Relating to the motion of objects through space and time. Including concepts such as acceleration (thrust and gravity), mass, collision response, friction and more.

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19 views

Relative movement in Box2D (keep object from falling off planet)

I'm creating a game with planets orbiting around a sun, like this: The brown square is the earth, rotating around its center and around the sun. The yellow square is the sun, which doesn't move. Now ...
1
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1answer
440 views

Spritekit - gradually apply force vector in different direction (space ship turning)

I have a space ship that I'm applying a force vector to using a joystick for control. I would like this to smoothly fly around when I'm switching directions.. Exactly like minisquadron if you've ...
1
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1answer
215 views

Bullet 3D Physics Objects Not Rotating?

So I've got Bullet 3D controlling the motion of objects rendered with DirectX. In the clipping below I've got 2 identical rectangles & 5 balls. The lowest rectangle has a mass of 0 and doesn't ...
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0answers
12 views

How to experiment for the value of gravity in Libgdx? [duplicate]

I am following a guide on how to play a flappy bird clone in the LibGdx framework. -http://www.kilobolt.com/day-5-the-flight-of-the-dead---adding-the-bird.html I am currently on the part where the ...
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3answers
42 views

[Unity]Avoid boucing when ground move down

I have a sphere & a quad, when the quad move down, the sphere fall after and bounce back continuously. I dont want to change my project setting like bounciness, gravity,mass and I need the sphere ...
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1answer
45 views

How do I derive an appropriate acceleration value for my game?

I am creating a Flappy Bird clone from this tutorial. I have a question about acceleration in libgdx. The author assigned the bird a constant acceleration vector in the constructor of the bird ...
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3answers
121 views

Sound Synthesis from object collision in Virtual Reality Environment

I have a project whose subject is "Sound Synthesis from object collision in Virtual Reality Environment" First of all, I have to define some objects with certain attributes (like shape, mass, ...
3
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1answer
224 views

Jelly ground collision

For fun I am trying to replicate the mechanics from The Floor is Jelly. So far I have successfully created "jelly islands/blocks" which are represented by an array of points and then drawn by using ...
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2answers
652 views

Calculating torque required to turn an object to a target rotation, depending on timestep

The function below works fine, when the timesteps of the physicsengine are short enough for the function to update often. It determinates when the ship(the object) needs to start decelerating to reach ...
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4answers
7k views

Is there a 2d physics engine that can model fluids and gases? [closed]

At this point the platform and programming language don't matter I would just like to know if something out there exists for this. Any help is appreciated.
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0answers
25 views

Is there a successor to Farseer for C# 2D physics? [closed]

I'm currently relying on Farseer Physics 3.3.1 and was recently considering to upgrade to 3.5, but it appears that the project has been abandoned by its author - which makes me a little insecure on ...
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1answer
25 views

Using box2d with starling

In my game I have a Main class in which i am initializing starling framework by passing Game class like below myStraling = new Starling(Game , stage); In the game class I have Instances of Welcome ...
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1answer
74 views

LibGDX Bounding Rectangles

I'm creating some rectangles surrounding my sprites for my player and bullet class to detect collisions with the overlaps method in Intersector class of LibGDX. I have a question: When I instantiate ...
63
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5answers
27k views

Good 2D Platformer Physics [closed]

I have a basic character controller set up for a 2D platformer with Box2D, and I'm starting to tweak it to try to make it feel good. Physics engines have a lot of knobs to tweak, and it's not clear to ...
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0answers
36 views

How to get rid of “ghost mode”?

I've got few Spatials (mostly boxes) in my space. Player is able to move main Spatial using mouse or keybord. But now every Spatial can go through another. Like in a ghost mode. How can I get rid of ...
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4answers
1k views

How do I implement deceleration?

I say "deceleration" because I'm not using acceleration at the moment; what I mean is moving the velocity back towards zero, eventually stopping. I'm new to vectors and not so great with physics and ...
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1answer
69 views

2D bouncing ball simulation - angular velocity

How does angular velocity of a ball affects it's speed after a bounce? I'm trying to simulate 2D bouncing ball physics. I've found a nice solution how to calculate ball's velocity after a bounce: ...
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1answer
37 views

Custom arcade physics rate (e.g. bullet time)?

