Need help with collisions. STI and bump

[meganukebmp]

Hello so I am using STI to load a tiled map and bump for collisions. Sadly STI's bump plugin documentation is none. I did a bunch of guesswork and achieved nothing. Then I stumbled upon the demo in the attachments and tried using parts of its code but to no avail. Can someone please help me understand how all of this works. A git of the project is available here: https://github.com/meganukebmp/Soul-Shift

[bobbyjones]

https://github.com/Bobbyjoness/Boredom/ ... r/main.lua

Here is a small example. To get it to work in 0.10.0 you just have to change the "l" in mousepressed to "1".

[meganukebmp]

https://github.com/Bobbyjoness/Boredom/ ... r/main.lua

Here is a small example. To get it to work in 0.10.0 you just have to change the "l" in mousepressed to "1".

Might I get a bit of explanation on this part of the code. I know it handles collisions but how?

Code: Select all

player.xvel = player.xvel - 50
	
	player.yvel = player.yvel + GRAVITY

	if player.xvel > player.maxVelocityX then player.xvel = player.maxVelocityX end

	if player.xvel < 0 then player.xvel = 0 end

	player.x = player.x + player.direction*player.xvel*dt

	player.y = player.y + (player.yvel)*dt

	player.x, player.y, cols = world:move( player, player.x, player.y )

	for i,v in ipairs (cols) do
		if cols[i].normal.y == -1 then
			player.yvel = 0
			player.grounded = true
			debug = debug.."Collided "
		elseif cols[i].normal.y == 1 then
			player.yvel = -player.yvel/4
		end
		if cols[i].normal.x ~= 0 then
			player.xvel = 0
		end
	end

[bobbyjones]

world:move will move an object to a specified x and y. If the object collides along the way it will return the new x and y along with a collision list (cols) I then get the normal so that I can edit my velocity correctly. The rest is just regular movement code. I apologize if I explained poorly. I'm on my phone. I will write up a better explanation later if you need it.

[meganukebmp]

world:move will move an object to a specified x and y. If the object collides along the way it will return the new x and y along with a collision list (cols) I then get the normal so that I can edit my velocity correctly. The rest is just regular movement code. I apologize if I explained poorly. I'm on my phone. I will write up a better explanation later if you need it.

No problems. So the world moves oposed to the player. Interesting.

[s-ol]

world:move will move an object to a specified x and y. If the object collides along the way it will return the new x and y along with a collision list (cols) I then get the normal so that I can edit my velocity correctly. The rest is just regular movement code. I apologize if I explained poorly. I'm on my phone. I will write up a better explanation later if you need it.

No problems. So the world moves oposed to the player. Interesting.

It's not that world:move means "move the world", it means "World [, container of all objects], move the player":

Code: Select all

newx, newy, collisions = world:move( player, attempted_x, attempted_y )

Might be more understandable if you pretend :move is called :moveItem

[meganukebmp]

world:move will move an object to a specified x and y. If the object collides along the way it will return the new x and y along with a collision list (cols) I then get the normal so that I can edit my velocity correctly. The rest is just regular movement code. I apologize if I explained poorly. I'm on my phone. I will write up a better explanation later if you need it.

No problems. So the world moves oposed to the player. Interesting.

It's not that world:move means "move the world", it means "World [, container of all objects], move the player":

Code: Select all

newx, newy, collisions = world:move( player, attempted_x, attempted_y )

Might be more understandable if you pretend :move is called :moveItem

Aha. Got it. Thanks for explaining