how do you make collision for ground, roof, and walls?

Depends on the context. Are you doing a platformer, or are you doing a top down based game?

in any case, the concept of collisions against walls is to push the character out of the walls until they are completely out of the walls entirely.

when green flag clicked
forever
change x by (5)
if <touching (walls v)> then
check wall
end
define check wall //[✔] Run without screen refresh.
repeat until <not <touching (walls v)>>
change x by (-1)
end

What is this for?

Hi,
This tutorial may be of use to you.

NMario84 wrote:

Depends on the context. Are you doing a platformer, or are you doing a top down based game?

in any case, the concept of collisions against walls is to push the character out of the walls until they are completely out of the walls entirely.

when green flag clicked
forever
change x by (5)
if <touching (walls v)> then
check wall
end
define check wall //[✔] Run without screen refresh.
repeat until <not <touching (walls v)>>
change x by (-1)
end

Thanks! by the way this is a platformer

theContemplator wrote:

Hi,
This tutorial may be of use to you.

the tutorial worked! thank you so much