Is there a way to modify the rate that physics is applied, either globally or on a per-sprite basis in Phaser? That is, how can I slow down or speed up the rate at which sprites move around, or fall ...
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2answers
5k views

Why would Rigidbody.AddForce not resulting in movement of my objects?

I'm trying to get my card objects to spread out randomly but nothing happens. I know the method is called cause I get the prints in the console for each card. But they don't move. No errors reported. ...
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1answer
57 views

Moving CCNode with constant speed in cocos2d

I want to move the object (CCNODE) with constant speed in any direction , what i have did till now is applied a force to object at start to get it moving and set elasticity as 1 and friction as 0 to ...
5
votes
1answer
141 views

Programming Dynamic 3D Water/Waves?

I'm a little bit stuck on how I might go about programming dynamic, interesting water in a game. To qualify that a little bit, I'm interested in creating water with broad, rolling waves that affect ...
0
votes
2answers
301 views

3D collision physics. Response when hitting wall, floor or roof

I am having problem with the most basic physic response when the player collide with static wall, floor or roof. I have a simple 3D maze, true means solid while false means air: bool ...
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3answers
2k views

Collider2D and Rigidbody2D, how do they work?

I have been learning JavaScript and Unity for a week now. I learned how to make Cube as a Ground and another Cube as a player and I used this code to make the Player Cube move forward and backward and ...
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0answers
42 views

Calculate hit-normal from collision

I am trying to implement a swept test collision between an AABB and a Line Segment and I found this implementation working great ... Except that it doesn't cover how to calculate the hitNormal and ...
0
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1answer
191 views

Grid collision - finding the location of an entity in each box

I am trying to implement grid-based collision in a 2d game with moving circles. The canvas is 400x400 pixels. Below you can see the code for my Grid class. What I want it to do is check inside which ...
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4answers
306 views

What is the easiest way to make an object follow the edge of a sprite?

I have a rounded rectangle sprite and another sprite that's just a circle. I want the center of the circle to follow the edge of the rounded rectangle. Is there any easy way to accomplish this task? ...
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2answers
579 views

Unity Physics Material - Character Slides Too Much

I am currently working on a 2D platformer in Unity. I am using a prefab from the AssetStore for my character (The last paragraph contains a link to the prefab). The character has a circle collider for ...
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3answers
125 views

Formula for Planetary Alignment

I am attempting to create a game where there is a universe of two 16-bit addresses ranging from -32768, -32768 to 32767,32767, or in hexadecimal, each value can run from $8000 to $FFFF then 0 to ...
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3answers
80 views

How to make an object oscillate left and right?

I can't seem to make an object move left and right, back and forth, on room start whilst on solid ground. Codes I used: Step Event: if image_index is greater than 5, then physics_apply_force ...
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0answers
26 views

Moving from point A to B optimalisation [duplicate]

Here's my abstract class for movement: vector2d normalize(vector2d v) { auto a = sqrt(dotProduct(v, v)); vector2d r; r.x = v.x/a; r.y = v.y/a; return r; } ...
15
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7answers
19k views

In Pong, how do you calculate the ball's direction when it bounces off the paddle?

I'm trying to wrap my head around this very Hello World-y problem in game development. I've created a TicTacToe game in XNA so I guess the next step would be a Breakout clone. Keep in mind that I ...
4
votes
1answer
1k views

How do I make a collision between AABBs slide?

I have a room with objects inside. Each object has it's own AABB. I know how to check for collisions between the objects with an AABB-AABB intersection. How do I calculate an appropriate collision ...
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1answer
37 views

Launch Velocity for Simple 3D Projectile [duplicate]

This is a pretty easy question, but I can't quite figure out the answer. I have: The initial position of a projectile. The gravity vector. The (stationary) target I want to hit. A maximum launch ...
5
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1answer
186 views

How can I implement large moving “colossus” characters that also act as environmental objects?

