Trying to understand tilemap collision detection

Hi I'm playing around with tilemaps and how they detect collisions.

Check out the following setup;

dropbox.com/s/p0kc3ys5922hutw/TilemapCollisions.capx

Why aren't the tiles being erased properly please? It seems collisions on tiles are only at the top left of each tile but, I don't know how to offset this correctly.

Thanks,

Dave

Right - I don't know much about tilemaps. (Or many things come to think about it...) In fact this is one of my first looks at tile maps so take this with a pinch of salt, ok ?

I think that when you are getting the sprites x and y then it is not quite over the tilemap - so when it hits the far left of the tilemap the sprites x is referencing -1 on the tilemap (if sprite hits the right then it is referencing tilemap "width" +1 (19 in this case). Same for the y positions.

How to fix this ? Not sure and too tired to think straight - Here is an (almost) solution but....

test

Thanks I appreciate the help, I have now solved it by using the following.

bullet Overlapping Tilemap

--- For "cycletiles" 0 to (amount of tile types)

---- Tile (Tilemap.PositionToTileX(bullet.x), Tilemap.PositionToTileY(bullet.y)) = loopindex("cycletiles")

Please post the updated capx ?

No probs, here you go;

dropbox.com/s/xzml5v3b1lqwa42/updatedtilemapcollisions.capx

Thanks for that.

I knew there had to be a better solution than the one I tried !

I've had another look and made a couple of alterations.

Slight edit

Far better way of doing it, thanks

MiniHulk would you be able to repost your capx?

here is my edit if you want

https://goo.gl/lHsP2c

RamPackWobble This is great stuff, but it doesn't seem to work when the tilemap has a solid behavior.

This is perfect. Exactly what I need. Cheers!

— Actually I have tested and it works when tilemap has solid behavior.