Ninja bounce effect

[Keenic]

Hi, I'm creating a game where i have to build a tower. Whenever i drop a box all boxes sometimes bounce a little. I set the block body.bounce = 0

Here is a video http://screencast.com/t/R7hhnlbq

Is there any way to disable that feature?

[Wasyl]

I have similar problem.

Any ideas?

[WombatTurkey]

I barely notice it... but it's there. Maybe you can try setting the body's mass to a high value?

[Keenic]

There is no body mass in ninja engine.

Additionally a blocks flatten when there are stack.

[Keenic]

Any ideas how can i prevent that effects?

[drhayes]

I'm *pretty* sure what you're seeing is Ninja physics trying to separate the boxes and the platform. They overlap a little bit and then they get separated. Arcade physics has the same problems. AFAIK there's not a way to fix that besides using a different physics engine like P2.

I think you can try calling the collision handlers multiple times in an update to give things a chance to settle. Maybe try that first?

[Keenic]

I have this in update

// Blocks and platforms collision
this.game.physics.ninja.collide(this.game.blocks, this.game.platforms, this.blockCollision.bind(this));

// Blocks collision
for (let i = 0; i < this.game.blocks.children.length; i++){
    for (let j = 0; j < this.game.blocks.children.length; j++){
        if (i == j) continue;
        this.game.physics.ninja.collide(this.game.blocks.children[i], this.game.blocks.children[j], this.blockCollision.bind(this));
    }
}

Well, if its a physics bug I think its ok.

Thanks for answer.

[drhayes]

You don't need to iterate the group like that. You can just pass the group in like this:

 this.game.physics.ninja.collide(this.game.blocks, this.game.blocks, this.blockCollision, null, this);

Also, you don't want to bind your this.blockCollision method multiple times in update. Each time you do that it'll make a new function. That puts a lot of pressure on the garbage collector and will probably make your game stutter. The fifth parameter of ninja.collide is the callbackContext; in other words, it's the "this" value for your callback. This will have the same effect as calling bind but should run better.