# Questions tagged [projectile-physics]

The motion physics of the objects sailing through the air, ranging from thrown baseballs to battleship cannonfire to falling rocks.

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### Model path of bullet to hit future position of balloon

I am coding a Bloons Tower Defense Game and one of the problems I have is how to shoot a projectile from a tower and have it hit a balloon that is moving along a certain path. The way I am currently ...
1 vote
68 views

### Aircraft simulation

Trying to get a "semi" realistic aircraft simulator. I'm pulling my hair out because I just can't get the math right. I'm not looking for super realistic but want to at least get some ...
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### Projectile Aim Prediction with Target Acceleration and Bullet Deceleration Varying with Angle

I previously asked a question about this topic here, and now I'd want to review if the offered solutions worked, and then frame a new inquiry based on the difficulties and issues that resulted. So my ...
101 views

### Intercept an accelerating object with a constant velocity projectile

I want to calculate the time that it takes to intercept a moving target "plane" with a projectile. For example I have two 3 dimensional vectors (2 locations in 3D space). ...
75 views

### How to make a capsule Rigidbody player "kick" a Rigidbody sphere (ball) in Unity?

I am just learning the basics of physics simulation with rigidbodies. I am trying to simulate some basic real world functions like kicking a ball. Let's say I have a simple capsule mesh/collider as my ...
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### How to find the maximum distance a target point can be hit from a launched projectile

I'm determining a trajectory necessary to hit target B with a projectile launched from point A with a given velocity. No problems there. Obviously, not all points B can be hit with a fixed velocity, ...
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1 vote
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### How can I predict if a Guided Projectile can hit a stationary Target (with no adjustments to aim)?

I'm trying to predetermine if a projectile will hit a target (before the projectile has been fired). The projectile settings include an Initial Speed, Acceleration, Max Speed, and a Turn Rate. I'm ...
47 views

### Calculating time taken for projectile to reach height (y) and position (xz) at that time in 3D space

I am trying to calculate, given a Rigidbody and a float height, at what time will the ...
101 views

### How to make mouse pointer be the vertex of a drawn parabola when estimating the trajectory of a projectile?

I'm trying to remake an old flash game using Unity. The main mechanic of the game is to make the basketball pass over the mouse. Here's a video of the game: https://www.youtube.com/watch?v=6sArMC1l_Sc ...
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### Predicting angle of projectile trajectory

I'm making a game, where the player and AI shoot projectiles. Projectiles have their own speed, drag and gravity modifiers. I update my projectile velocity in FixedUpdate (I use Unity engine). ...
25 views

### Add some randomness to the velocity when a ball bounces using UProjectiile Movement Component

I've just started to learn Unreal Engine 4.26.2 with C++. I’m developing a clone of Arkanoid and I’m using UProjectile Movement Component to move the ball. When the ball hit something it always ...
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1 vote
121 views

### Simulating a rocket out of control in Box2D

In the void of space, a spaceship releases a rectangle shaped space-torpedo. In half a second, it starts its rocket engine and goes straight until something get in its way, and then boom! The code ...
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1 vote
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### How can I calculate initial X and Y velocity given the starting coordinates, target coordinates, friction and duration? (No gravity)

I am really new to mixing physics and game development, and I would like to find the initial velocity required to launch the gray dot from point A to point B, given a time. I’ve tried many tutorials ...
91 views

### How do I make a bomb sight accurately?

On the Bombsight Wikipedia page, I get that equation. I do not understand it very well. How would I go about writing that in C#? The drag doesn't matter in my project. It's not a flight sim. I know ...
1 vote
92 views

### How could I simulate projectile collision agaisnt RTS units with primitive colliders?

For example, humans are easy they are just capsules. But for cavalry, an arrow could hit the horse or the rider. Right now cavalry are also capsule colliders for unit-unit collision, but for ...
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1 vote
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### How to make a catapult work with physics and colliders?

This should be my final question regarding getting a catapult to throw something in unity. On my last question, someone suggested starting with something simpler (which I apologize for not doing ...
18 views

### Colliders stop working when they move [duplicate]

I'm trying to make a game where you play basketball as a catapult. Obviously an idea like this leans heavily on the unity physics engine. The cup of the catapult has a bucket on it to keep the ball ...
1 vote
192 views

### When an object is launched off-screen, is there any way to know if it's coming back?

In this scene, the object becomes invisible and then comes back In this scene, the object becomes invisible but does not come back Is there any way I can tell if an object will come back when it ...
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### Calculate hockey puck bouncing off rubber bumper

I am very new to game development (or any type of development for that matter) and I am trying to figure out how I would calculate a hockey type puck bouncing off a rubber bumper placed at a 45 degree ...
144 views

### Interpolation on Rigidbody2D not working

I'm trying to achieve smooth movement for a ball. I seem to be failing to achieve this and now I've created a sample scene, which shows my setup from the game and the problem exists in that sample ...
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56 views

### The farther I move my character, the more its projectiles fire in the wrong direction

I'm making a top down shooter, and the movement is working fine. However, I'm having trouble getting my Fire function to work correctly. When I run the game, it kind of fires in the right direction, ...
23 views

### Strange momentum on projectiles shot out of "parent" object

I'm trying to shoot a projectile out of a moving "parent" object. Both objects move off of rigidbody physics, so I'm using addforce for the projectile. Whenever I move the "parent" ...
226 views

### How to calculate trajectory on a planet with drag factor

I'm curious what is the valid calculation of a projectile trajectory in case when: surface is not flat but spherical like a planet drag is enabled (for example 0.1) and we are in 3D I've found ...
376 views

### Find projectile initial velocity, and air time, given projectile elevation, distance, angle

I have a target X position (D). I have a turret Y elevation (E). Turret is always pointed at 45 degrees (A). I need to calculate the initial projectile velocity required to hit the target, with an ...
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### How to predict where the soccer ball should be intercepted by an AI player after being kicked?

