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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84
votes
15answers
34k views

How are bullets simulated in video games?

I have been playing games like MW2 recently and, as a programmer, I tend to ask myself how do they make the game so immersive. For example, how to they simulate bullet speed. When an NPC fires a ...
21
votes
4answers
21k views

Calculating minimum velocity of the projectile needed to hit target in parabolic arc

If I have a point which I want to hit at the end or during a parabolic arc, how would I calculate the needed x and y velocity?
14
votes
4answers
8k views

2D tower defense - A bullet to an enemy

I'm trying to find a good solution for a bullet to hit the enemy. The game is 2D tower defense, the tower is supposed to shoot a bullet and hit the enemy guaranteed. I tried this solution - http://...
14
votes
5answers
3k views

How to calculate turn heading to a missile?

I have a missile that is shot from a ship at an angle, the missile then turns towards the target in an arc with a given turn radius. How do I determine the point on the arc when I need to start ...
13
votes
3answers
5k views

Projectile Motion - Arrow

In a 2D game, I simply want to draw the trajectory of an arrow in flight. With the code below, the trajectory (the parabola) looks right, but the angle (or rotation) or the arrow isn't. ...
12
votes
2answers
41k views

How can I find a projectile's launch angle?

I am making a 2d game in which units fire arrows at each other. I know the shooter's and the target's position and the initial velocity of the projectile. I want to know the angle the projectile ...
11
votes
3answers
4k views

How can I launch a GameObject at a target if I am given everything except for its launch angle?

I am trying to launch an object at a target, given its position, its target position, the launch speed, and the gravity. I am following this formula from Wikipedia: $$ \theta = arctan \bigg( \frac{v^...
11
votes
2answers
775 views

How do I make good guy attacks only hit bad guys and vice versa?

My game has many different type of good guys and many different type of bad guys. They will all be firing projectiles at each other but I don't want any accidental collateral damage to occur for ...
10
votes
1answer
3k views

Adding air drag to a golf ball trajectory equation

I'm developing a 2D golf game in VB.NET 2005, but I am stuck on how to implement air or wind drag that should affect the ball. Already I have these equations for projectile: \$v_0\$ for the initial ...
10
votes
4answers
1k views

What's the most efficient way to find the intersection point of a missile and a bitmap terrain?

Following up on my earlier question about finding the slope of a 2D bitmap terrain I now need to know the best way of finding the point on the 2D terrain that the missile hit. Obviously, I can see if ...
10
votes
4answers
1k views

Calculating missile trajectory around orbits before shooting

I'm building a game with Unity3D. It's a Gravity Wars clone. Both player and AI turrets shoot missiles at each other (giving an Angle and a Power variables), trying not to crash missiles on planets. ...
9
votes
2answers
621 views

Guided Missile with Constant Time

I'm building a game with players and missiles. I want to fire a missile from P1 to P2. The missile should always take exactly five seconds to reach P2. The missile should also track P2. If P2 moves ...
8
votes
1answer
2k views

How to make an arrow land at a specific position in 3D world space

In my game when I click with the mouse on the terrain somewhere, I'd like the player to fire an arrow to that position in a parabolic fashion. The arrow has a position, acceleration and velocity all ...
8
votes
4answers
2k views

Determing an object's position along a curve over time

I have some objects in my game which are "thrown". At the moment I am trying to implement this by having these objects follow a parabolic curve. I know the start point, the end point, the vertex and ...
7
votes
1answer
4k views

How do I determine a good path for 2D artillery projectiles?

I'm building a little "tank wars" game (like this one). I understand the math, and I am able to define a parabola from the launcher to the objective I want to reach. The parabola depends on the ...
7
votes
2answers
292 views

Adjust Aim Angle for Motion with Accelerating Bullet

So, here's my problem: I have a turret attached to a ship that moves at a variable speed through my game world, shooting at the centre of another ship travelling through the game world in a possibly ...
6
votes
1answer
289 views

How do I change the speed of an object without changing path travelled?

I have a ball which is being thrown from one side of a 2D space to the other. The formula I am using for calculating the ball's position at any one point in time is: ...
6
votes
1answer
473 views

Tracing a 2d path through multiple gravity fields

For a projectile starting at origin O, an initial velocity V, and several stationary planets P[n], how would I pre-calculate and store the path it would take without actually stepping through each ...
5
votes
2answers
769 views

How to account for acceleration when aiming projectiles?

How do I aim a constant speed projectile to hit a target if there is a constant acceleration vector acting on it? (For example, the wind and gravity from Worms.)
5
votes
3answers
841 views

Why aren't game bullets implemented as if they were real bullets?

Let's say I'm working on a 3D first-person shooter and the boss is a stickler for realism, and orders me to implement the bullets as tiny projectiles that travel, say, 1000 meters per second. What ...
5
votes
2answers
7k views

Discover x,y coordinates given set arc distance and rotation

I have a turn-based car simulation. My vehicles have a maximum speed they can travel in a round, as well as a maximum amount they can change their heading over the course of a round. Say, 20 meters ...
5
votes
3answers
3k views

In a 2D top-down game, how can I create projectiles that have a height?

A 2D game called Deer Hunter has projectiles like this: Are the projectiles 2D or 3D models? How could I implement something similar?
5
votes
2answers
1k views

Tracking Object Position - Firing on a Trajectory

How can I calculate the position of an object after "firing" it from a fixed point? I am to create a small game - most likely with canvas (pure HTML, JS based) or Adobe Flash - in which the player ...
5
votes
1answer
2k views

What units does Sprite Kit use for physics?

