How to Add a Field of View for Your Enemies [Unity Tutorial] 

This tutorial has the best thumbnail I've ever seen.

Nothing like a little bit of trigonometry programming in the middle of a friday afternoon. Thanks for the video.

Thank you so much for this tutorial! Really cool use of the gizmos for the FOV and very well communicated!

My kind of tutorial! Clear and to the point without excessive stammering and/or over explaining.

Really enjoyed this tutorial, simple and powerful and Modular! Since doing your fps tutorial really motivated me to try other things and see what I can put together !

I get so drawn into your voice, that i forget that im watching this tutorial to actually learn and just sit through till the end... Getting through one of yours to the point where id be satisfied enough with understanding the concepts took me ~6 rewatches. Great content my man love you

Good programming tutorials are rare, so whenever I find videos like this I appreciate it a lot.

Great tutorial ! I would like to see more videos on custom editors for sure .

Exactly what I was looking for. Great job man, I've tried everything and couldn't make it work, and your video saved me from seppuku.

Actually the best tutorial on enemy AI I have ever seen so far! I've been wondering so long for help on making raycast detection, thanks a lot!

Just what I was looking for, thank you very much. Clear explanation!

Amazing video! Thankyou for holding our hands through this!

Man's out here saving my project with expert guidance, and now I know at least five new things about Unity and C#.

Thanks very much for making this tutorial!! It is really helpful!! Thanks to this tutorial my enemies now have a field of view so they can detect the player more naturally :D

Thanks. This was the most useful tutorial I've watched in a long time.

It took me a minute to get everything working, but this was exactly what I was looking for! Now I just need to combine this with a few other tutorials (Making the enemy walk around, making the enemy walk towards the player etc) and I'll have the logic for my very first game done! Thanks a billion!

DUDE!!! I am making a VR fps with my 11y/o son as a summer project between college and Uni and you just saved me weeks of stress!!

Fantastic tutorial :) I'll definitely be checking out your other videos for more content like this

Excellent tutorial, thank you! It was very easy to integrate into the code I had already written.

Awesome video and clear explanation! Thanks man!

Great tutorial. Very clean and to the point explanation. Would like to add that even it is not main concern of the video but I love the idea to add the editor part as well. Cheers.

Thanks for tutorial, Very simple to understand!!

AMAZING! Thank you for sharing it! Works perfectly good!

Thank you for the video, I used this logic to implement an aim system in my game :)

Just what I needed, thank you so much for this little gem.

This was perfect and immediately applicable for my AI controllers, thank you for posting!

This is beautiful! Thanks for the tutorial!

Damn, thanks, you saved me A LOT of time to build a decent AI visual detection algorithm for my university assignment. Clean and elegant implementation, easy to use (actually it cost me around 2 minutes ahah). Simple but powerful script! You should actually sell it, not joking. Thanks!

This is a 10/10 tutorial. It's not the simplest thing to make, but everything is so well explained and the editor script is the cherry on top of the cake.

Awesome script my man! Thank you!

Hi. This tutorial is really fantastic thanks!

Very well explained. Thank you very much for an excellent tutorial.

Much thanks, been struggling to find something like this ❤

best tutorial on enemy fov i've found

absolutely need videos on custom editor tools with, it would be very useful to watch tutorials with such important topic in your great and simple explanation way.

If anybody wants to know how to deal with multiple objects, here it is ( *in my case "playerRef" is "enemyUnits"* ): void FieldOfViewCheck() { Collider[] rangeChecks = Physics.OverlapSphere(transform.position, visionRadius, targetMask); if (rangeChecks.Length != 0) { for (int i = 0; i

Thanks for doing the maths for me! Such a simple yet super useful tutorial, I appreciate your work.

Works like a charm, thank you!

Thank you so much! You explained it perfectly. Now my enemy AI is finnaly working.

Excited for your game next week!

Really helpfull tutorial, thanks for uploading it

currently using this tutorial for a really strange mechanic xD haha thanks!

thank yu so much, u help me a lot bro. keep it up.👍👍

Thank you so much for nice and clear video!

Thank you for the tutorial, this should help me with designing enemy AI.

Good job! Thanks!

I'm glad i found your channel.

