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

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80
votes
15answers
22k 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 ...
14
votes
5answers
2k 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
4answers
6k 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://...
11
votes
3answers
4k 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. float g = -9....
11
votes
2answers
576 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
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 ...
9
votes
1answer
2k 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: Vo ...
9
votes
4answers
936 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. ...
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
2answers
461 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
4answers
1k 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
2answers
10k 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 ...
7
votes
2answers
143 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
266 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: x = x0 + vx0*t y = y0 + vy0*t - 0....
6
votes
1answer
252 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
1answer
444 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
869 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
3answers
235 views

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

I have been working on this one for a few weeks, and I have yet to succeed. I have searched every resource out there, and tried them all, but still without success, so I do not believe existing links ...
4
votes
1answer
778 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 ...
4
votes
3answers
3k 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
5answers
1k 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
906 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 ...
4
votes
1answer
1k views

Realistic Trajectory of a Projectile

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....
3
votes
1answer
516 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
2answers
2k 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 ...
3
votes
3answers
394 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
342 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
178 views

What formula does this projectile velocity code derive from?

//Calculate the velocity needed to throw the object to the target at specified angle. float projectile_Velocity = target_Distance / (Mathf.Sin(2 * firingAngle * Mathf.Deg2Rad) / gravity); ...
3
votes
1answer
1k 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 ...
3
votes
1answer
61 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 ...
3
votes
1answer
105 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 ...
3
votes
3answers
142 views

Slime Volleyball Physics Implementation

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 ...
2
votes
2answers
3k 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
2answers
1k 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
370 views

How are trajectories calculated and transmitted to other players in Multi-Player?

I play alot of COD4. And can see tracers for gunfire, missles, care packages fall from helicopters etc. There is alot of activity. I am curious to know the algorithm (at a high level) that manages ...
2
votes
1answer
5k 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
1answer
68 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

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 ...
2
votes
2answers
132 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
2answers
289 views

Simulating beer pong physics in Unity

I'm trying to create a simple beer pong game in Unity. The basic idea is this - when it's your turn to shoot, you use your mouse to pick a point on the table that you want the ball to hit and bounce ...
2
votes
1answer
369 views

Calculating/Predicting a way

I'm just starting with physics, so I'm not always sure about what I'm doing. It's a 2D project but I'm using 3D physical objects like SphereCollider etc.. What I have: Objects floating in space and ...
2
votes
3answers
918 views

How can I determine trajectory from distance and time, without initial velocity?

I'm attempting to develop a Mortar that needs to lead it's shot to the target enemy. The shot will have a pre-determined constant flight time of (2.5 seconds) and it will have where the enemy should ...
2
votes
1answer
153 views

Speed needed to make a car jump from a ramp

I need to make a car jump from a ramp to another, and I need this to be done using AI so I thought it would be enough to set a fixed speed for my car when near the ramp, in order to let it jump ...
2
votes
0answers
105 views

Initial direction of intersection between two moving vehicles? [duplicate]

Possible Duplicate: Predicting enemy position in order to have an object lead its target I'm working with a bit of projectile prediction for my AI and I'm looking for some ideas, any input? ...
2
votes
2answers
303 views

What is a technique for 2D ray-box intersection that is suitable for old console hardware?

I'm working on a Sega Genesis homebrew game (it has a 7mhz 68000 CPU). I'm looking for a way to find the intersection between a particle sprite and a background tile. Particles are represented as a ...
1
vote
1answer
590 views

Calculating projectile velocity from moving object

I'm working on a top down space shooter and am having trouble with calculating/understanding the physics for projectiles launched from the space ship. The ships have a velocity vector and a turret ...
1
vote
1answer
86 views

How to make an enemy projectile head to the player's position with constant speed

How can I dynamically set the movement speed of the X and Y of the projectile so that it moves at a constant speed when the projectile heads at the player's position? I know this has something to do ...
1
vote
3answers
238 views

Solving the “bullet problem” [duplicate]

I have a 3D matrix filled with "empty space" where I put some objects (objects are represented as bunch of occupied space). The bullet is fired from coordinates (x1,y1,z1) at angles (verticalAngle,...
1
vote
2answers
562 views

Simplified trajectory equation to identify Time Taken(t) by a protectile to travel Distance(d), under gravity?

I am building a game, where I have to plot a trajectory of a ball in 3D space, launched with an inital velocity Sx, Sy, Sz. [I am using OpenGL and Android-NDK] Lets assume Sz is always 0. And Sx ...
1
vote
2answers
72 views

How to make Pong ai paddle?

I'm trying to make an ai so the paddles will move to position before the ball reaches it. I'm currently using RobotJS to move the mouse. I'm not sure how to extrapolate the position so that the mouse ...