How do I make background stuff move up and down like the clouds in the Mario Challenge hub?

[Chilly14]

If you don't know what I mean, take a look:

See those clouds the ship is above? I want my background elements to move up and down the exact same way those clouds do.

[Emral]

around line 304 in luna.lua of the mario challenge hub level

[Chilly14]

This happens:

Code:

Code: Select all

local paralx = API.load("paralx2")

local fade = 1

Block.config[751].ceilingslope = 1
Block.config[752].ceilingslope = -1
Block.config[755].floorslope = -1
Block.config[756].floorslope = 1

function onTick()
	fade = fade - 0.01

	for k,v in ipairs(bgObj:get()) do
		if(v.name:match("^clouds%d+$")) then
			v.speedY = 0.8*math.sin(lunatime.tick()*0.02*k);
		end
	end
end

function onDraw()
	Graphics.drawScreen{color = Color.black .. fade, priority = 5}
end

[Emral]

You didn't copy the piece of code where the variable is initialized, so of course it's nil.
bgObj is probably initialized in an onLoadSection event and refers to the parallaxing background of the section.