Thanks! It was really helpful! Both for Editors and raycasting! I would love to see Custom Editor scripts in the future! Is there anyway to visualize this angles in game too? So that its like a flashlight of enemies. :)

Great vid! Liked and subbed

Saved my live thank you so much.

Thank you very much! Saludos desde Guatemala.

very nice guide!

MULTIPLE TARGETS CHECK Hi, I don't know if this is 100% correct but it is just my explanation of what was suggested in the video for detecting multiple targets. "FieldOfView" script: 1) Start( ) method: delete/comment out the "playerRef = GameObject.FindGameObjectWithTag("Player");" line -----> this reference is used just in the Editor script for drawing the Gizmo line but doesn't actually have to do anything with the detection of the target. 2) in the FieldOfViewCheck( ) function , as the author said in the video 8:32, the rangeChecks array holds anything that has the targetMask on it and was detected in the radius around your player/character. Then we get one of these detected targets from this array and calculate in what direction this target is and finaly in the if statement with the Vector3.Angle, we calculate if it is in our FOV angle (if it is in the see distance, was automatically calculated by putting targets in our radius in the rangeChecks array). -----> So, here we just have to check this for each of the detected targets in the rangeCheck array. 3) Create a for loop looping through all rangeCheck elements -----> after "if(rangeChecks.Length != 0)" and before "Transform target = rangeChecks[0].transform;". So, we can look at each element in rangeChecks and find out if we see it or not 4) Change "Transform target = rangeChecks[0].transform;" to "Transform target = rangeChecks[i].transform;" -----> So, we are able to calculate stuff for every element in the rangeChecks one-by-one 5) Inside the if statement where we set "canSeePlayer = true", assign the detected target gameObject from rangeChecks to our "playerRef" by adding "playerRef = rangeChecks[i].gameObject;" -----> So, we know we see a player/target/enemy and in the Editor script we can draw the gizmo line 6) add "break;" under assigning the playerRef gameObject -----> this should stop the for loop calculating stuff for the remaining found targets in the rangeCheck[], because we found (at least) one player/enemy/target that we can see. But this doesn't have much impact since it breaks just this one for loop and the next time this method will be called in the coroutine this for loop will run again. Also, this has to be there if you are going to do the remaining steps! 7) Inside the if statements where we set "canSeePlayer = false" write "playerRef = null" there (even to the very bottom else "if(rangeChecks.Length != 0){ }else{...here...}") -----> making sure PlayerRef doesn't hold any gameObject that we don't see anymore. So, the gizmo line is not drawn if there is no player/target/enemy in our sight. Please, read the coments to this (if there are any), maybe I made a mistake or didn't explain something in the correct way. Hope this helps and thank you for the great video, it has significantly improved my project and I learned a lot.

amazing! thank you!

OMG! You saved me! Thank you so much!

good job man!

Very good, I learned a lot from your video, thanks for clarifying how to create a FOV! I have a doubt.. how to detect multiple players within the FOV and choose the closest player?

excellent, thank you

Thanks for the info, Sean Connery.

Thanks you're AWESOME :)

Thanks a ton !

Amazing Thank you

Thanks a lot ! 🙏🙏

This tutorial is better than some unity store assets. why ? 2 reasons: 1)you get to know the "nuts and bolts" of exactly what is going on. 2) and you get the code explained. With a little bit of tweaking, I added my own shooting component and basic health system components. Still trying to figure out how to represent the "fov" during runtime. but thanks !!!

I have a problem converting this Script from 2d to 3d, i changed Vector 3 to 2 and forward to right burt it is still on the wrong axis...

My ai can still see me through walls, it shows the green line going through the walls. I have correctly labled and assigned the correct layer titles. Pls help

Thanks for the awesome tutorial. I followed your coding, and I noticed something. Should it be transform.forward in the angle check?

So followed this tutorial and works mostly, however the distance before player becomes unseen is roughly double the radius

Pretty advaced style tutorial. Just a bit of idea: at fov check, you can avoid the "else" hell spaghetti, if you set the canSee to false 8n the beginning and set again to true at positive check.

