How to use Unity3D Raycasts - Detecting shots, selecting with the mouse, & detecting line of sight

Check out the Course: bit.ly/3i7lLtH
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Learn how to use Raycasts in a Unity game to do shot detection, line of sight checks, or even object selection. You'll see how to use layers to filter objects and only select the correct ones and we'll go through a few different samples of Physics.Raycast and Physics.Raycastall.
More Info: unity3d.college
Join the Group: unity3d.group
Patreon: / unity3dcollege

[@ViciousProgressor]

I really appreciate the way in which you explain topics. You don't just give information about a single use case such as 'how to shoot an enemy with raycasting' as most tutorial formats do. Instead, you get to the root of a behavior and break down the basic functionality of it, then show various scenarios in which it may be used and how one would go about modifying code to suit those situations. Your videos allow the viewer to come away with working knowledge rather than scenario-based instructions. Thank you very much.

[@PugTheOrphan]

Love your unity videos!!, im learning unity little by little and i watch all your videos for inspiration for stuff to try out myself! Thank you for doing this for all of us!

[@showemimoomobolanle9839]

You are the best tutor have being having this problem on Ray other tutorials we're not helping just five minutes watch into this video and u solved my problem Tanksssss❤️❤️❤️❤️

[@illsaveus]

OMG you are amazing. That layermask confused with distance problem took an hour out of my life and you just saved me dude. I always love your videos, you are such a treasure

[@KyleRebstock]

Hey, I just started game development 3 weeks ago. I've got to say this was awesome! I've subscribed and turned on the notifications. Hope to see you soon on your next videos!

[@boringNW]

Hey Jason, you've been an extremely great help throughout my couple of attempts at getting off the ground! I can't quit you!

[@alalmalal]

@Jett Kasen WOW REALLY

[@rashidfarhan6223]

I knew how to use raycasts, now I know more!! Thanks Jason!!

[@TanaJansanit]

dude.. just wanna say thanks.. honestly I was stuck with my Raycast for a few days now. searched the internet, watched tons of video but everything seemed fine. after trying everything, I thought ok.. maybe I really am just a noob and need to relearn how the raycast work. Sat down watched your video not expecting to find an answer after going through so many.. than Bam.. the 23:00 mark is when I realized I had set my LayerMask as max distance.. I never face-palmed myself so hard. So just wanna say Thanks a ton, love that you point out mistake that people do cos that's how I find my mistake.. You've earned a new Sub. :)

[@90simissthe]

ray casts have been tripping me up for a while now this is great.

[@spiral9316]

Yeah, Ray cast was definitely on my reading this week

[@rajashreedeshpande8613]

Bro You Explain it the best , I want to watch it again and again and again

[@suatozcan1813]

Great! Super simple and enourmously useful.

[@louisforlibertarian]

Thank you for the tutorial, really helped my project!

[@idorado4]

Nice video Jason!

[@Pref4n]

Top Tier explanation as always 👍

[@Seathen]

Hi ! Love your videos, they are so useful I learned a lot ! For this one the "Sphere Collider" was not working, I had to use a "Mesh Collider", not sure why. Thanks a lot !! :)

[@sudampatil3466]

Nice implementation

[@jimmyhowejr]

Thanks, best tutorial on this ! Was looking for a while. Would be nice to see how to unselect objects when the ray cast leaves the object.

[@jefflynch]

Very useful tutorial. Thanks!

[@hernandonj]

Wonderful video. Thank you!

[@uditkalra6586]

great tutorial, thanks for uploading.

[@maddehaan]

A must see for starting Unity developers and people like me, who have shied away from raycasts for far too long.

[@carltonsaaa]

Great video, ty for sharing.

[@durangogames4146]

Super helpful, thanks!

[@LMonty10]

Super interesting and helpful

[@diliupg]

Your KZbin videos are much much better than some course videos on Udemy. Why don't you do a course there. I subscribed to you sometime ago and never have I got such useful info in each email. Thank you and may you be well!

[@The28studio]

Udemy is the worst.

[@LabGecko]

Udemy even rips videos off of KZbin and puts them on their site with a price. I don't know how they haven't been sued into bankruptcy.

[@maxfun6797]

Udemy tutorials are geared towards beginners, and they have to explain every line of code but with this we need to know code. Udemy is not a bad resource, they have very high quality material there. But Jason is incredible and goes well above high quality, so this is better than Udemy w/o a doubt.

[@miriapodel2367]

This was Epic

[@paulrobinson5490]

Nice Vid, very useful topic. Any chance you can continue with your 3rd person shooter tutorial, maybe include climb wall ladder, that was an excellent series, thanks for your efforts

[@The28studio]

Raycasts are usefull and fun to work with , there's another type of raycasts you may wanna make video about :overlaping Sphere/box

[@LabGecko]

Isn't that a collider, not a raycast? Or is docs.unity3d.com/ScriptReference/SpherecastCommand.html actually casting rays?

[@alifaisal8942]

Awesome! Like it, thanks...

