P2 physics Contactmaterial not working - Please help :(

[Chewyrabbit]

Hello everyone, this is my first time posting on this forum, which means I'm pretty desperate at this point haha!

I'm trying to make a simple game where a character is sliding down a hill, this is what I got so far: http://chewyrabbit.com/game.php
I want to make the hill as slippery as ice, just like some ice parts in this game: http://test.xapient.net/phaser/ALL/ I learned a lot from this game btw. I tried to copy how the user made his ice material, but it doesn't seem to work in my game!

// Create ramp and player from tiles
sharp = this.game.physics.p2.convertCollisionObjects(map,"points");
player = this.game.add.sprite(10,10, 'player');


// Define materials
groundMaterial = this.game.physics.p2.createMaterial();
playerMaterial = this.game.physics.p2.createMaterial('player');

// Give the ramp material
for (i=0; i<sharp.length; i++){
   sharp[i].setMaterial(groundMaterial);
}
		
// define what happens when one material contacts the other
this.game.physics.p2.createContactMaterial(playerMaterial, groundMaterial, { friction: 0 , restitution: 0 });

What am I doing wrong? Please help me  

[Chewyrabbit]

So because it took the mods a 100 years to approve my question, I found out something by myself:

update: function() {
		
		//  Reset the players velocity THIS PART
        //  player.body.velocity.x = 0;


		if (cursors.left.isDown)
		{
		//  Move to the left
		player.body.moveLeft(150);

		player.animations.play('left');
		}
		else if (cursors.right.isDown)
		{
		//  Move to the right
		player.body.moveRight(150);

		player.animations.play('right');
		}
		else
		{
		//  Stand still
		player.animations.stop();

		player.frame = 4;
		}

		// Jump!
		if (cursors.up.isDown && this.game.time.now > jumpTimer && checkIfCanJump(this.game))
		{
		    player.body.moveUp(800);
		    jumpTimer = this.game.time.now + 750;
		}

	},

In the function where the player's movement is controlled, the player's default velocity is set to 0. When I delete that part, the player slides pretty smoothly down the hill. 

But! I still can't seem to apply material to the player, no matter what I try. The material just seems to be ignored. I get no errors though.

So how can I succesfully apply material / contactmaterial to the player?