Rebuilding Lineage 2 (Interlude) in Godot

Built with a lot of help from AI, mostly for the asset extraction and the scripts.

I played Lineage 2 since C1, back when I was in high school. I spent way too many hours in those grind spots, and I met a lot of people there, some of them became real friends. I always missed those days.

So I started taking the old Interlude client apart and rebuilding its world inside Godot 4. This is my notebook for it. I write down what I did, what worked, and what broke, mostly so I do not forget.

Link to Part 1

  1. Part 11

    The project is growing, and updates are moving

    October 2, 2026

    L2Godot has grown a lot, and more people are interested. This is the final technical devlog entry; development continues, with updates on the website, Discord and YouTube.

  2. New trees and real grass
    Part 10

    New trees and real grass

    September 26, 2026

    A side project on the visuals. Every tree in the world can be swapped for a real 3D tree model, and the ground gets a carpet of grass blades. Both are options, the original look is still one click away.

  3. Sharper textures, and a bit of depth
    Part 9

    Sharper textures, and a bit of depth

    September 21, 2026

    The original textures are 128 to 512 pixels wide. I ran the whole library through an AI upscaler, kept the ones I liked, and generated normal maps for walls and stone so they catch the light.

  4. Old effects or new ones, your pick
    Part 8

    Old effects or new ones, your pick

    September 8, 2026

    The ported effects can never be a perfect copy of the client, so instead of only chasing the original I added a second set of my own, built with Godot shaders, and a switch to choose between them. Death Spike is the first one done both ways.

  5. Skills, and reading the client to fake its effects
    Part 7

    Skills, and reading the client to fake its effects

    September 7, 2026

    Getting skill effects to look like Lineage 2 meant reading the original client's own code, fighting Godot's particle system, and in the end writing the whole thing myself in C#. It is early and a lot of it is still wrong.

  6. Items, combat, and other players
    Part 6

    Items, combat, and other players

    September 3, 2026

    The inventory works with real items, names and stats pulled from the client files. My character can actually hit the wolves now, and I can attack another player.

  7. Real bodies and a real sky
    Part 5

    Real bodies and a real sky

    August 31, 2026

    A shorter update. The capsules are gone, my character is the real Lineage 2 fighter model with real animations, and the world now has a real day and night sky pulled straight from the client.

  8. Decrypting multiplayer data
    Part 4

    Decrypting multiplayer data

    August 29, 2026

    Part 3 got me connected. This time I made the world real: decoding the game packets with L2J as my guide, pulling the NPC names out of the client files, fixing collision with real geodata, and finally seeing our client render the same world as the official one, side by side.

  9. Going multiplayer, talking to an L2J server
    Part 3

    Going multiplayer, talking to an L2J server

    August 28, 2026

    I was about to start placing characters and NPCs by hand, then I thought this would be way more fun as a real multiplayer game. So I connected the Godot client to an L2J server, got login working, and let the server tell me where my character and the monsters are.

  10. Buildings, trees, water and sky
    Part 2

    Buildings, trees, water and sky

    August 27, 2026

    The second step. Putting the static meshes, the trees, the water and the sky onto the terrain. Plus the rotation math from Unreal that almost broke me, until I copied l2mapper to understand pitch, yaw and roll.

  11. Getting the map terrain out of Lineage 2 and into Godot
    Part 1

    Getting the map terrain out of Lineage 2 and into Godot

    August 21, 2026

    First step. Pulling the terrain and textures out of the old Interlude client and rebuilding one Talking Island tile in Godot 4, with the real shape, textures and shaders. Plus the walls I hit.