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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25 views

Smooth digging physics with Phaser

I'm trying to make a Dig Dug style game where you will be digging into a material. This is going to be a HTML5 game and I have decided to use the Phaser framework. One way to do the digging mechanic ...
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2answers
39 views

How to move an object uniformly from one point to another at a fixed angle? [duplicate]

In my 2d java game, I need to move Point objects (as projectiles) from Enemy object to Player object in a straight line. I did some research and found out that I can use atan2(x, y) method of Math ...
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1answer
43 views

Ground in AndEngine

I'm quite a newbie to AnEngine and I have a problem. I have been searching a lot, but I couldn't find answer. I'm trying to make my first game, but I have no idea how to make ground. I'd like to make ...
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0answers
38 views

Implementing a group formation behavior

I am trying to implement a group formation behavior where all the units in my group follow a leader and maintain their position throughout. So far I am able to move them, rotate and follow the leader. ...
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0answers
17 views

calculating avoidance forces for similar objects unity [duplicate]

I am trying to work on collision avoidance for my troops. Currently all my troops have their target object as the leader who is wandering in physical space. The troops just follow the leader but they ...
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1answer
49 views

Wandering motion in Unity

I am trying to come up with a smooth wandering motion for my game-object using Unity. What I currently doing is rotate the object by some random angle calculated every 1.5 second delay. But I am ...
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1answer
77 views

Moving object towards a target Unity

I am trying to implement a script where basically my players would reach the target destination. Below is my script private void MoveTowardsGoal(){ if (Vector3.Distance ...
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1answer
116 views

How can I simulate a magnet that attracts a ball in a 2D enviroment?

I am making a top-down game where you have to move a ball from point A to point B. You are attracting the ball using magnets that are standing still. The ball needs to get pulled by multiple magnets. ...
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1answer
33 views

Calculate an approximate distance between two rigid bodies or OOB

Is there any easy way to get an approximate distance between two OOB? I searched around and people talk about GJK algorithm, however I don't see it returning the distance between two convex objects ...
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0answers
50 views

How to apply physics when you have sub frame state changes?

I'm currently calculating my physics every 1/100th of a second and using a state machine to manage the current state of the player. In my main loop I'm checking user input and transitioning the state ...
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1answer
75 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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0answers
45 views

Implementing a motorized hinge joint

I have a 2d physics engine, with three boxes: "body", "left wing" and "right wing". The wing boxes are connected to the body using a hinge joint. The physics world has no gravity. I'm attempting to ...
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33 views

Drawing a object with Box2D and HTML5 canvas on current mouse position

I'm attempting to create a air hockey type game with HTML5 canvas and JavaScript, using Box2dWeb for the physics calculation. I need a way to draw the puck at the current mouse x and y position every ...
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2answers
65 views

Unity, Unrealistic Sphere On Inclined Plane

So I am trying to model a ball rolling down an inclined surface in Unity based on what I am observing in real life but it is still quite off. In Unity it takes the ball about 3 seconds to travel ...
2
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1answer
66 views

AABB implementation

I have seen in some texts and tutorials on the web where an AABB is implemented as a position vector and then half-width and half-height vectors. What is the advantage in using the half-width and ...
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1answer
298 views

Simple collision detection in Unity 2D

I realise other posts exist with this topic yet none have gone into enough detail for me. I am attempting to create a 2D game in Unity using C# as my scripting language. Basically I have two objects, ...
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1answer
83 views

Calculate velocity of a bullet ricocheting on a circle

I made a picture to demostrate what I need,basecaly I have a bullet with velocity and I want it to bounce with the correct angle after it hits a circle Solved(look the accepted answer for explain): ...
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2answers
120 views

Unity - Mecanim & Rigidbody on Third Person Controller - Gravity bug?

I'm working on a third person controller which uses physX to interact with the other objects (using the Rigidbody component) and Mecanim to animate the character. All the animations used are baked to ...
5
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1answer
210 views

How can glass breaking effect from Smash Hit be achieved? [duplicate]

I saw Smash Hit the other day and was amazed by the physics of the game, specially the shattered glass effect: I've read other posts about this subject but I still feel that they don't share enough ...
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1answer
83 views

Is Physics a prerequisite to learn Unity3D

I have got a basic knowledge about the Unity 3D platform but I coding in Unity has not been that easy for me. For the simple reason I can see is, I cannot understand which function to use for what ...
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1answer
108 views

Consistent Space Gravity Simulation

I have done some reading into this subject but haven't been able to come to a conclusion that I'm really satisfied with so far, so here is the situation. I have a game set in space, its top down and ...
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1answer
69 views

Bullet - objects falling through

I have problem with bullet collisions. You can see problem on this video (around 0:18): http://goo.gl/DiVP8l Objects are "embeded" inside vertical bars - that is not correct - they should be ...
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2answers
120 views

What torque should I apply in Bullet to maintain a vertical orientation?

I have a RigidBody in Bullet. Each frame, I want to apply torque to correct its orientation toward an upright position (i.e. near-zero pitch and roll). I know its angular velocity and orientation. ...
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1answer
87 views

Irregular oval collision detection

I am using a physics library based on the Bullet physics engine. How do I create an egg shaped object or a cylinder where the width differs from the depth (i.e. with an oval shape)? I'm not looking ...
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1answer
108 views

SpriteKit - How to jump to specific position?

