# How can i shoot at the center of my crosshair? C++ **URL:** \ **Category:** UI\ **Tags:** crosshair, thirdperson, tps, unreal-engine, question, CPP\ **Created:** [October 18, 2017, 8:45pm UTC](https://forums.unrealengine.com/t/how-can-i-shoot-at-the-center-of-my-crosshair-c/407348 "2017-10-18T20:45:28Z")\ **Posts on this page:** 15\ **Page:** 2
**Author:** ![Anonymous\_e5d5c0bf7d300728867097ff79906dbe](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Anonymous\_e5d5c0bf7d300728867097ff79906dbe](https://forums.unrealengine.com/u/Anonymous_e5d5c0bf7d300728867097ff79906dbe)\ **Post date:** [October 20, 2017, 1:53am UTC](https://forums.unrealengine.com/t/how-can-i-shoot-at-the-center-of-my-crosshair-c/407348/21 "2017-10-20T01:53:24Z")
Sure, if you will get stuck too much I will post an example code snippet for you. It is a great habit to try and solve things by your swlf before asking! I respect it šŸ™‚ ---
**Author:** ![staticvoidlol](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@staticvoidlol](https://forums.unrealengine.com/u/staticvoidlol)\ **Post date:** [October 20, 2017, 1:56am UTC](https://forums.unrealengine.com/t/how-can-i-shoot-at-the-center-of-my-crosshair-c/407348/22 "2017-10-20T01:56:40Z")
Itā€™s all for the digital karma! šŸ˜› ---
**Author:** ![Anonymous\_e5d5c0bf7d300728867097ff79906dbe](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Anonymous\_e5d5c0bf7d300728867097ff79906dbe](https://forums.unrealengine.com/u/Anonymous_e5d5c0bf7d300728867097ff79906dbe)\ **Post date:** [October 20, 2017, 2:02am UTC](https://forums.unrealengine.com/t/how-can-i-shoot-at-the-center-of-my-crosshair-c/407348/23 "2017-10-20T02:02:21Z")
Which is quite useless, you canā€™t even make a bounty here (Or can I ? ) ---
**Author:** ![staticvoidlol](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@staticvoidlol](https://forums.unrealengine.com/u/staticvoidlol)\ **Post date:** [October 20, 2017, 2:12am UTC](https://forums.unrealengine.com/t/how-can-i-shoot-at-the-center-of-my-crosshair-c/407348/24 "2017-10-20T02:12:22Z")
As your self-appointed medical professional I am instructing you to get some rest right now :P. But yeah, Iā€™m interested in hearing more about your Bounty System proposal (wouldnā€™t that be GameDev consulting though?) in any case I have a strange compulsion in trying to reciprocate a small slice of what I think Iā€™ve gained with the IP that Epic has made available for free. (I promise I donā€™t work for said company (or even in game dev at all) lol). ---
**Author:** ![Anonymous\_e5d5c0bf7d300728867097ff79906dbe](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Anonymous\_e5d5c0bf7d300728867097ff79906dbe](https://forums.unrealengine.com/u/Anonymous_e5d5c0bf7d300728867097ff79906dbe)\ **Post date:** [October 20, 2017, 2:19am UTC](https://forums.unrealengine.com/t/how-can-i-shoot-at-the-center-of-my-crosshair-c/407348/25 "2017-10-20T02:19:46Z")
Oh bounty is like in stackoverflow, if you have a question that noone answers for more than 2 days, you can offer a ā€œbountyā€ amount of karma for someone who answers the question. It would be a great improvement here - since it is very hard to get an answers especially in C++, it could maybe motivate ppl to answer more. And then the comunity will get happier - because they will get more answers. A lot of ppl tried UE4 posted questions didnt get any answers and went back to Unity. ---