I Ecounterred an issue. I'm using the code on a 2D game, just a couple of differences (vector2 insted of 3 and transform.right instead of forward). When the player is really close to the enemy (with pov) but still in the cone of view, canSeePlayer become false. Can anyone help please?

GOLDEN!

nice work, how to use it in case enemy is above or some ledge, and it can see player down or up, i short a 3d cone type field of view mechanic

Ive encountered a problem with this script that doesnt seem to have an clear answer. Whenever my enemy looses sight of my player it just stops and starts to shake in different directions. Like it doesnt seem to find the exact spot my player was on. Another thing is that the enemies path-find perfectly to my player while playing the game in the Unity Editor, but as soon as i export a build of the game, the enemies just kinda randomly decide where to go once the player has been spotted. They dont run off tho, they just kinda waddle around the player.

Helo! I have a problem, I have a bot script already done (shoot and run) but I put the field of view of your video and it didn't work, I use the Nav Mesh Agent to follow the player, I wanted the bot to stay put and if the player stayed within his field of vision, he shoots, can you help me? I thank!

Awesome video!!! Can u make a video about enemy hearing range?

Any way to have a solid color in the radius FOV?

I have an issue, sometimes the script detects the player and sometimes not, plus I had to comment the Editor Script part where player is spotted, as the Handles.DrawLine gives me an error that says: You're pushing more GUIClips than you're popping. Any solution or anyone that has the same problem?

It's detect position of collider but not collider itself. How can I change the script to fix it?

I know its bit silly when just copying the code, but ive messed something up and was spending like 10 minutes looking at this one file of code and some settings, only after forfeiting and going back to your video i realised i had everything setup perfectly, just didnt start the coroutine

Thanks!

Excellent tutorial. Very clear and well communicated. One minor nitpick though: "euler" is pronounced "oil er" rather the "you ler". It's a reference to the Swiss mathematician Leonhard Euler of Euler Identity fame.

Does the physics have better performance over the mesh filter method?

If i didnt know of your FOVRoutine() solution, I would use a function inside of MonoBehaviour::Update(), and make the function start with a if(bool) which gets set to false for x frames after function does its job. Your solution seems just much more clear, if im getting it right.

Hello! I have an AI programmed using this raycast and some path script. The AI works great, but im wondering. Would it be possible to add a searchtime, so when the enemy spots you, and then looses you, he will still go after for lets say 3 seconds? Because when my enemy spots you, and then you hide, he instantly switches to his coded path I have made. Thus making the game really easy(you lose if he catches you) I have tried to add an Ienumerator, but that didnt work.

How exactly can this be tweaked for multiple targets... 8:23 You mention adding a for loop but im unsure of how. I've added a for loop to determine the closest collider from the list of all colliders in range, but it will still only seek one regardless of if its visible. If i have 2 targets the enemy will lock onto the closest targe5 even if its behind a wall. The 2nd target can be entirely visible but will be ignored.

I keep getting "The name 'angleInDegrees' does not exist in the current context" for the FieldOfViewEditor script. Is anyone else running into this problem? I'm using Unity 2021.3

I was nearing the end of this tutorial and my player object is invisible on scene view, I didnt click the eye icon to make it so... big mess i could only assume some part of the scripts i wrote before messes up and modifies my player object transform to make it lose visibility or make it small to the point where i cannot see it, still great tutorial

How would you convert this to 2D?

I don't see the green line even though the bool canSeePlayer is enabled.

Help! I can't export my game with that. How to solve it?

i followed everything but my enemy still doesnt see my character ;-; (i enven checked the FAQ and still no dice)

yield return got me very confused. I would assume return means quit out of this function, but yield return means: pause execution of this code for x amount of frames.

I want to have the enemy remember where it last saw the player, but it cant get it to implement. Can someone help?

i got an error while making the editor script, " 'Handles' does not contain a definition for 'DrawWireArch' "

I dont know why, but the scene ist freezing when my target (Player) gets into the field of view of the enemy...

what's the point of the playerRef?

Hey, can this be applied to 2D??

Thanks you

Are we allowed to use this in titles that we are gonna release??

i copied all the code word tp word, didnt work. I then copied the github link code, didnt helped either, if i dont check "canSeePlayer" myself line to player isnt drawing, and obsticruction isnt working too. Anyone had the same problem?