Modding Help Issue with lineTileCollision

Hello, I'm using this line of code to find out if any blocks are above the player in order to apply a bonus and the problem is that it apparently detects a collision in the sky. So I'm wondering if it's not the ship that's following the player in a fixed way, or if there's some kind of invisible block in the sky (this second point seems impossible to me, as I've seen a player go into space from the ground). Do you have any idea where this might come from? I'd like to be able to increase the +50 detection limit, but if it detects a collision when nothing is above it, that's a problem for the mod I want to make for vampires.

Code:

local position = mcontroller.position()
local isUnderRoof = world.lineTileCollision(position, {position[1], position[2] + 50})

Edit : It's the asteroids that are the problem, I don't know how to exclude this material without it breaking the stat variables.

 

Why do you need to detect if there's a roof specifically?

Maybe you could detect something else that gives a similar if not perfect result by detecting things such as light levels, depth levels, if you're behind a background wall, a combination, or other detecting thingies.

 

Here a function I use in my mod. It returns true when there is a collision except if the collision material is inside the exceptionlist. It resumes the scan with the remaining scan range if there is a collision with an excluded material.

Code:

function RoofDetection(position, scanHeight, materialExceptions)
    local roofCollisionPoint = world.lineTileCollisionPoint(position, vec2.add(position, {0, scanHeight}))
    if roofCollisionPoint then
        local roofMaterial = world.material(vec2.add(roofCollisionPoint[1], {0,.25}), "foreground")
        if roofMaterial then
            for i, mat in ipairs(materialExceptions) do
                if roofMaterial == mat then
                    local newstartPos = vec2.add(roofCollisionPoint[1], {0, 1.5})
                    local newScanHeight = math.max(0, scanHeight - (world.distance( roofCollisionPoint[1], position)[2]))
                    if newScanHeight >= 1 then
                        return RoofDetection(newstartPos, newScanHeight, materialExceptions)
                    end
                    return false
                end
            end
            return true
        end
    end
    return false
end

Example call using your scan range and materials (plus glass):

Code:

local isUnderRoof = RoofDetection(mcontroller.position(), 50, {"meteoriterock", "magmarock", "glassmaterial"})

Visualization of how it works:

pink dot = collision point, yellow dot = new start position, yellow text = remaining scan range, white text = debug output based on isUnderRoof (following the example call)