Much like a stalker with a day job, I disappear then come back to this site. The title for that sucks, but basically I'm taking another shot at a game. Basically there are one way platforms for the player to jump on from under them. That works fine. The platform works by getting the player's y positioning then determining whether to turn on the mask for its collision or not based on the player's height. That also works fine. However, it works too fine. When the player is standing under the one way platforms, enemies and other objects that collide with the one way platforms will pass through them since the collision mask is turned off. Since I have the coding skills of a whale wearing mittens, I don't have the slightest clue on how to approach the solution. The solution being to separate the player object from other objects that the one way platforms checks for, so it can turn off collision from the bottom sides when the player is under the platform without affecting non-player objects using the platforms.

I'm just taking a wild guess, but would it be possible to create two identical versions on top of each other, one affecting the player only while the other one affects enemies only?

[quote="littlelum"]I'm just taking a wild guess, but would it be possible to create two identical versions on top of each other, one affecting the player only while the other one affects enemies only?[/quote] Maybe, but a brute force option like that generally doesn't work well for optimization, nor for keeping the level's tidy and easy to edit. I'd rather have a clean solution than brute forcing it.

I don't use game maker so if this solution isn't possible, sorry. But maybe: Try turning the thing's mask on from the code in the player object before the player tests collisions, then turning it right back on?

[quote="HylianDev"]I don't use game maker so if this solution isn't possible, sorry. But maybe: Try turning the thing's mask on from the code in the player object before the player tests collisions, then turning it right back on?[/quote] Turning off the collision for all objects for the platform would mean, even if collision was off for just a step, the enemies and such using it would fall through it.

create 2 types of solid objects let's call them obj_solid and obj_solidtop make it so obj_solid's parent is obj_solidtop then make it so the wall and ceiling collision codes only apply to obj_solid while the ground collision code only applies to obj_solidtop

[quote="moonrat"][quote="HylianDev"]I don't use game maker so if this solution isn't possible, sorry. But maybe: Try turning the thing's mask on from the code in the player object before the player tests collisions, then turning it right back on?[/quote] Turning off the collision for all objects for the platform would mean, even if collision was off for just a step, the enemies and such using it would fall through it.[/quote] It wouldn't be for a step, it would only be from the beginning of Mario's collision code to the end of it. All of the game objects are in a linear list and their step functions run one by one. Their code will not run in the middle of Mario's code.

[quote="Mors"]create 2 types of solid objects let's call them obj_solid and obj_solidtop make it so obj_solid's parent is obj_solidtop then make it so the wall and ceiling collision codes only apply to obj_solid while the ground collision code only applies to obj_solidtop[/quote] Listen to Mors This seems most logical. I had the same exact problem before!! Of course I didn't know what to do either. This is perfect, as if someone didn't know this at the same time I've been trying to figure this out!!! Thanks Mors

I always just had the player's collision check which object it's colliding with, and disregard vertical collisions with jumpthrough platforms, but that's just me.