[P2, move] Differences between versions

[olorin]

Hi,

 

I develop a game which uses P2 and collisions. But in the latest versions, the behavior of move, speed and collision are very different.

 

My reference example is “World move” between Phaser 2.0.6 and the lastest version.

http://examples.phaser.io/_site/view_full.html?d=p2%20physics&f=world+move.js&t=world%20move

 

I think the move behavior is more realistic in Phaser 2.0.6. So, how to keep these behaviors with the last version?

I have made live examples with jsbin, to see the differences :

 

Test 1: moveforward 3000 + angle 90

The ball bounces many times, and the speed gradually slows

Phaser 2.0.6: http://jsbin.com/moxijibebuta/1/edit?html,js,output

 

The ball bounces one time and nothing…

Phaser 2.1.2:  http://jsbin.com/kipayexoqadu/8/edit?html,js,output

 

Test 2: moveforward 1000 + angle 60

The ball bounce many times, and the direction is fine for each bounce.

Phaser 2.0.6: http://jsbin.com/wiloyizanucu/1/edit?html,js,output

 

Indescribable…

Phaser 2.1.2: http://jsbin.com/rejidageguhu/1/edit?html,js,output

 

What do you think about that? Can we have the movement from 2.0.6 with the latest version?

[george]

Hi, this occurs first in Phaser 2.1.0, which introduced P2 0.6.0. But I can't see anything that would cause this.

It looks like something changed the restitution (bounce factor) handling. You can get the old behaviour by setting the restitution to a value higher than 0 in the default material:

 

//to this once in your code. Be careful! This will change the restitution for all bodies without their own material. this.physics.p2.world.defaultContactMaterial.restitution = 0.5

See: http://jsbin.com/rejidageguhu/3/edit (2.1.2 and bounce)

 

If you want to change the restitution you could create your own contact material instead. Have a look at the phaser example

http://examples.phaser.io/_site/view_full.html?d=p2%20physics&f=contact+material.js&t=contact%20material

 

Regards George

[olorin]

Thank you very much George.

 

I have tested to use contact material, and only "restitution" property seems to change the move. Change other properties do nothing.

 

I hope that the old behavior will come back with the future releases…