This question has been asked many times before, but most of the answers give solution to the problem where ball (target) is assumed to be moving at a constant velocity. In my scenario, I'm making a ...
428 views

### How to create a projectile path in unity using physics

I want to create a jump function that launches a RigidBody2D along a low, long, trajectory. In the following examples, I have set the linear and angular drag to 0, to eliminate any possibility of ...
699 views

### Optimize spawn & destroy? (Unreal Engine)

I'd really like to know how you'd go about optimizing this? 20 actors each spawning 8 projectiles per 0.1 sec which are then destroyed 0.8 seconds later, all done through blueprints Gif: https://gyazo....
292 views

### My bullets won't bounce in Unity?

I wanted bullets to bounce when they hit walls. However when colliding with a wall, they just jitter about on them. I didn't want to create a new physics material as I want to keep the ball moving at ...
28 views

### How do I calculate the required force to launch an object? [duplicate]

I want to use a rigidbody AddForce() method on an object to launch it over from the enemy to the player, like throwing a ball at a target. The problem is, I'm not ...
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### Rotating projectile in direction it is moving

I am using a parabola curve to launch my arrows: ...
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### OnTriggerEnter works...sometimes

I was working on a small game in which you shoot projectiles towards various targets, now I decide to use OnTriggerEnter instead of OnCollisionEnter because OnCollisionEnter adds a slight force to the ...
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1 vote
105 views

### Apply impulse in direction line is pointing with force proportional to the length of line

I have a line perpetually pointed at the mouse and originating at the player, but the length is limited to a certain value. I also can create a circular object on demand in Box2D (specifically the ...
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### How can velocity be normalized after a collision if a projectile needs to maintain its height?

I want a thrown disc to travel along the same height, even after collisions. The problem is, there's an edge case that I'm not sure how to deal with. The lowest-tech solution would probably be to ...
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1 vote
771 views

### Emulating 3d trajectory in top-down 2d game?

As the title suggests, I am wondering if it's possible to emulate a 3d arrow trajectory to a top-down 2d game? If you would look at this clip of Age of Empires 2 game, especially when archers are ...
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129 views

### AddForce results in stuttering movement

I'm currently developing a simple breakout/arkanoid mobile game. Now, I noticed that my ball movement is noticably stuttering. I've read various approaches about how to make the ball move and decided ...
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### How do I account for the velocity difference between a ship and it's fired projectile?

In my project, I have a ship that moves and increases it's movement speed with respect to time and how long the acceleration button is being pushed(just like the way a real life car works), now as ...
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### Shoot projectile same direction weapon faces

I want to be able to shoot a projectile from a weapon mounted on a vehicle. Right now I am able to do it but only in front of the vehicle. I managed to rotate the weapon to the direction the mouse is ...
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1 vote
58 views

### How to vary the initial velocity of a jump based on hold time?

What I want to do is, the longer player holds the screen, the longer distance the object will jump when they release the hold. Here is my code: ...
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1 vote
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### Find the direction a Projectile should be fired from a Moving Object to hit another moving Object?

I am trying to do a simple AI Controller, which fires Missiles at the surrounding targets in the Scene. The AI Controller can fire projectiles when moving or stationary. The Targets are either ...
2k views

### How to make a smooth projectile in roblox?

I am trying to make a projectile (Energy ball) for my game. I am using body velocities, but the issue is is that it seems laggy. I shoot it then half a second through flight it seems to stop in mid ...
437 views

### What is a "Projectile"?

I don't know what a Projectile os. I'm not sure whether a Projectile is a spawn point which spawn a number of object or a number of multiple objects. I'm referring to this website. How do I use ...
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1 vote
524 views

### How do I launch a ballistic projectile to hit a moving target, given: launch position & angle, target position & velocity?

This problem is in 3D space. My question is: How do you find the initial velocity of a projectile that flies under constant gravity, so that it hits a target moving with constant velocity, given the ...
33 views

### Why is not the projectile going toward the target?

I have a project where I can shoot (with a simple projectile). Character Blueprint (generate projectile): However I would like to be able to make the projectile go towards a specific target. ...
239 views

### help with shooting projectile along a curve path

so i been trying to find a way to shoot projectiles along a curve path . and i found this tutorial on youtube which was really good. i also uploaded the project in case you wanted to check it out. ...
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1 vote
1k views

### Draw trajectory arc predictor in game

I found this tutorial on youtube and it works pretty well, but I want to add more to it. How can I draw a smooth arc path in the game view (right now the path is only visible in the editor)? Here ...
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### Bullet Projectile Verticle Rotation

I'm very new to C# and Unity, and have been working on a projectile based weapon, and for the most part it's been working well. However, although the bullet fires facing the direction it's being shot ...
2k views

### Javelin throw projectile motion

I am trying to simulate throw of javelin using projectile motion. The basic physics of projectile motion of a point was used to position the javelin. For the rotation part, I just assumed that the ...
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### Pushing Rigidbody forward doesn't go straight

I have a object that pushing rigidbody forward when it's instantiated: ...
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1 vote
464 views

### how to calculate initial Y velocity required to reach target?

I am trying to calculate the y velocity necessary for my player character to jump up and reach a y position within 1 second. Given that my game engine is at 60fps, I am doing: ...
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