Collisions with tiles on a Layer

#1 This is a snippet of code from one of my earlier tests with tiles:

// wall layer - determins which tiles are walkable 
  %w_layer = %this.levelMap.getTileLayer($Game::map::WALL_MAP_LAYER);
  %w_layer.setLayer( $Game::rendering::WALL_LAYER );
  %w_layer.setGroup( $Game::collision::WALL_GROUP );
  %w_layer.setCollisionMaterial( immovableMaterial );
  %w_layer.setCollisionActive( false, true );  
  %w_layer.setCollisionCallback( true );  
  %w_layer.setCollisionMasks( BIT( $Game::collision::PLAYER_GROUP ) | BIT( $Game::collision::ENEMY_GROUP ),
                                            BIT( $Game::rendering::PLAYER_LAYER ) | BIT( $Game::collision::ENEMY_LAYER ));
  %w_layer.setCollisionPhysics(false, false); // we're using our own model

From what I can tell, you just get the tile layer then set the collision masks/callbacks as you would any other object.

#2 I've tried to do that in my little test game and it doesn't seem to work. It seems like the only wayI can can get any collision is by making my one tile-layer a static sprite. Any ideas?

Here is a snippet:

%groundLayer = %desertMap.getTileLayer(2);
	%groundLayer.setImageMap(grImageMap);
	%groundLayer.setPosition("0 0");		
	%groundLayer.setTileSize("100 75");
	%groundLayer.setSize("100 75");
	%groundLayer.setLayer(1);
	%groundLayer.setGroup(1);
	%groundLayer.setCollisionActive(false,true);
	%groundLayer.setCollisionPolyCustom(4, "-1.000000 0.800000 1.000000 0.800000 1.000000 1.000000 -1.000000 1.000000");
	%groundLayer.setCollisionScale("1 1");
	%groundLayer.setCollisionPhysics(false,true);
	%groundLayer.setCollisionMaterial(immovableMaterial);
	%groundLayer.setCollisionMasks(BIT(1),BIT(1));
	%groundLayer.setDebugOn(BIT(5));
	%groundLayer.setImmovable();

Thanks!
-Chad

#3 What have you got in your onCollision callback? If you haven't got a callback telling your game what to do when your player hits something, then nothing will happen.

Try something like this:

function fxSceneObject2D::onCollision( %srcObj, %dstObj, %srcRef, %dstRef, %time, %normal, %contactCount, %contacts )
{
	// player hits something
	if (%srcObj = $player)
	{
		$player.setAtRest();
	}
}

I suspect it will also be easier for you to set collision poly in the tile editor itself so they are part of the map rather then spend a significant amount of game time checking your tile layer and creating the polys on the fly.

The TileEditor.pdf file that comes with T2D explains this, although I must admit I haven't used it yet.

#4 Philip,

Oh hey that worked. I had an onCollision callback but I didn't have the same number of parameters... crazy. I plan to have the collision poly definitions in the tile editor but for the sake of experimenting I am doing it on the fly. Thanks!!

-Chad

#5 Excellent, glad it worked :)

#6 Hrm... you know I might have spoken too soon. I had a typo so T2D reverted to the last working .dso rather then using my changes. What a bummer. I still seem to be unable to get collisions with tile layers.