I'm curious how enormous characters that act both as entities and environments are implemented. I'm thinking of characters like in Shadow of the Colossus which move, but which the player can also ...
0
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0answers
18 views

Impulse resolution with varying time delta

I thought I'd try building a basic 2D physics engine, and I'm currently writing the impulse resolution part of it (yeah, not very far into this). Using quick internet tutorials like this as a guide, ...
1
vote
1answer
33 views

Altering Animation Playback Given Terrain Information

Say my character has a jog animation. Assuming Y is vertical, his feet leave the ground at Y=0 and hit the ground again at Y=0. This works fine in a world like that of Minecraft, where every surface ...
8
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5answers
4k views

How do I detect the direction of 2D rectangular object collisions?

After this question, I need some more help. How can I find out which side of a rectangle a collision came from and react accordingly? The blue arrows are the paths that some circular objects ...
3
votes
3answers
1k views

Unity 4 - Some Rigidbodies Won't Fall Asleep

I'm having this problem in the free edition of Unity 4.1 where rigidbodies aren't falling asleep (and yes, I've tried playing with the sleepVelocity and sleepAngularVelocity values!). I've read the ...
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3answers
302 views

How do you properly implement level boundaries in a physics room?

I have an issue with creating a proper boundary in GameMaker Studio when using a physics enabled room. My room has a gravity of 0, as it is in Space. My player object has the default values, but a ...
12
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4answers
398 views

How could I constrain player movement to the surface of a 3D object using Unity?

I'm trying to create an effect similar to that of Mario Galaxy or Geometry Wars 3 where as the player walks around the "planet" gravity seems to adjust and they don't fall off the edge of the object ...
2
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0answers
207 views

How do I compute the angle between a pixel on an irregular curve and a circle colliding with it?

I'm building a custom physics engine to accompany a level-editor. This image shows how the level-editor outputs levels: Now, some explanation is in order. The curve is defined by the red points. ...
2
votes
1answer
321 views

How do I make my camera follow a Box2D object?

I'm implementing a camera in my game. It worked for regular objects, but I began using Box2D and obviously things changed a bit. I have a Body object that I want to draw at the center of the screen. ...
0
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2answers
89 views

Trajectory of a spinning ball

How do I would precalculate trajectory of a kicked ball, when it's spinning? I'm applying spinning using simplified Magnus effect every frame like this and it works: acceleration += swerve × ...
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vote
1answer
76 views

How can I have a Mecanim animation with displacement and physics?

I have 3D wolf models from my animator with displacement (i.e the wolf transforms with animation, not in-place). I have added rigid bodies to the models. I am facing following issues while executing ...
11
votes
4answers
820 views

Animated examples of different interpolations formulas: any link? [closed]

I remember having spotted a link to a huge page with different equations to non linear interpolation curves, for example if you want to stop a car smoothly, etc. Those can sometime be useful to ...
8
votes
3answers
155 views

Physics simulation methods for large delta times?

What physics simulation methods are most suitable for really big delta time (hours to weeks)? In addition, would I face any problems combining different methods for big and small delta times?
1
vote
1answer
59 views

Simplified aerodynamics for 2d (top-down) airplane

I am writing a top-down 2d game, in which the player can control an airplane via the WASD keys. The W key should move the plane upwards (north), the A key to the west, and so on. Now I need a ...
0
votes
1answer
104 views

Creating a Player object in a physics engine [duplicate]

I have a working physics environment using Farseer - but how do I create a player object that can walk around? My current attempt involves applying forces to a rectangular body whenever keys are ...
0
votes
1answer
114 views

Jump Issue(Unity3D)

This is my first character control script. Where a cube is my player and the objective the i want to achieve with my script are 1.the cube moves in horizontal axis till the button is pressed once ...
3
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1answer
280 views

Change unity physics engine speed

Is there a simple way to change the speed* of unity's physics engine like in the game SuperHot? Any script language is ok but javascript is preferred. *I am not sure if speed is the correct term.