Pasted backdrop not getting deleted?

[King_Cool]

Hi
Im having a problem.

I have 1 Active Object.
I have 3 Events:

#1 Past Active as backdrop ( obstacle, Layer1 )
#2 Remove all Pasted Objects ( Layer1 )
#3 Check for Overlap between Active and Background Obstacle

^ Logcially no Overlap should be detected, but the Overlap is detected. It seems the pasted Obstacle backdrop is never deleted, but im not sure whats really going on.

Does anyone know why its actng this way?
What am i doing wrong?
Is there a workaround?

[chrilley]

Looks like a bug to me. It seems like the visual sprite is removed but the collision mask is still there(add a movement to your active and you can run back and forth over the now invisible backdrop!).

It seems to have something to do with what kind of Conditions you check before you remove the backdrop. I moved the Delete All Backdrops action from Start of Frame down to the event where you check for Overlaps and now it only counts to 1(both sprite and mask is removed upon collision).

I also tried using Always/Run this once conditions as alternatives to this but it had same effect as the Start of Frame condition. Different results from different conditions... Ultimately I couldn't get the counter to be 0.

[casleziro]

It seems that the backdrops can't be deleted from layers on the first few frames. Try changing your Start of Frame condition to a "Timer is greater than 00"-02" or a "Upon pressing a key" and it will work. Oddly, the "Timer is greater than 00"-02" only works for me every other time I run the application.

Definitely seems to be something going on. I'd report this to the bugbox.

EDIT: It's the first frame that's the problem. Always add to a global value, and then check if the global value = 1 (or 2, if you add it before anything) before deleting the backdrops. It only deletes on the second frame or beyond, and won't ever delete on the first frame.

[chrilley]

It can be removed at frame 1 if it's a specific condition though. The overlap condition will remove it at frame 1 for instance.

Then this event won't do it at all no matter what frame you're on:
Always: Delete All Backdrops at layer 1

[casleziro]

That's weird. Seems like there might be a bunch of frame-lag problems in fusion that need to be addressed! This may be going off-topic a bit, but King_Cool and I both know how infuriating dealing with the collision update lag is

This bug here is a lot weirder than most, though.

[DaveC]

it seems to delete the object (visually) but not update the collision mask.. so definitely a bug.