Ensure that the lower and upper sectors are tagged appropriately in all areas they are used.

Check that your ‘anchor lines’ as I refer to them in this tutorial are in the same position relative to eachother.

Below is a list of things to check if you’re having issues: As with any advanced mapping technique, there’s a plethora of things that could potentially go wrong with sector portals. Line portals as covered in this tutorial are “ easy peasy“, but sector portals can be tricky stuff when you first start out. Take note of how the ceiling of the “lower inner sector” lines up with the floor of the “upper inner sector” – these will be the parts we attach together with portals and they need to connect at the same height for it to work. In the inner sector, set the floor to 192 and the ceiling to 384. With the newly copied room, modify the floor/ceiling heights as following: In the outer ring, make the floor 256 and the ceiling 384. When we connect the portal we will want the geometry to line up rather than be misaligned – this prevents your map having “void leaks” which would allow the player to get out of bounds without using cheats… unless you’re looking to make a glitchy mess that could crash the game on purpose, avoid this at all costs!

I recommend using copy & paste instead of re-drawing this room to ensure the measurements are correct. If you’re unsure of how this should look, reference the below screenshot. In the center of this room, we’ll draw a 256×256 square and increase the ceiling height to 192. To keep this tutorial simple, lets start with a basic, detail-less room which is 512x512px in size, with a floor height of 0 and a ceiling height of 128. To have stacked sectors in our map we need a ‘top half’ and ‘bottom half’ for our portals to connect. First Of All, Create The Two Basic Rooms We’re Going to Connect With a Portal Incidentally this means you’ll need to make sure that the ‘holes’ in each room are the exact same measurements so that the portal lines up. Refer to the picture below if you’re unsure. If you know only a player is going to pass through, you can get away with having it 64px deep but there’s little reason this would be the case. The deepness of the portal defines what can and cannot pass through it, so as a precaution I would recommend leaving more space behind it in case a larger creature tried to pass through, such as an Arachnotron. Once your rooms either side of the portal are ready, draw an empty space connected to each of the portal’s lines that is at least 128px deep. Ensure that the floor and ceiling heights are identical on both sides of the portal, otherwise this will not work properly! In this example we’re making a portal that measures the same as a standard door (128 x 128). Lets start by creating the rooms that make up each ‘half of the portal’ first. Bare in mind that this is the hardest to work with as the lines defining both sides of the portal must be the same length and angle.

The same as interactive but now it displays on the automap as connected, too.

A lot like teleporter, however projectiles can pass through it and feels more ‘natural’.Walking through one side of the portal teleports you to the opposite side.Imagine this essentially like a ‘HD 3D Camera Texture’. It’s worth noting that there’s 4 types of line portal: The easiest way to think of them is functionally like a teleporter, but visually like you’re ‘snapping two separate parts of the map together’. Line portals create a seamless transition from two areas that are separated in the map. Line portals are the easiest portal to make – I dare say they are easier to build than a teleporter! Let’s start with the uses for this kind of portal and what it does.

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