1

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Based on your question, Undead-steve's answer looks correct, even after your clarifications. Are you not sure how to implement what he suggested, or is it not what you were looking for?

Memige · Nov 19, 2013 at 01:18 AM 1

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 script.selectedTarget.transform.position - transform.position

will give you the vector from your player to the enemy, thus the firingVector. I would recommend placing it just before you do the ray cast hit check (No reason to do an expensive ray cast if they aren't in firing position) Basically, if they are outside of the firing arc, yield break; to cancel the firing attempt. To do the same thing for firing backward, just reverse the forward vector by doing transform.forward * -1

Memige · Nov 19, 2013 at 03:27 PM 1

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Change

if ($$anonymous$$athf.Abs(Vector3.Angle(transform.forward, script.selectedTarget.transform.position - transform.position)

to

if ($$anonymous$$athf.Abs(Vector3.Angle(transform.forward, script.selectedTarget.transform.position - transform.position))

You had your ')' in the wrong place, and your want 125 because it is going to calculate it off of that amount from the center so 125 to the left and 125 to the right, for a total of 250 arc

Memige · Nov 20, 2013 at 10:21 PM 1

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reset phaser to false just before the yield break

Memige · Nov 21, 2013 at 02:34 AM 1

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Thanks and glad I could help. Would you $$anonymous$$d marking undead-steve's answer as correct? $$anonymous$$y clarifications may have helped you understand it, but he did give the correct answer. And that way people with similar questions can more easily find this conversation chain :)

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Answer 2

Answer by Inkarr · May 06, 2021 at 08:38 PM

@Carbongrip This thread is so old now that i'm not sure how active you still are, but it looks like you were creating something very similar to what i want to do. SFC3 or simiar by any chance?

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Targeting Arc in Degrees

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