**Author:** ![Anonymous\_e5d5c0bf7d300728867097ff79906dbe](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Anonymous\_e5d5c0bf7d300728867097ff79906dbe](https://forums.unrealengine.com/u/Anonymous_e5d5c0bf7d300728867097ff79906dbe)\ **Post date:** [October 20, 2017, 2:21am UTC](https://forums.unrealengine.com/t/how-can-i-shoot-at-the-center-of-my-crosshair-c/407348/26 "2017-10-20T02:21:08Z")
I think I will go to a night/morning run, and then will back of to sleep. for some reason my working hours are messed up in last couple of months ---
**Author:** ![Varmillion](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Varmillion](https://forums.unrealengine.com/u/Varmillion)\ **Post date:** [October 21, 2017, 5:29am UTC](https://forums.unrealengine.com/t/how-can-i-shoot-at-the-center-of-my-crosshair-c/407348/27 "2017-10-21T05:29:04Z")
Iā€™m trying to solve that. (iā€™m getting some random directions D:) ``` UWorld* World = GetWorld(); FVector2D Viewport; World->GetGameViewport()->GetViewportSize(Viewport); FVector WorldPosition; FVector WorldDirection; const FVector StartTrace = CurrentWeapon->WeaponMesh->GetSocketLocation("MF"); AMyPlayerController* MyPC = Cast(Controller); if( MyPC->DeprojectScreenPositionToWorld((Viewport.X), (Viewport.Y), WorldPosition, WorldDirection)) GEngine->AddOnScreenDebugMessage(-1, 2.f, FColor::Blue, TEXT("Deprojected!")); FActorSpawnParameters SpawnParams; SpawnParams.Owner = this; FVector Destination = (WorldPosition + WorldDirection) * CurrentWeapon->WeaponConfig.WeaponRange; FHitResult Hit = WeaponTrace(WorldPosition, Destination); FVector RotNorm = (Destination - StartTrace); if(RotNorm.Normalize()) GEngine->AddOnScreenDebugMessage(-1, 2.f, FColor::Purple, TEXT("Normalized!")); FRotator Rot = RotNorm.Rotation(); AWeaponBullet* Projectile = World->SpawnActor(ProjectileClass, StartTrace , Rot, SpawnParams); ``` iā€™m doing something wrong? (I have some debug things, like lines. I have removed from this anwser) [PHOTOS](https://imgur.com/a/jnKqT) PS: Range = 3000.0f; ā€œMFā€ = ā€œMuzzle Flashā€ PS2: AHUD Is not working (is not updating my Position and Direction), i did all right, getting and casting my HUD (and I checked if I succeeded on cast), so, Controller is working well. (I also tried divide by 2 the X an Y viewport) and this Hit.Location() ---
**Author:** ![Anonymous\_e5d5c0bf7d300728867097ff79906dbe](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Anonymous\_e5d5c0bf7d300728867097ff79906dbe](https://forums.unrealengine.com/u/Anonymous_e5d5c0bf7d300728867097ff79906dbe)\ **Post date:** [October 21, 2017, 8:50am UTC](https://forums.unrealengine.com/t/how-can-i-shoot-at-the-center-of-my-crosshair-c/407348/28 "2017-10-21T08:50:39Z")
Hi, sorry I am too tired right now, I just took a quick look and found something: if( MyPC-\>DeprojectScreenPositionToWorld((Viewport.X), (Viewport.Y), WorldPosition, WorldDirection)) if you want to get the screen center you have to devide the size by 2 or even better to multiply it by 0.5 šŸ™‚ if( MyPC-\>DeprojectScreenPositionToWorld((Viewport.X \* 0.5f), (Viewport.Y \* 0.5f), WorldPosition, WorldDirection)) P.S. for me the deproject works fine I am on 4.16.3 thoughā€¦ If you canā€™t get the screen size maybe you can try this function const FVector2D ViewportSize = FVector2D(GEngine-\>GameViewport-\>Viewport-\>GetSizeXY()); ---
**Author:** ![anonymous\_user\_f77a82de](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_f77a82de](https://forums.unrealengine.com/u/anonymous_user_f77a82de)\ **Post date:** [October 21, 2017, 3:08pm UTC](https://forums.unrealengine.com/t/how-can-i-shoot-at-the-center-of-my-crosshair-c/407348/29 "2017-10-21T15:08:42Z")
This is a math problem. if youā€™re using blueprint, I donā€™t know if blueprint has said function ---
