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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1answer
305 views

Cocos2dx+Chipmunk: Fully elastic collision between moving bodies

I'm using Cocos2dx and the built in Chipmunk physics engine, and currently I've got my PhysicsBodys' materials set up with: Density=0 Restitution=1 Friction=0 in order to get fully elastic ...
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1answer
55 views

How to move a car model on a plane?

I want to create a 3 dimensional car game. But i have a problem in moving a car in other directions and accelerating. I have a car model and a road model placed appropriately. To move car forward, I ...
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1answer
99 views

What is the purpose of integration in physics engines?

All online resources seem to assume that you know what this means and/or state that this is related to object movement in some way. How does this differ than just position.x++ and position.y++ and ...
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1answer
137 views

Immovable object impact physics

I am trying to do some physics calculations from scratch, and as a result am creating a small bouncing ball example. However, I have some issues getting correct results from my impact physics when the ...
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1answer
39 views

Box2D: Making it Determinsitic?

From articles on the web, I found that floating point math generally has accuracy of at least 6 digits. With this in mind, is it possible to make Box2D which uses floats fully deterministic through ...
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1answer
219 views

Dynamic body in Box2D with fixed position

I need to fix the dynamic body position so that it would not rotate and would not move even if there are other forces, collisions and so on. Let me first explain why I need this. I have a dynamic ...
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1answer
56 views

Finding the side of a shape a ray intersects

For some simple 3D shapes (cubes, prisms) how can I determine which side a ray intersects, knowing the direction of the ray, and the normals of the shapes' sides. I thought of using plane ...
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1answer
57 views

Physics-based rotation with an array of pixels

Say I have a simple system, that has a large array of pixels with their own weight, velocity, coordinates etc. (by using classes) if each of those pixels can be connected to 4 other pixels (top, ...
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0answers
57 views

PhysicsJS object falls through the world

I have a problem while using PhysicsJS when it comes to collisions. I created a physics world, an object and applied gravity. I put the object at a certain position, it falls down because of the ...
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0answers
117 views

moving a character in sprite kit

So I've created a game in which a number of tiles are created from a txt file to create a level for the player to navigate through, but I'm having trouble moving the player. func ...
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0answers
19 views

Java JBullet models not colliding [duplicate]

Hello I wan't to do model collsion in JBullet but that don't won't to work. Models look like have some invisble holes. Here the code for creating collsion shape: int triangles_count = (int) ...
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2answers
89 views

Why does this simple if-statement that checks my main characters state never get called (Java/LibGDX)?

Been working on this for a while - basically I want my player to perform a front flip when he jumps (screen tap -> player jumps). I wrote the animation class Animator (extends Player implements ...
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1answer
177 views

Frame independent buoyancy using Substepping

I am having trouble with a frame independent buoyancy force using substepping in Unreal Engine 4. The original problem (which I am attempting to solve using substepping) is that when you apply a ...
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0answers
49 views

Stuck on a steering problem

i'm building a car game, and currently working on the steering. i would like to change the motion of Z rotation so that the car rotates around the Z axis when the wheels are turned. I can't set the ...
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2answers
145 views

Does conservation of energy exist in most physics engines?

The reason I am wondering, is because while trying to create gravity around a point in the physics game I am creating, I wondered "If I create an object in the middle of the screen, where would the ...
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1answer
83 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 ...
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0answers
13 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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2answers
214 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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0answers
74 views

Farseer: Friend/Foe Collision - cannot push foes but friends

we are using Farseer in our project and I try to find a setup to achieve the following quite complicated collision behavior: Friendly Units can push each other aside. However, the push should be a ...
2
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2answers
410 views

2D Boat controlling physics

I'm working on a top-down 2D boat game with Unity3D. I couldn't able to understand how to implement physics of rudder controlling. My physics knowledge is not enough to think how rudder dynamics work. ...
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3answers
88 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
73 views

Lots of bouncing balls sink into each other [closed]

I'm trying to model a system that simulates an arbitrary number of bouncing balls with some gravity. So far I've come up with a solution that can be seen here: ...
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2answers
231 views

Unity2D Collision Issue

I have a crate setup (in pic below) with a rigid body component, box collider and 3 circle colliders(they allow me to push the crate most of the time without getting stuck on the floor textures which ...
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1answer
146 views

2D bouncing formula doesn't work properly

am new to unity, and i am trying to create a bouncing ball, so i've did many researches about bouncing realted physics and i found a formula : Formula: -2*(V dot N)*N + V Where V is the velocity ...
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0answers
56 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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1answer
54 views

How to reposition a bouncing ball after it has passed through a surface

I have a bouncing ball which can collide with lines of a random slope. The ball passes through the lines a bit and I need to set the ball back some distance from the line. The ball (defined by ...
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1answer
227 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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3answers
98 views

Unity2D: Apply gravity to some items, when everything else is gravity-free?

Sorry for the incredibly vague title: Let's say you have an NPC, and when he dies he'll spawn items, coins for example. Instead of just pushing the coins in random directions it would look a lot ...
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1answer
405 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 ...
2
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1answer
218 views

How can I manage the deceleration of units so that they arrive on-target?

When I first started trying to set up my air units' movement in my RTS game, I thought it was going to be easy with simple Euler method linear acceleration. This was far from the case as the ship ...
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0answers
63 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 ...
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3answers
884 views

Unity rigidbody2d.velocity jumping causes weird bouncing

Im working on a game 2d game that has some platforming. I followed this video as guidance and produced the following code: public class PlayerControler : MonoBehaviour public float ...
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0answers
210 views

SpriteKit: Is applyImpulse not working correctly?

I am writing a free throwing system and because of this, I created a ball using following code. self.ball.position = CGPointMake(posX, posY) self.ball.fillColor = SKColor.blueColor() ...
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1answer
119 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 ...
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1answer
225 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 ...
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3answers
166 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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1answer
412 views

Anchoring HingeJoint2D to clicked upon spot

I'm creating a 2D game where the user can click and drag objects around. This is done by connecting a 'Hand' object to the object the user is current clicking on with a HingeJoint2D. Right now it ...
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0answers
28 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, ...
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0answers
35 views

How to tell if the ball is on the floor (in nape)?

What I wish to do in pseudo code: points = Get the set of all points (x, y) where the ball is touching other surfaces. point = Get the point out of that set with the minimal (y) value. Check if that ...
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2answers
187 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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3answers
181 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?
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4answers
1k 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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1answer
202 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
107 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 ...
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1answer
372 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 ...
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1answer
387 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.
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2answers
133 views

How can I handle position in an entity system where position can be 2D or 3D?

I'm working on a game engine to learn how it's done (so I might better take advantage of the techniques involved and other, similar engines in the future), and I've run into a problem when handling ...
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1answer
59 views

Reduce bounciness of dynamic bodies in Box2D

In my 2D platformer game my player character is modeled using a Box2D dynamic body. One thing I thought feels off though is that even though the restitution of the fixture applied is zero, the player ...
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1answer
189 views

Implementing character movement using real physics

This is the first time I'm seriously developing a game so apologies if I'm missing the obvious. In my 2D platformer I adopted Box2D since it seemed like a natural solution to model gravitational ...
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3answers
177 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, ...