FiveM Screen coords to world coords and get entity

CameraHelper.lua

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Copyright 2022 ZeroDream
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CameraHelper = {
    GetPosition = function()
        return GetGameplayCamCoords()
    end,
    GetRotation = function(unk)
        return GetGameplayCamRot(unk)
    end,
    DegToRad = function (degs)
        return degs * 3.141592653589793 / 180 
    end,
    RotationToDirection = function(rotation)
        local z   = math.rad(rotation.z)
        local x   = math.rad(rotation.x)
        local num = math.abs(math.cos(x))
        return vector3(-math.sin(z) * num, math.cos(z) * num, math.sin(x))
    end,
    WorldToScreenRel = function(worldCoords)
        local check, x, y = GetScreenCoordFromWorldCoord(worldCoords.x, worldCoords.y, worldCoords.z)
        if not check then
            return false
        end
        screenCoordsx = (x - 0.5) * 2.0
        screenCoordsy = (y - 0.5) * 2.0
        return true, screenCoordsx, screenCoordsy
    end,
    ScreenToWorld = function(giveX, giveY)
        local camVec2, camVec21
        camRot     = CameraHelper.GetRotation(2) + vec3(0, 45.0, 0.0)
        camPos     = CameraHelper.GetPosition()
        direction  = CameraHelper.RotationToDirection(camRot)
        camVec3    = camRot + vec3(10.0, 0.0, 0.0)
        camVec31   = camRot + vec3(-10.0, 0.0, 0.0)
        camVec32   = camRot + vec3(0.0, 0.0, -10.0)
        direction1 = CameraHelper.RotationToDirection(camRot + vec3(0.0, 0.0, 10.0)) - CameraHelper.RotationToDirection(camVec32)
        direction2 = CameraHelper.RotationToDirection(camVec3) - CameraHelper.RotationToDirection(camVec31)
        local rad  = CameraHelper.DegToRad(camRot.y)
        camVec33   = (direction1 * math.cos(rad)) - (direction2 * math.sin(rad))
        camVec34   = (direction1 * math.sin(rad)) + (direction2 * math.cos(rad))
        local find, screenX, screenY = CameraHelper.WorldToScreenRel(((camPos + (direction * 10.0)) + camVec33) + camVec34)
        if not find then
            return camPos + (direction * 10.0)
        else
            camVec2 = vec2(screenX, screenY)
        end
        local find2, screenX2, screenY2 = CameraHelper.WorldToScreenRel(camPos + (direction * 10.0))
        if not find2 then
            return camPos + (direction * 10.0)
        else
            camVec21 = vec2(screenX2, screenY2)
        end
        if math.abs(camVec2.x - camVec21.x) < 0.001 or math.abs(camVec2.y - camVec21.y) < 0.001 then
            return camPos + (direction * 10.0)
        end
        local x = (giveX - camVec21.x) / (camVec2.x - camVec21.x)
        local y = (giveY - camVec21.y) / (camVec2.y - camVec21.y)
        return ((camPos + (direction * 10.0)) + (camVec33 * x) + (camVec34 * y))
    end,
    RaycastForEntity = function(screenCoord, ignoreEntity, maxDistance)
        local world   = CameraHelper.ScreenToWorld(screenCoord.x, screenCoord.y)
        local camVec3 = CameraHelper.GetPosition()
        local camVec4 = world - camVec3
        camVec4       = norm(camVec4)
        local ray = StartShapeTestRay(camVec3 + (camVec4 * 1.0), camVec3 + (camVec4 * maxDistance), -1, ignoreEntity)
        local _, _, _, _, entity = GetRaycastResult(ray)
        return entity
    end
}

-- Example for getting entity in middle of the screen
local entity = CameraHelper.RaycastForEntity(
  vec2(0.5, 0.5), -- Screen position vector2
  PlayerPedId(),  -- Ignore self
  10.0            -- Max distance
)
-- print entity id
print(entity)