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README
Apache-2.0

objTo3d-tiles

将 obj 模型转换为 3D Tiles 的 Node 命令行工具以及 Node 模块, 基于obj2gltf

在线示例

注意: 目前只支持 .b3dm.i3dm

请使用 Cesium v1.37 或以后版本, 因为这里的 3D Tiles 使用 glTF2.0 。

开始使用

确保已经安装 Node , 然后

npm install -g obj23dtiles

基本用法

  • 转换 .obj.gltf
obj23dtiles -i ./bin/barrel/barrel.obj
// 在模型目录导出 barrel.gltf
  • 转换 .obj.glb
obj23dtiles -i ./bin/barrel/barrel.obj -b
// 在模型目录导出 barrel.glb

注意: 更多 .gltf.glb 的转换信息可以在 obj2gltf 查看。

注意: 如果你的模型中包含透明纹理,请添加 --checkTransparency 参数。

注意: 如果的模型使用 blinn-phong 材质, 当转换为PBR材质时使用遮蔽贴图会使模型看起来变暗。 所以 useOcclusion (使用遮蔽贴图) 默认为 false, 如果你的模型本身就准备使用PBR材质,请加 --useOcclusion 参数,这里有一些对比图。

  • 转换 .obj.b3dm 同时带有基础的属性表, 包含 batchIdname 属性, name 就是模型建模时的名字。
obj23dtiles -i ./bin/barrel/barrel.obj --b3dm
// 在模型目录导出 barrel.b3dm
  • 转换 .obj.b3dm,同时导出默认的属性表 (一个 JSON 文件)。可以从这个表中获取相关信息以便制作自定义属性表。
obj23dtiles -i ./bin/barrel/barrel.obj --b3dm --outputBatchTable
// 在模型目录导出 barrel.b3dm 和 barrel_batchTable.json
  • 转换 .obj.b3dm,使用自定义属性表。属性和模型对应关系靠 batchId 进行连接。
obj23dtiles -i ./bin/barrel/barrel.obj -c ./bin/barrel/customBatchTable.json --b3dm
// 在模型目录导出 barrel.b3dm
  • 转换 .obj.i3dm,使用自定义要素表
obj23dtiles -i ./bin/barrel/barrel.obj -f ./bin/barrel/customFeatureTable.json --i3dm
// 在模型目录导出 barrel.i3dm
obj23dtiles -i ./bin/barrel/barrel.obj -f ./bin/barrel/customFeatureTable.json
-c ./bin/barrel/customI3dmBatchTable.json --i3dm
// 在模型目录导出 barrel.i3dm

要素表目前可以使用以下属性控制模型 : position(位置),orientation(旋转),scale(缩放)。

创建单个瓦片

  • 创建一个 .b3dm 瓦片。
obj23dtiles -i ./bin/barrel/barrel.obj --tileset
// 在模型目录导出 Batchedbarrel 文件夹
  • 创建一个 .b3dm 瓦片,并自定义瓦片参数和属性表。
obj23dtiles -i ./bin/barrel/barrel.obj --tileset
-p ./bin/barrel/customTilesetOptions.json -c ./bin/barrel/customBatchTable.json
// 在模型目录导出 Batchedbarrel 文件夹
  • 创建一个 .i3dm 瓦片。
obj23dtiles -i ./bin/barrel/barrel.obj --tileset --i3dm
-f ./bin/barrel/customFeatureTable.json
// 在模型目录导出 Instancedbarrel 文件夹
  • 创建一个 .i3dm 瓦片,并自定义瓦片参数和属性表。
obj23dtiles -i ./bin/barrel/barrel.obj --tileset --i3dm
-f ./bin/barrel/customFeatureTable.json -p ./bin/barrel/customTilesetOptions.json
-c ./bin/barrel/customI3dmBatchTable.json
// 在模型目录导出 Instancedbarrel 文件夹

customTilesetOptions.json 配置文件可以包含以下信息, 这些都是虚拟值,请在文件中包含自己想修改的属性,没有出现的属性会根据模型自动计算。

{
    "longitude":      -1.31968,     // 瓦片原点(模型原点 (0,0,0)) 经度的弧度值。
    "latitude":       0.698874,     // 瓦片原点维度的弧度值。
    "transHeight":    0.0,          // 瓦片原点所在高度,单位为米。
    "region":         true,         // 使用 region 作为外包体。
    "box":            false,        // 使用 box 作为外包体。
    "sphere":         false         // 使用 sphere 作为外包体。
}

注意: 如果你没有指明 transHeight 属性,你的模型会被放置在高度为0的地表,无论你模型最低点是什么值。比如你有一个飞机模型,它在1000单位高度,那就会被放置在地面上,同样的道理如果你有一个潜艇,都在原点以下,也会被抬升到地面上。所以如果你想保留原始模型的相对高度,可以设置 transHeight = 0.0

这是不用的外包体示意图。

捆绑瓦片

你可以将多个瓦片捆绑为一个瓦片,每个瓦片作为外置瓦片集合到一个 tileset.json 中。

obj23dtiles combine -i ./bin/barrel/output/

作为 Node 模块使用

如果你想调试此工具或者在node中使用,可以看看如何作为Node模块使用

测试

导航到项目文件夹下,运行

npm run test

问题定位

首先,确保你的 .obj 文件是完整的,通常情况下包含 .obj.mtl 和纹理文件比如 .jpg.png。 如果你使用的 Win10, 可以使用自带的模型浏览工具 “Mixed Reality Viewer” 浏览你的 .obj 文件, 或者使用这个在线浏览工具

其次,使用此工具导出 .glb 然后查看是否现实正常,你可以使用Cesium 或者 Three.js gltf 浏览器。

最后,直接导出 .b3dm 或瓦片然后在 Cesium 中加载。

样例数据

示例代码中的样例数据在 .bin\barrel\ 文件夹下。

barrel\
    |
    - barrel.blend              --
    |                             |- Blender 工程文件和纹理
    - barrel.png                --
    |
    - barrel.obj                --
    |                             |- Obj 模型文件
    - barrel.mtl                --
    |
    - customBatchTable.json     ---- b3dm 使用的属性表例子
    |
    - customTilesetOptions.json ---- 自定义瓦片配置文件
    |
    - customFeatureTable.json   ---- i3dm 使用的要素表例子
    |
    - customI3dmBatchTable.json ---- i3dm 使用的属性表例子
    |
    - output\                   ---- 导出的数据
        |
        - barrel.glb
        |
        - barrel.gltf
        |
        - barrel_batchTable.json    ---- 默认属性表
        |
        - Batchedbarrel\            ---- 使用 b3dm 的瓦片
        |   |
        |   - tileset.json
        |   |
        |   - barrel.b3dm
        |
        - Instancedbarrel\          ---- 使用 i3dm 的瓦片
        |   |
        |   - tileset.json
        |   |
        |   - barrel.i3dm
        |
        - BatchedTilesets\          ---- 自定义配置文件的瓦片
            |
            - tileset.json
            |
            - barrel_withDefaultBatchTable.b3dm
            |
            - barrel_withCustonBatchTable.b3dm

相关资源

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