I'm developing a simple ball game in Sprite Kit. I need to predict the ball's trajectory, so I went back to my physics book for the equations for acceleration, time, speed and space. The problem is ...
5
votes
1answer
1k views

Realistic Trajectory of a Projectile [closed]

When simulating an airplane and a missile, to get them moving in the air we apply a force in one direction. Now an airplane has wings that keeps it afloat while a missile can have fins to stabilize it....
4
votes
3answers
6k views

How do I calculate the exit vectors of colliding projectiles?

I'm trying to create projectiles which bounce/ricochet off one another when they collide in mid-air. All projectiles are spherical and have identical size, mass, and speed. Each has two vectors: one ...
4
votes
1answer
237 views

How can I recreate the movement of arrow in air?

Given two Particles A and B which forms the arrow itself, A.P an edge of it and the opposite one B.P. Like so A.P---------B.P. const float DistArrow = 60; Where ...
4
votes
5answers
2k views

Trying to make a game with C++, using lists to store bullets and enemies, but they are not erased

I've been trying to make a pretty simple space shooter game with C++, and I have been having a lot of trouble trying to use lists to store enemies and bullets. Basically I followed the post here ...
4
votes
2answers
121 views

Scrolling background after firing projectile

I have a projectile which I fire using the mouse coords as the direction vector which I scale with a velocity vector and add a gravity vector to complete this simple simulation. I want to scroll the ...
4
votes
1answer
347 views

Finding collision point of moving projectile/bullet with a cube

I am programming a game in the spirit of Wolfenstein 3D (2D grid map, 1 cell = 1 cube) and I wanted to implement shootings. I didn't want the shootings to happen in one frame so, I wanted to see the ...
4
votes
4answers
1k views

Elastic Circle-Circle collision detection and response / Slime Volleyball physics

I am trying to recreate the Slime Volleyball game; however I am unsure how to go about implementing the physics of the ball movement. The game consists of a circular ball and semi circle players that ...
3
votes
2answers
4k views

Projectile Aim Prediction with Acceleration

I'm trying to solve the classic shoot moving object problem but with acceleration attached to that changes it from a quadratic to quartic formula but my math skills are not this good sadly as i prefer ...
3
votes
1answer
2k views

How to create a projectile motion of a cannonball in top down view?

Objective To move the bullet with projectile motion to specific destination by touch point. In the below image is an example of a bullet which has a projectile motion. On my observation, the bullet ...
3
votes
1answer
511 views

How are trajectories calculated and transmitted to other players, in multiplayer?

I play a lot of "Call of Duty", and can see tracers for gunfire, missiles, care packages falling from helicopters etc. There is a lot of activity. I am curious to know the algorithm one would use, at ...
3
votes
1answer
593 views

Maximum range of projectile fired at given force and elevation

I've gone over this again and again, and my result is obviously wrong when viewed in-action. Here's the initial formula I converted (first one): http://en.wikipedia.org/wiki/Range_of_a_projectile ...
3
votes
3answers
1k 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 ...
3
votes
3answers
862 views

Adding 'swerve' to a direction

I'm not much of a maths expert, so this is probably quite straight forward. I was playing a soccer flash game where you take free kicks. You provide Power, Swerve and Direction. I'm reading up on ...
3
votes
5answers
351 views

Forcing one projectile to follow close behind an initial projectile

I'm shooting out a projectile and I want another projectile to closely follow it. I can't simply shoot out the second projectile at a slightly lesser time because the first projectile may change ...
3
votes
1answer
209 views

What formula does this projectile velocity code derive from?

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3
votes
2answers
2k views

Find meeting point of 2 objects in 2D, knowing (constant) speed and slope

I have a gun which fires a projectile that has to hit an enemy. The problem is that the gun has to be automatic, i.e. - choose the angle in which it has to shoot, so that the projectile hits the enemy ...
3
votes
1answer
115 views

Accelerating Missile guidence

Background I'm building a simple game where two ships are launching missiles at each other in space. Stuff got complicated when the ships started moving in a frictionless environment and the missiles ...
3
votes
3answers
1k views

Rotate arrow without using Unity3d physics engine

I have this code that simulates the movement of a projectile without using the unity physics engine ...
3
votes
2answers
83 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 ...
3
votes
0answers
66 views

why collision not detection not happened in Two Sphere

I start practice 3d collision detection of sphere in OpenGl containing two sphere one sphere hit using cannon gun but collision not detect when it hit and when i debug code collision statement triger ...
2
votes
2answers
5k views

SDL Bullet Movement

I'm currently working on my first space shooter, and I'm in the process of making my ship shoot some bullets/lasers. Unfortunately, I'm having a hard time getting the bullets to fly vertically. I'm a ...
2
votes
1answer
11k views

Rotate image around a specified origin

I'm trying to rotate my Turret.png (small Gunhead with a laser in front) towards the mouses location on the screen. I tried just using my method for rotating projectiles towards the next step on their ...
2
votes
2answers
2k views

Physic of an arrow in flight

What are the formulas which represent the horizontal and vertical displacement of an arrow in flight (as well as it angle)? I would like to make sure that I take into consideration the arrow's fluid ...
2
votes
1answer
105 views

How do I create a rocket projectile that is “dropped”, then accelerates toward the enemy?

I'm making an Asteroids-like game. I've successfully implemented linear bullets. Now I want to add some rocket-styled bullets, with a certain flight path: The rockets should be "dropped" back first, ...
2
votes
2answers
2k views

Calculating initial velocities given trajectory parabola

I'm working on a volleyball game but my maths/physics knowledge isn't quite up to par. I need some help with the following problem: The player can hit the ball from anywhere on the left of the court ...
2
votes
1answer
103 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 ...