obj-import

Obj Importer

Bring a finished Blender scene into Minecraft as one whole model — real geometry, real materials, walkable interior — instead of rebuilding it block by block.

Features

• OBJ and glTF — .obj with .mtl, and .glb (glTF 2.0 binary exported straight from Blender).
• Per-material rendering, PBR-ready — each material is drawn separately; with Iris / Oculus installed the normal, metallic and roughness maps are used, otherwise it falls back to vanilla lighting.
• Interiors you can actually walk into — box objects named col: become multiple AABBs, and a doorway is just a hole without a collider.
• Parts you can click — col:door@open makes a collider that toggles an animation, use:x adds an invisible interaction box, and $key runs a command from commands.json (give, scoreboard, story triggers, TACZ guns, anything a command can do).
• Placements that survive a reload — position, yaw and scale are written into the world save, restored when the chunk reloads, and resynced when a player rejoins.
• Independent parts — every placement gets its own id, so two identical doors open and close separately instead of sharing one animation state.
• Server-authoritative — the server owns placements and colliders; clients only render. The same world behaves the same for everyone.

Installation

1. Minecraft 1.21.1 with NeoForge (Java 21).
2. Drop the jar into mods/.
3. Install on both client and server — the mod registers entities and manages placements server-side.
4. Optional: Iris / Oculus for PBR materials and shader lighting.

Quick start

1. Put the model file into config/obj_importer/models/ (subfolders are fine).
2. In game, run:

/objplace ~ ~1 ~ 0 1.0 models/building.glb

<x y z> accepts ~ relative coordinates, <yaw> is in degrees, <scale> is 0.01–100, and the last argument is the file reference.

1. To remove it: /objlist shows the ids, /objremove <id> deletes one, /objclear wipes all placements.

Marking boxes in Blender

Markers are plain box objects. Their name is the behavior, and they are exported inside the same .glb as the model:

Details: thin walls should be at least 0.25 blocks thick, $command must come after @animation, and a light box is capped at 512 positions. A model containing col: boxes can only be placed at yaw 0 / 90 / 180 / 270, so colliders stay axis-aligned with the visual.

Commands

Who is this for

Map makers and modpack authors who model in Blender instead of in-game; adventure maps that need real doors, machines and set pieces; sci-fi or industrial packs that want geometry Minecraft cannot express with blocks. It is not a furniture pack and adds no items of its own — it is the pipeline between your DCC tool and the world.

Performance notes

Geometry is uploaded to the GPU per placement, so a 100 MB+ scene takes noticeably longer to parse and costs VRAM. Practical advice: split huge scenes into several models, keep textures reasonable, and use scale instead of modelling at 4× size.

Credits

The glTF and OBJ implementations were written from scratch, informed by reading MCglTF (glTF animation and PBR vertex handling) and MCObj (OBJ/MTL parsing layout). Thanks to both authors for keeping their code readable and licensed.

License

MIT. Free to use in modpacks; a credit and a link back are appreciated.

It's recommended to use it together with the source code

中文说明

把在 Blender 里做好的建筑、机械、地景整套搬进 Minecraft：模型作为一个整体渲染，不是用方块拼出来的。

• 支持 OBJ / glTF：.obj（含 .mtl）与 .glb（Blender 直接导出的 glTF 2.0 二进制）。
• 多材质 + PBR：分材质绘制；装 Iris / Oculus 后法线、金属、粗糙度生效，未装退回原版光照。
• 能走进去：col: 标记盒生成多 AABB 碰撞，门洞不放盒子就是通道。
• 能点：col:door@open 做可开关的门，use:x 做交互盒，$命令键 右键直接执行 commands.json 里的命令。
• 能存：坐标、yaw、缩放写入存档，区块重载自动恢复，玩家重连自动补齐。
• 每个摆放独立：两扇同款门各自开关，不共享动画状态。
• 服务端权威：摆放与碰撞由服务端管理，客户端只负责渲染。

安装：Minecraft 1.21.1 + NeoForge，jar 放进 mods/，客户端和服务端都要装，PBR 需另装 Iris / Oculus。

快速开始：模型放进 config/obj_importer/models/，执行 /objplace ~ ~1 ~ 0 1.0 models/building.glb；/objlist 看 id，/objremove <id> 删除，/objclear 清空。

标记盒（Blender 里普通 box，命名即语义，随模型导出到同一个 .glb）：col: 碰撞、col:door@open 碰撞+开关动画、use:button$press 交互盒+命令、light:lamp@15 光源盒（1~15 级）。薄墙 ≥ 0.25 格，$ 必须写在 @ 之后，光源盒上限 512 格；含 col: 的模型 yaw 只能取 0/90/180/270。

授权：MIT，可自由用于整合包，署名与回链是加分项。

建议与源码搭配使用。