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does happen a lot, especially when they hit an uneven spot of a wall or have a great velocity.
is there a good way to avoid this?

If a object travels with xvelocity 15, it means it jumps to every 15 pixel.

Two ways to avoid flying through walls:
-make thicker walls
-reduce actor max speeds

tekdino wrote:make thicker walls

good point, thx you mention it.

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there were some cases when walls of this thickness couldn't hold'em back.

Yeah, when the pixel velocity is wall thickness + 1.
How big speed values you get in your game?

Try increasing the frame rate.

oo oo i know, maybe theres something wrong with your animation, like maybe once it changes to the frame thats wrong it makes like a part of your actor move into the wall and that makes it go all the way through

make sure that in the collision event bit, you select "yes" to "repeat this event while actor is colliding".

Works most of the time for me.

You can also try 'collision free'.

Caaz Games wrote:oo oo i know, maybe theres something wrong with your animation, like maybe once it changes to the frame thats wrong it makes like a part of your actor move into the wall and that makes it go all the way through

that's often the case, but it isn't the main problem.

tekdino wrote:Yeah, when the pixel velocity is wall thickness + 1.
How big speed values you get in your game?

maybe you're right, I should reduce the speed a little.

JayInACob wrote:make sure that in the collision event bit, you select "yes" to "repeat this event while actor is colliding".

Works most of the time for me.

lol, I always do that =D
there's no way around it.

DST wrote:You can also try 'collision free'.

ummmmmmmmmmmm 'kay.

i just posted a demo to the demo section which shows how to use the collisionfree function to stop you sliding thu walls even if they are 1 pixel thick and you are travelling at a velocity of a 100.

i assume this is what DST was thinking of.

viewtopic.php?f=6&t=5768

hope it helps
feral