Real-Time Physics Simulation Forum

Hey guys...
Back to action...

I am studying forces because I need to create a automated flying object like a quadricopter for example.
He needs to receive an external force and react correctly to then.

So let's begin with a easy context.

With a given cube with a 1Kg of weight how can I implement a force to make him actualy fly.

Gravity must be applied like usual.

First you have to negate the forces which gravity apply, and then apply forces in whichever direction you wish.

Why did you post this in two places..?

But how do I "negate gravity" and "apply forces whichever directions I wish?

By literally modifying current object's position?
Is it the right way? I guess by doing that I might override the bullet engine positions and rotating procedure algorithm.

Is there a way to "apply the force" so, bullet can eventually move and/or rotate the object?


I posted in two place because I still dont know if the current java port contains the support to apply the forces or I will have to write my own.
I am sorry if I cause trouble.

Thank you.

Negating gravity is simply nullifying its effects, which arithmetically would be adding the opposite vector of the force of gravity applied to the object.

If you haven't taken a physics class, please do so..

Also, please start reading the usage documentation. There's seriously a function named almost verbatim to Apply Force.

For fun someone actually wrote a quadcopter running within maya
using bullet.
We used 4 maya fields parenters to where the "motors" would be
which basically apply a variable up force to the object.

If you want to make it outside of maya, you can just build a small
rig with a 4 calls to applyForceAtPoint() with an up force.