Collide rules not always working

FirstDan

Hi

Can someone help me out? I'm jumping through a platform and landing on top, sometimes it will collide correctly but other times my player will fall through it!

Advice would be greatly appreciated

Thanks

Dan

The_Gamesalad_Guru

Post your code for us.

FirstDan

@fryingbaconstudios- thanks for your reply

Rule
When
self.Position.X -( self.Size.Width /2)-( game.playerswidth /2)
self.Position.X +( self.Size.Width /2)+( game.playerswidth /2)
self.Position.Y +( self.Size.Height /2)+( game.PlayersHight /2)

Collide

End

When player collides with platform actor
Constrain self.motion.linear. X= 0 and the same for y...
Else
Change velocity

Cheers

Dan

The_Gamesalad_Guru

You should be tracking the main players x & y through real gamelevel attributes and that code I see no operators. Have you seen this video?

FirstDan

@FryingBaconStudios - yes i have watched the video many times

game.playersX > self.Position.X -( self.Size.Width /2)-( game.playerswidth /2)
game.playersX < self.Position.X +( self.Size.Width /2)+( game.playerswidth /2)
game.playersY>=self.Position.Y +( self.Size.Height /2)+( game.PlayersHeight /2)

collide with player

Very confusing

Anyone out their to help?

Dan

The_Gamesalad_Guru

You have that rule at the top of the list in the platform. Have you tried an adhoc to test it? The viewer is not reliable, it could be working perfectly fine but the viewer
fps are not very good. I will do a test model and see.

FirstDan

@ Frying bacon studios - I'm testing it on adhoc, I did read that collide happens so fast that it skips!!

The_Gamesalad_Guru

I just tested it out and it works fine. I would make sure your constrains are at the top of the code in the actor and the rule in the platform for collide at the top too. What are the FPS of your game?

FirstDan

50-60, my platform moves up and down. Can that be why?

LooseMoose

I had this problem a while ago. My hero would not land on the platform if there was another platform that was higher than the platform I was trying to land on.

FirstDan

@kyukon- that's exactly my pickle!! Did you find a fix?

LooseMoose

Without seeing how your game is set up I'm not sure this would be the best solution, but you could try unlocking all of your platforms if you don't have too many and put a rule in them like this. (this method doesn't need constraints)

Platform rule:
If self.position y + (self.height/2) is less than hero.position y - (self.height/2 + 5)
Collide with Hero

The + 5 in the hero equation is just to give you some leeway incase the pixels slip lower than expected due to gravity.

I hope this method works for you, I'm going out now but I will be back later if you still need some help.

The_Gamesalad_Guru

Yes a moving platform would create possible problems.

tharbk01@yahoo.com

Hey I am having a similar problem. I have set my player character to have a rule :
bounce when colliding with tag "Collide w/player". It had been working fine, but suddenly while adding a main menu and pause menu, i played it, and my character was no longer bouncing off anything at all. The strange thing is that when I bring in a new instance of lets say the actor that functions as the ground, it collides fine with that. Its the same actor as the ground actor that was already on the scene but the older instances dont work at all. The only way it starts working again is if i drag in new instances or i manually unlock the instances already on the scene and add a new bounce rule for that individual actor.

statesman88

Thank you, tharbk01! I've been having the same problem, and dragging out new instances fixed it. For now, anyway. I also found that behaviors work better in Windows Creator when I tell them to look for actors rather than tags. I didn't have this problem in Mac Creator.

matarua

@kyukon > This example below - how do you do it with rules?

When you write a rule you can use the expression editor in the first instance.

So the best you can do is self.positionY (then is - greater / equal / less) -

How do you make a rule that does what you say below?

Without seeing how your game is set up I'm not sure this would be the best solution, but you could try unlocking all of your platforms if you don't have too many and put a rule in them like this. (this method doesn't need constraints)

Platform rule:
If self.position y + (self.height/2) is less than hero.position y - (self.height/2 + 5)
Collide with Hero

The + 5 in the hero equation is just to give you some leeway incase the pixels slip lower than expected due to gravity.

I hope this method works for you, I'm going out now but I will be back later if you still need some help.

Many thanks

LooseMoose

@matarua that code was for windows creator but for mac you could try this:



This code was to let my hero land on the platform when falling down onto it but not collide when the hero is jumping up through it.

matarua

I have tried to optimize this greatly and seem to have done it by using transparent platforms that are in fact only 1px high. So all the code is

game.heroY > self.Position.Y >>>>>>> collide.

I have had issues with the player falling through the platform at times. Gamesalad is having to constrain my attribute all the time and then do a mathematical equation on top of that. I decided to simplify it greatly.

This is perfect for my game. But for some it might not be good having more actors. The platforms are also a pain to work with on stage so you do that manually through the scene inspector.

I have not fallen through my platform since - lets hope I don't! Cheers