How to continue projectile's movement after hitting a surface

Development Programming & Scripting Blueprint
, , ,
1

you want thing like ricochet ? if you use movement component for your projectile, it have value for you if you want bullet bounce.

2

ok, then when hit you need calculate the next velocity of your bullet then just AddImpulse with true for velocity change.

3

Hi. My projectile must continue its movement after hit event at some conditions. How to relaunch it if it has stopped?

4

Yes you are right. I know about bounce params, but in my case bullet should bounce at some angles and pierce the object at other angles

5

Not working. Projectile stops anyway

6

Hi FiftyStars,

Here is a tutorial on how to create a ricocheting line trace. Even if it canā€™t be adapted to your projectile, it may give you some ideas.

7

Hi, i know how to calculate trajectory. I dont understand how to re launch projectile after it was stopped by the wall

8

Hi,

ProjectileMovementComponent has category Projectile Bounces. You should check property ā€˜ShouldBounceā€™ to continue projectile moving. In addition, you can use Bounciness parameter to control bounce direction or you can use Event Hit to update projectile moving direction. If ShouldBounce is unchecked after first hit, projectile simulation will stop.

Hope it helps!

9

Hey, Iā€™m trying to do something similar to you and I have to ways so far but none of them are perfect.

The first one requires physics so you need to enable them on your collision component (check Simulate Physics). This allows you to add impulses and force to your object. The problem is that your object will spin around so if you use get control rotation and get forward vector it might not have the results you want. I still donā€™t know how to fix that so if anybody has an idea Iā€™ll be really interested in hearing it.

The second solution I tried didnā€™t involve physics. I guess that you have a Projectile Movement component in your projectile. Just get that and call set velocity. As for the value, just get the Control Rotation ā†’ Get Forward Vector and multiply that by some float value and then plug it into set velocity.

10

Hi. Iā€™ve ā€œsolvedā€ my problem by creating projectile without projectile movement component. Implementing movement is easy. Bouncing - a bit harder but still real. The best thing is that i can manually start/stop its movement.

11

Could you elaborate a bit on how you did this? Thank you.

12

I appreciate the answer, but I am wondering if you can expand exactly on how you came up with this solution. Im guessing each frame you add an impulse in the forward vector? How did you implement the bouncing and gravity? Thank you in advance

13

I dont know how ā€œgoodā€ it was, but i have just created my own projectile system. A bit of gravity, a bit of bouncing, a bit of acceleration/deceleration and some other things to make it similar to projectile movement component with a bit different behaviour

14

Yes, it is attached to tick event.
Its just physics. Its hard for me to answer to you, because english is not my native =D This is simple physics + geometry

15

Iā€™ve found a solution to do this in blueprints only.

  1. Make actor with ProjectileMovementComponent AS VARIABLE

  2. Add ProjectileMovementComponent in construction script

  3. Detect hit you want to ignore - set ignores for components of both actors

  4. Destroy ProjectileMovementComponent and add a new one like this:

87781-projectilereset.png
87781-projectilereset.png1364Ɨ309 84.5 KB

Note that ProjectileMovementComponent should have autoactivate set true for this to work smoothly

1 Like
16

This is exactly what I was looking for. Thanks.

17

Theres another option to do this if you donā€™t want to destroy the component, but its a bit of a hack. In cpp code i found that on hit projectile component has active component variable cleared. You can reinitialize this with setactivecomponent blueprint block. After this you only need to set the velocity to make it fly.

18

Hello,

I have done this myself, it is quite complicated to make it very good, I followed a tuturial from a youtuber called MipGames, and i think that tutarial is almost perfect. Link down bellow.

Part 1: Unreal Engine Tutorial - Bullet Physics / Projectile Physics and Penetration Part 1/5 - YouTube
Part 2: Unreal Engine Tutorial - Bullet Physics / Projectile Physics and Penetration Part 2/5 - YouTube
Part 3: Unreal Engine Tutorial - Bullet Physics/Projectile Physics and Penetration Part 3/5 - YouTube
Part 4: Unreal Engine Tutorial - Projectile Physics part 4/5 - YouTube
Part 5: Unreal Engine Tutorial - Projectile Physics part 5/5 - YouTube

19

Digging through the code, I found the following function:

void UProjectileMovementComponent::StopSimulating(const FHitResult& HitResult)
{
	SetUpdatedComponent(NULL);
	Velocity = FVector::ZeroVector;
	OnProjectileStop.Broadcast(HitResult);
}

So all you have to do to restart a ProjectileMovementComponent should be to reset the UpdatedComponent and Velocity. Itā€™s probably a good idea to call Activate on the ProjectileMovementComponent as well to make sure the ProjectileMovementComponentā€™s Tick is still enabled.

1 Like
20

In case anyone needs different approach, the way our team did was to make a projectile overlap an obstacle. If itā€™s supposed to bounce, change normalized vector of the projectile when OnBeginOverlap fires. If itā€™s supposed to penetrate, just let it go. If itā€™s supposed to be blocked, use Stop Movement Immediately.

2 Likes