[@mridulagrawal3435]

thanks a lot dude

[@spiral9316]

Hey man, just want to let you know. I appreciate what you do, for us the ones that care like this 😎 Like cool-good. Would i like to see more raycast?, yeah!. Primarily about how to use with navmesh ,as in a quick RTS implementation, example ; Click on map and it assigns coordinates. That coordinates the units npc should follow. it would be nice to see you teach more Ray cast uses, briefly on ui, and as extra in a weapon system like the nightmare 2014 unity demo like how to do the things that are - light rays -i think were called Would be nice to see that implementation, Like how that line is rendered, the line Wich followed the physics Ray cast i think it's more performant than real bullets . im just starting so i Rather study by myself alot and then ask for advice so really, im just thank full, and as you asked what we would like, that is what i would like to see, specially imitating bullets with light rays (instead of instating bullet prefabs) this is very comprehensive, the overload part its really good recommendation. Regards

[@random_precision_software]

Any chance of shopping 3d homing missile, my version just circles the target 🎯

[@felipexg4032]

Thanks a lot sir.

[@random_precision_software]

Could you do an update of this video but checking the ratcast on the spheres instead?

[@TheRiggedDev]

Very Cool

[@wholebitmedia]

I have set up a 360 degree Dot range to Euler 2D conversion system which tell the characters in the game whether some other characters placed in an array wether they are in front/back and right/left of the source character. I did this as a start to autonomous reactions. Created it a while back thinking it would be clever rather than handling/setting up a lot of raycasts. Do you think this would be performant over a similar system setup with raycasts. Would raycasts be messier or perhaps some hybrid using a spherecast...blah blah.

[@MathsPlusGames]

I keep trying to give this a thumbs up, only to realise I have already done so!.

[@victor1102]

I don't get what is wrong with the last one, what happened to the layermask error? Thanks!

[@unitysolutions5100]

I have never been happy with method overloads and I have been using them since the early '90s. Rider can display the parameter name, but I prefer self-documenting code. Fortunately with C# there is a solution with method parameter naming. Physics.Raycast(ray, maxDistance: 10, layerMask). You can even flip the order as long as you name everything to the right. Physics.Raycast(ray, layerMask: layerMask, maxDistance: 10).

[@aronaron5458]

Any time i hear the intro i feel like im about to start a game of assassins creed in 2009

[@RaidenHeaven]

So if you want to use a lazer that goes through enemies but not through walls, you first use a Raycast to cast a ray with a "Wall Layer" to get the distance. Then cast a RaycastAll with the distance you found from the first Raycast. Also they Raycast it's call as an Update and it doesn't triggers the Physics, so having a method to call on the enemy would be nice. Like, having an interface on the enemy with a method and have the enemy game object to deal how it should react at the hit. Also OnTriggerEnter is called before FixedUpdate, meaning you have have FixedUpdate to deal with attacks and getting hit to keep everything in sync. ( If I am wrong PLEASE!!!! Current me on that!)

[@SteveTheExploiter]

I love your videos. Can you expand raycasting to detect steps, knee walls, walls, and cliffs? Explain where to ray cast from on your character? Thank you.

[@The28studio]

what do you mean ?

[@SteveTheExploiter]

@@The28studio When your character approaches a step, it needs to lift it's foot higher than the animation normally would (using IK). Also, if your character jumps a fence, is there ground on the other side where you trigger the landing state or.... is there a deep valley where you would trigger the ragdoll state and disable player input while the character falls to it's death(!). You have to raycast down in front of the character to check for a solid object to "land" on. I'd like to see how that can be done efficiently since my world is going to have a rather large player count. I have a feeling the detection is going to have to be done server side tho.

[@karenhovhannisyan9193]

nice

[@danielgondos3689]

Hi, i used this raycasting in my little project. Went fine until i decided to build it. Basically raycasting is not working in the built version. How can I solve this?

[@danielgondos3689]

Hah! Found the solution. This cameracheck was the problem. If i understood right ScreenPointToRay have implemented main camera already. This cameracheck caused some warnings, and for some reason stopped the raycasting in the final build. Im a newbie in gamedev, so im really happy i solved it :3

[@T0xIcNigHtMarE]

Is it just my headphones or is the audio not synced up to the video? Im getting a lag

[@ggjosh3296]

Cinabutts it drifts a little in the beginning of the video and is corrected later. :)

[@owenpeery2788]

I know this 4 years old, but I had a question just in case you still monitor comments on this, let's say you have a rectangular area where enemies spawn normally, and when the boss appears, you now have an additional round area around the boss where even more enemies appear, but if the boss moves close to the edge of the rectangular boundary , it's circular spawn area goes outside the boundary, so now enemies spawn outside the original rectangular area, could you use raycasts to check to see if the spawn location of the new boss enemies would fall outside the rectangular area before instantiating them into the scene? If so, then don't instantiate them, if not instantiate them. I could put a collider on the fence that marks the rectangular boundary where enemies should spawn inside of. I thought I could write a description that makes sense, but maybe it doesn't.

[@Unity3dCollege]

Bounds.contains (on the colliders bounds) or a Boxcast should do what you're looking for. I'll go with thr bounds check though, it's simpler and faster and should get the job done. If the position isn't in there, just try another one until you get one that's in both

[@montz1757]

can you make a UE4 College channel? xD

[@ravi-mx1to]

Yes nic I have

[@thedude4039]

0:12 How specific. How enlightening.

[@mohokhachai]

Mystical debug gizmos 😢