Objects can't collide or overlap if they are on different layers?

[SuperDisk]

I've got a HUD element that is on layer 2. I want to see if the player (on layer 1) is underneath it so it will turn transparent.

If the player is overlapping the HUD element, then turn it transparent, if not, turn it opaque... This works fine and dandy if they're all on layer 1. However, the HUD is on layer 2, and so it doesn't register as a collision or an overlap..

Is this a bug or some sort of annoying feature? How do I work around this?

Thanks.

[Skyhunter]

Collisions and overlaps only works if the objects are on the same layer.

You can place an additionall object always at the player position on layer 2 to work around it, or code if player > y hud etc...

[nivram]

This is not a bug. Have an invisible active, the same size as the hud, on the same layer as the player and have it follow the frame as the hud. Have that register as a collision or an overlap.

Marv

[SuperDisk]

I ended up doing a similar method to Nivram. I had an invisible active player on Layer 2 that did collisions and stuff, but this is quite an unfun feature.

Layers are so great, why do they have to have this..

[King_Cool]

SOLUTION A
3 Events:

The graphical screen will only update once all Events have been checked, so it does not matter what you do ( in this case change Layer of the HudElement ) as long as you undo it before the Event Editor finished reading its last Event
Example:

Say you have a Dog in your empty ( blank white ) Frame.

+ Allways
-> Create House at x,x

+ Allways
-> Create Sun at x,x

+ Allways
-> Create Moon at x,x

+ Allways
-> Destroy House
-> Destroy Sun
-> Destroy Moon

If you run the Application, all you will ever see is a Dog against the white blank Frame, because you both create and destroy the other Objects before the graphical screen updates.

+ Allways
-> HudElement move to Layer P ( same Layer as Player )
-> HudElement change effect to Opaque

+ If HudElement is overlapping Player
-> HudElement change effect to Semi-Transparent

+ Allways
-> HudElement move to Layer H ( moves it back to the Hud Layer )

...
SOLUTION B
2 Events:

Im assuming your HudElement resides at a fixed positioned in the Window ( which HudElements usually do ).
In that case you allways know where the HudElement is located relative to the Window, so all you realy need to do is compair the Players position to check if hes located in the HudElement Area ( eliminating the need for an Overlap check ).

+ Allways
-> HudElement change effect to Opaque
( this Event can be made more efficient, but ill keep it simple for simplicitys sake )

+ Player X position >= Xcoordinate1 ( left edge of HudElement area )
+ Player X position <= Xcoordinate2 ( right edge of HudElement area )
+ Player Y position >= Ycoordinate1 ( top edge of HudElement area )
+ Player Y position <= Ycoordinate2 ( bottom edge of HudElement area )
-> HudElement change effect to Semi-Transparent

[King_Cool]

There should be a simple option within each object's properties to change which layer(s) it interacts with. Perhaps this could be included in MMF3?

Collision Mask controll would be nice yes.