javascript - BulletPhysics (ammo.js) - How would you go about applying force to an object? - Stack Overflow

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To clarify - ammo.js is a port of Bullet Physics using mscripten

I have a character (essentially a block) that needs to be pushed with force. I have tried (I think) all of the methods for forces but I still cannot move the block.

setVelocity(1,0,0) does not even move the block - it just stops gravity from acting on it! applyImpulse([0,0,200000],[0,0,0]) does absolutely nothing.
applyForce([0,0,200000],[0,0,0]) does absolutely nothing.

To clarify - ammo.js is a port of Bullet Physics using mscripten

I have a character (essentially a block) that needs to be pushed with force. I have tried (I think) all of the methods for forces but I still cannot move the block.

setVelocity(1,0,0) does not even move the block - it just stops gravity from acting on it! applyImpulse([0,0,200000],[0,0,0]) does absolutely nothing.
applyForce([0,0,200000],[0,0,0]) does absolutely nothing.

• javascript
• bullet

Share Improve this question Follow edited Dec 19, 2014 at 2:20 Reed 15k88 gold badges7272 silver badges113113 bronze badges asked Oct 26, 2014 at 12:34 MineMan287MineMan287 5511 silver badge66 bronze badges 1

• For future reference, surround inline code with ` (the thing next to the number 1). – Reed Commented Dec 19, 2014 at 2:22

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1 Answer 1

Sorted by: Reset to default 6

Due to the fact that ammo.js is an emscripten port, you have to use its native datatypes to talk to it...

So for setting velocity you'd need to body.setLinearVelocity(new Ammo.btVector3(1,0,0));

Same goes for applyForce and applyImpulse.

In my code, I usually make a set of temporary btVector3s, and use them throughout the file, in order to reduce the overhead of allocation and garbage collection..

var tbv30 = new Ammo.btVector3();

function setBodyVelocity(body,x,y,z){
    tbv30.setValue(x,y,z);
    body.setLinearVelocity(tbv30);
}

good luck :D

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