I'm would like to achieve something like Object A will jump to position A in parabolic way. For example: I am able to make the object jump but i do not know how to calculate to make the object jump ...
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1answer
80 views

What is the appropriate way to implement wobble/balance mechanics in Unity 3D?

We are trying to implement a minigame where the player character sits on a bouncing ball, and needs to a) hit forward to move forward and b) hit left/right to adjust against the the ball's natural ...
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1answer
118 views

How to run physics simulation in the background for possible future outcomes?

I'm designing a physics-heavy game in 3d. The core mechanic of this game is that the user gets to choose his actions based on probable future outcomes. For example - the player has a choice whether ...
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1answer
41 views

AddRelativeForce not working correctly

I am stuck on the code for couple of days but couldn't figure it out. Therefore I turned out to look the answer here but couldn't find any that match the requirement Hope some One might help here is ...
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1answer
60 views

How can I implement a more realistic momentum system in Unity 4.5?

I'm just starting out with Unity and am making a simple environment where there is a sphere and a ramp. When the sphere approaches the ramp everything is fine. As soon as the sphere hits the ramp is ...
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1answer
134 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 ...
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2answers
107 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 ...
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3answers
63 views

Character animation in physics-simulated environment

What are the standard solutions for animating characters in physics-simulated environments? Let me explain what I mean - in most games characters are pretty much excluded from physics simulation - ...
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2answers
63 views

Character bounces/stutters down hills

I'm using Unity3D (not 4) and I'm experiencing a bit of a problem with character movement. I'm using a cylinder as a First Person player with a child Main Camera. In this cylinder is the stock ...
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1answer
28 views

Moving multiple hingejoints based on joystick input

I'm controlling a 2D side-viewed (facing right) stickman with a joystick. The movements are fairly intuitive: Joystick down -> Stickman crouches down Joystick up -> Stickman stretches out ...
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1answer
93 views

Best practice for organizing the physics of objects?

Apologies because this is a long post and I am inexperienced. I would really appreciate the input from some experienced developers. These are my two goals for this project: To learn the best ...
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3answers
216 views

How do I resolve a sphere-triangle collision in a given direction?

I am trying my hand at game physics. I understand that the basic way to pull back a sphere when it collided is to negate the penetration distance: // If collided... // `distance`: distance form ...
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0answers
28 views

PhysX - Revolute joint around unit vector

I'm using a right-handed coordinate system with (0,0,-1) = forward, (1,0,0) = right and (0,1,0) = up. PhysX version is 3.3.0. I have a unit vector which represents the axis around which my actor is ...
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2answers
124 views

Why are my Box2D wheels slipping on ground?

I have a car, set up in Box2D as a rectangle connected with two wheels using WheelJoints: The wheels are defined as follows: FixtureDef wheelFixtureDef = new FixtureDef(); ...
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0answers
30 views

CCTextField won't appear

I can't seem to add a CCTextField in my physics node, I tried all different methods, but it's still not happening. Here's my code: CCTextField *tf = [[CCTextField alloc] init]; tf.contentSize = ...
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2answers
158 views

How to add a constant horizontal force just like gravity?

I want to add a constant horizontal force, just like gravity to a projectile or a sphere moving in 3d space, which will make the projectile or ball or sphere or whatever be influenced by this force so ...
3
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1answer
116 views

Unity's default integration method

Which method(s) does Unity provide for physical integration? RK4? Verlet? Euler?
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3answers
165 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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0answers
49 views

Box2D collision damage calculation from postSolve or not?

I'm using postSolve to get impulse then calculate damage base on that impulse. But there's some issue: Stability The damage isn't stable. When the same ball is hitting with same speed, the damage ...
6
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1answer
130 views

How can I predict player-to-projectile collisions in Box2D?

I'm making a real time shooting game with Box2D as the physics engine. The gameplay is mostly about trajectory, like Angry Birds. I want to make a slow motion effect and move camera to the player when ...
5
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1answer
141 views

Self colliding cloth physics

I've previously simulated cloth using Verlet integration but couldn't successfully get the cloth to collide with itself in an efficient way. The reason being is because I used a brute force algorithm ...
2
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1answer
68 views

Is there a way to view all colliders in a unity project at runtime (after the game have been deployed)?

I'm have created a small Unity project but physics has weird behavior (bug). Unfortunately it only happens on some specific hardware (after build), not on development machine. I don't know what is ...
0
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1answer
120 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 ...
2
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2answers
52 views

How can I add an impulse to specific rigid bodies at rest?

Scenario Rocks falling down a rocky slope, with a flat surface at the bottom. When they land on the surface, the rocks move slightly before coming to a rest. GLESDebugDraw shows the bright orange ...
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1answer
43 views

How to resolve OBB collision penetration?

I would think this is a common issue, but I couldn't find an answer that helped me. Help would be appreciated. In my game I have rectangular objects. They have rotating bounding box, aka not AABB but ...
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1answer
48 views

How can I avoid type checking in the physics side of collision handling?

I have a class responsible for handling the physics side of collisions. When the collision detector spots a collision, it notifies both entities in the collision to take care of gameplay. It also ...