# Tagged Questions

Rigid body dynamics is the simulation of physical objects which are "solid" and cannot deform or change shape during simulation.

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### Physics: calculating angular acceleration in world vs local space

I have a pretty simple rigid body simulation written in Python. In my code I calculate the angular acceleration using formula: angAcc = torque * inertiaTensor^-1 (note row-major matrix order) Now, ...
42 views

### Handling movement on sloped surfaces - clamping character to sloped surface

I've noticed that a lot of people seem to have this issue but I've yet to find an actual working solution - when a rigidbody-based character controller (I'm not using Unity's character controller) ...
28 views

### Changing speed of an object

Is there a way of changing speed of an object at certain time? I want to change my speed to my initial speed after colliding with any object. I have already added bounce Physics to my colliding ...
220 views

### Increasing friction or Adding force relative to transform position in Unity 2D?

Back again with a quick question! I have a few basic platforming mechanics going on in this scene. I have a prefab platform with an animation that loops back and forth between two different x ...
95 views

### Understanding HingeConstraint in jBullet

I'm using the java port of BulletPhysics engine jBullet. I'd like to make a joints between 2 triangles so that one edge of the first and one edge of the seconds act like a hinge. But I don't ...
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### Bullet Physic: Stack transformations on body after adding

How can I stack multiple transformations on a body? I mean... Rotate, translate and then rotate again? If I understood, a transformation on a rigid body can be made like this: btTransform ...
32 views

### In Unity3D (and PhysX), how do I calculate the products of inertia?

Since unity3d uses physx underneath the surface, obviously they share the same features. One of the features is the moment of inertia tensor - Unity3D one, PhysX one. Though, they use the diagonal ...
610 views

### Why does my RigidBody collision fail depending on which entity is moving?

I am working on a UDK project and have a collision problem. I have a Crate which is a kActor with RigidBody physics and my player who is a Pawn. When my player moves and collides with the crate, the ...
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### How would joints work in an impulse-based physics engine?

I want to learn about physics engines, especially impulse-based ones. So I've followed along this tutorial to create some simple rigid-body physics: http://gamedevelopment.tutsplus.com/tutorials/how-...
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### Should I compute impact damage with energy or momentum?

My game uses physics (Box2D in particular). Just about every object in the game can be destroyed, and the primary method of combat is by slamming objects into one another at high speed. It makes ...
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### Rigging Skinning of human skeleton skin mesh scanned by MRI

I have successfully developed a system in Qt/C++ for human musculoskeletal mocap simulations. I can run asf, amc, bvh motion capture files and can visualize the joint transformations. I even simulated ...
108 views

### unity4.3 rigidbody2d unexpected force behaviour

So guys ive edited the question and here is what my problem is i have a player which has a rigidbody2d attached to it.my player is able to doublejump in the air nicely and stick to walls when ...
206 views

### Swiping with rigidbody

My character moves continuously forward with rigidbody.velocity = v3Force * strength; My Swipe script is based on a youtube tutorial from https://www.youtube.com/watch?v=9ZIHx09GevI I just changed ...
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### Rigidbody2d and square steps

Well, I am developing small game based on Rigidbody2D character. He should go horizontally, jump and automatically climb on rectangular stairs when walking on them. I know slopes is a possible ...
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### Question about designing and controlling a forklift's forks

I am building a forklift for a game that I am working and I am trying to come up with a valid way of designing it. So far I haven't really liked the way it behaves in game The forklift has three parts ...
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### unity Rigidbody jump

I absolutely don't know what is the problem with this code and I have tried everything without any success. I need help. void FixedUpdate() { if (Physics.Raycast(transform.localPosition+new Vector3(...