**Author:** ![Varmillion](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Varmillion](https://forums.unrealengine.com/u/Varmillion)\ **Post date:** [October 21, 2017, 9:37pm UTC](https://forums.unrealengine.com/t/how-can-i-shoot-at-the-center-of-my-crosshair-c/407348/30 "2017-10-21T21:37:19Z")
Yes, Iā€™m trying to improve my math skills ---
**Author:** ![Varmillion](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Varmillion](https://forums.unrealengine.com/u/Varmillion)\ **Post date:** [October 21, 2017, 9:41pm UTC](https://forums.unrealengine.com/t/how-can-i-shoot-at-the-center-of-my-crosshair-c/407348/31 "2017-10-21T21:41:05Z")
Ok, iā€™m not in my home, i will see later. But thanks for giving a look! (I was dividing by two, but forgot to make the \*0.5) ---
**Author:** ![Anonymous\_e5d5c0bf7d300728867097ff79906dbe](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Anonymous\_e5d5c0bf7d300728867097ff79906dbe](https://forums.unrealengine.com/u/Anonymous_e5d5c0bf7d300728867097ff79906dbe)\ **Post date:** [October 21, 2017, 9:56pm UTC](https://forums.unrealengine.com/t/how-can-i-shoot-at-the-center-of-my-crosshair-c/407348/32 "2017-10-21T21:56:11Z")
Multiplying by half nowadays is actually generates the same assembly code, since compilers improved a lot, and actually optimizing divisions by power of 2 I just think that this is still good habbit where you donā€™t much care about precision and care about performance. I will give you a code snippet to get you started in around 2 hours, since I dont know how did you inplement the weapon trace function - there could be an edge case which i will show you. ---
**Author:** ![Anonymous\_e5d5c0bf7d300728867097ff79906dbe](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Anonymous\_e5d5c0bf7d300728867097ff79906dbe](https://forums.unrealengine.com/u/Anonymous_e5d5c0bf7d300728867097ff79906dbe)\ **Post date:** [October 22, 2017, 1:27am UTC](https://forums.unrealengine.com/t/how-can-i-shoot-at-the-center-of-my-crosshair-c/407348/33 "2017-10-22T01:27:02Z")
Hey mate, sorry I am short on time ā˜¹ But I want to point you some edge cases for your trace function: You must check if there was a blocking hit in your trace - if there was so just return the hit location, else you shall return start + destination and it will be the point you will shot at. ---
**Author:** ![Varmillion](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Varmillion](https://forums.unrealengine.com/u/Varmillion)\ **Post date:** [October 24, 2017, 1:11am UTC](https://forums.unrealengine.com/t/how-can-i-shoot-at-the-center-of-my-crosshair-c/407348/34 "2017-10-24T01:11:04Z")
I did it! I analyzed the ā€œstaticā€ code and spawned the project from muzzle to BulletVelocity.Rotation (), the only thing I did not use was ā€œBulletVelocity \* = ProjectileSpeedā€, because I already have a ProjectileSpeed on MovementComponent with an GravityScale value. Thanks a lot you all, i have learned so much with this, and iā€™m trying to improve my math. Thanks for the patience. (A little of OFF, Dindi#6313 my discord if you guys want to talk sometime! (: ) Cheeeeeers! ---
**Author:** ![Anonymous\_e5d5c0bf7d300728867097ff79906dbe](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Anonymous\_e5d5c0bf7d300728867097ff79906dbe](https://forums.unrealengine.com/u/Anonymous_e5d5c0bf7d300728867097ff79906dbe)\ **Post date:** [October 24, 2017, 1:55am UTC](https://forums.unrealengine.com/t/how-can-i-shoot-at-the-center-of-my-crosshair-c/407348/35 "2017-10-24T01:55:31Z")
Hey, great to hear that you solved this :-). I preffer chat apps like skype šŸ˜› you can find me there skype name ā€œroma-mtfdbā€ I donā€™t have an internet connection right nowā€¦ probably will be back in couple of hours. [Previous page](https://forums.unrealengine.com/t/how-can-i-shoot-at-the-center-of-my-crosshair-c/407348.md?page=1)