Collisions and layers

#1 As I interpret it, layers primarily offer object depth control, it sounds like you might be using layers where you might want to use groups instead which are purely intended for object categorization purposes. Structure your layers so things on lower-numbered layers are in front of objects on higher numbered layers. If for example you want your character to walk on a path that winds through trees, some trees would need to be on a layer 'deeper' (higher number) than the trail, and some trees would have to be closer to the top (lower number).

For collision, I think objects have two choices. First, there's the standard object collision polygon, which defaults to four sides (a rectangle the size of your sprite) but you can increase the number of sides and it will form an ellipse around the sprite, again based on the sprite X/Y size. Alternatively, you can create a custom collision polygon (with setCollisionPolyCustom) that has n sides where you define the vertices for the shape. For something like a mountain, it is likely the standard collision shape won't work, and you'll need to investigate this option. I recall someone making a collision-poly generator, you may wish to search the forum for such a beast. It'll certainly make life easier.

I don't know any advantage to not enabling collision on the mountain sprite itself (with a custom collision poly as described above) and use a separate dedicated layer for collisions. I'm not sure you can even represent collidable areas without a t2dSceneObject anway, so why duplicate?

#2 Hmmm... so in this picture I have mountains, well rock walls..

so I wanted to have the player be blocked by these, but have it so I can use just the layer to add collision.. seems it would be the easiest way to do this..

hmm.. is the google search fixed yet?
:)

#3 Have a look at this thread www.garagegames.com/mg/forums/result.thread.php?qt=27393 it deals with setting up collisions on tile layers. From what I remember you can have different collission groups on a per layer basis, although the group applies to all tiles on that layer.

#4 Ok this is where I am at

// --------------------------------------------------------------------
// Setup T2D Scene.
// --------------------------------------------------------------------
function setupT2DScene()
{

 // Create fxSceneGraph2D.
	new fxSceneGraph2D(t2dSceneGraph);
	
	// Associate Scenegraph with Window.
	sceneWindow2D.setSceneGraph( t2dSceneGraph );
    //%scrollerMap = new fxTileMap2D() { scenegraph = t2dSceneGraph; };
    //%scrollerMap.loadTileMap("~/client/maps/worldMap.map");
    // Reference Layers.
	//%backgroundLayer = %scrollerMap.getTileLayer( 0 );

    //%scrollerMap.setSize( "500 500" );
	// Set Camera Position to be centered on (0,0) with
	// view width/height of (100/80).
	//sceneWindow2D.setCurrentCameraPosition( "0 0 100 75" );
    //sceneWindow2D.setCurrentCameraPosition( "0 0 100 76" );

 
    %testMap = new fxTileMap2D() {scenegraph = t2dSceneGraph;};
    %testMap.loadTileMap("~/client/maps/worldMap.map");
    //-----------------------------------
    // background
    //-----------------------------------
    %backlayer = %testMap.getTileLayer(0);
    %backlayer.setPosition("100 0");
    %backlayer.setTileSize("5 5");
    %backlayer.setCollisionActive(false, false);
    %backlayer.setCollisionPhysics(true, true);
    %backlayer.setCollisionMasks(0xffffffff, 0xffffffff);

    //-----------------------------------
    // collision
    //-----------------------------------
    %collayer = %testMap.getTileLayer(1);
    %collayer.setPosition("100 0");
    %collayer.setTileSize("5 5");
    %collayer.setCollisionActive(true, true);
    %collayer.setCollisionPhysics(true, true);
    %collayer.setCollisionMasks(0xffffffff, 0xffffffff);
    
    //-----------------------------------
    // organics
    //-----------------------------------
    %orglayer = %testMap.getTileLayer(2);
    %orglayer.setPosition("100 0");
    %orglayer.setTileSize("5 5");
    %orglayer.setCollisionActive(false, false);
    %orglayer.setCollisionPhysics(true, true);
    %orglayer.setCollisionMasks(0xffffffff, 0xffffffff);
    
    // ************************************************************************
	//
	// Add your custom code here...
	//
	// ************************************************************************

 // Player Data

datablock fxImageMapDatablock2D(playerImageMap)
{
   mode = full;
   textureName = "~/client/images/player01";
};
$player = new fxStaticSprite2D() { scenegraph = t2dSceneGraph; };

$player.setGroup( 1 );
$player.setLayer( 1 );
$player.setPosition("20 20");
$player.setSize( "3 6" );
$player.setImageMap( playerImageMap );
//attachThruster( $player, "-0.88 -0.93", 0 );
sceneWindow2D.mount($player, "0 0", 0);
$player.setCollisionActive(true, true);
$player.setCollisionPhysics(true, true);
$player.setCollisionMasks(0xffffffff, 0xffffffff);
$player.setCollisionMaterial(standardMaterial);

// Create a new action map.
new ActionMap(playerMap);
// Bind keys to actions.
playerMap.bindCmd(keyboard, "w", "playerUp();", "playerUpStop();");
playerMap.bindCmd(keyboard, "s", "playerDown();", "playerDownStop();");
playerMap.bindCmd(keyboard, "a", "playerLeft();", "playerLeftStop();");
playerMap.bindCmd(keyboard, "d", "playerRight();", "playerRightStop();");
playerMap.bindCmd(keyboard, "space", "playerFire();", "");
// Activate the action map.
playerMap.push();
}

function attachThruster(%mountObj, %mountPosition, %angle)
{
 //Create Player Thruster.
%thruster = new fxParticleEffect2D() { scenegraph = t2dSceneGraph; };
%thruster.loadEffect("~/client/effects/swordeffect.eff");
%thruster.mount( %mountObj, %mountPosition, 0, false );
%thruster.setRotation( %angle );
%thruster.playEffect();
}

the player still walks thru walls and such..
and gives this error in the console..

fxSceneObject2D::setCollisionActive - Send collision not allowed for this object! (1240).

its weird..
:)

#5 Tile layers can only receive collisions, they cannot send them. So your player can walk into a wall, but the wall cannot walk into the player (if that makes sense).

You don't seem to have an onCollision callback anywhere either, so when two objects do collide, there are no instructions available to tell the objects what to do (unless I overlooked it).

#6 Ok I got it working.. :)

Yay!...

now on to textures and the "World Map"

thanks guys.. :)

#7 Glad you got it working, good catch Philip. I read this last night and I just got a headache (lol was a long day).

Another usefull thing is the .setAtRest() command attached to fxSceneObject2D. So if you ever have problems with using the physics as collision for stoping the player (since it may send them moving slightly in different angles) you can make it call the objects.setAtRest() in the collision callback and disable the physics.