b3dm ~ ( Batched 3D Model )
2024-05-15 13:01:00
目录
1. b3dm 概念解析
1. What‘s b3dm
2. b3dm 格式的数据结构有两部分组成 : header / body
1. b3dm 数据也是基于 gltf 的 ( 单模型基础上做了批量化处理 )
3. b3dm 文件解析
1. 局部文件 解析结果 ( 临时方案 )
BATCH_LENGTH
id[] / revitId[] / properties[]
JSON
1. b3dm 概念解析
b3dm 是一个缩写，它的全称是：Batched 3D Mode ( 批量化 3d 模型 ) , 顾名思义，批量化指的是一定有很多个，不止一个
Batched 3D Model allows offline batching of heterogeneous 3D models, such as different buildings in a city, for efficient streaming to a web client for rendering and interaction. Efficiency comes from transferring multiple models in a single request and rendering them in the least number of WebGL draw calls necessary. Using the core 3D Tiles spec language, each model is a feature.Per-model properties, such as IDs, enable individual models to be identified and updated at runtime, e.g., show/hide, highlight color, etc. Properties may be used, for example, to query a web service to access metadata, such as passing a building's ID to get its address. Or a property might be referenced on the fly for changing a model's appearance, e.g., changing highlight color based on a property value.A Batched 3D Model tile is a binary blob in little endian.--------------------------------------------------------------------------------------------------------译文：b3dm允许不同类型的3d模型，例如城市里不同的建筑，组织成高效的数据流到web端渲染和交互，这种高效率来自于一次请求转化多个模型并且用最少的webGL消耗。在3d tiles特殊的语言中，每一个模型都是一个要素。每一个模型的属性，例如ID能够将模型分离成单个的个体，同样也能对这些模型做更新，颜色变化，是否展示等这样的操作，模型的属性也会有所使用，举个例子来说，通过网络服务去访问元数据，通过建筑的id去访问它的地址，或者动态的属性决定模型外观，根据属性值来改变颜色高度。
1. What‘s b3dm
b3dm 瓦片 是一个 二进制 的 blob
b3dm 也是一种数据格式，这种格式符合3d tiles规范，能够做一些操作，比如说查询，分层设色等。
b3dm 格式的数据通常都是城市的批量化的建筑模型，例如 , 倾斜摄影模型。在实际的生产应用中，倾斜摄影（或者别的格式的大批量模型）的格式并不是b3dm 格式的，绝大多数的倾斜摄影模型格式是 osgb，还有一部分是 obj，所以我们需要把它转化成 b3dm 格式的数据，才能进行进一步的操作。
2. b3dm 格式的数据结构有两部分组成 : header / body
b3dm 格式的数据结构有两部分组成，header 和 body（ 有点像 html ）
header 部分主要记录了一些 例如版本，字节长度之类的信息。
body 部分主要由3个文件构成 feature table batch table 和 binary gltf
feature table 记录了模型的语义信息，包括每个模型的特征值信息。
batch table 记录了模型的样式以及 rest 请求，还有一些属性信息。
1. b3dm 数据也是基于 gltf 的 ( 单模型基础上做了批量化处理 )
注意 ：
b3dm 数据也是基于 gltf 的，也就是说批量的模型中的单个模型的模型格式还是 gltf，并且数据组织方式也和之前讲到过的 gltf 是一样的。
说白了 b3dm 就是在原来 gltf 小模型，单个模型的基础之上，做了批量化的数据组织方式，多了 feature table 和 batch table 两个文件。
3. b3dm 文件解析
1. 局部文件 解析结果 ( 临时方案 )
数据源 准备阶段1、通过 WinHex 解析 b3bm 格式文件2、截取 解析正常的部分数据3、截取部分 另存为xxx.txt 文件4、通过 json 工具类 校验格式-------------------------------------------------------解析数据数理化阶段1、抽象统一解析 保存好的 JSON 格式文本文件2、所需数据实例化至数据库
BATCH_LENGTH
{"BATCH_LENGTH": 23}
id[] / revitId[] / properties[]
{"id": 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"中","宽度": "200 mm","高度": "100 mm","参照标高": "管线综合","偏移": "3400.00 mm","开始偏移": "3400.00 mm","端点偏移": "3400.00 mm","长度": "20043.04 mm"},{"图像": "<无>","底部高程": "3350.00 mm","顶部高程": "3450.00 mm","尺寸": "200 mmx100 mm","标记": "2265","标高前缀": "BL","桥架类型": "CT","创建的阶段": "新构造","拆除的阶段": "无","水平对正": "中心","垂直对正": "中","宽度": "200 mm","高度": "100 mm","参照标高": "管线综合","偏移": "3400.00 mm","开始偏移": "3400.00 mm","端点偏移": "3400.00 mm","长度": "18723.21 mm"},{"图像": "<无>","底部高程": "3240.00 mm","顶部高程": "3340.00 mm","尺寸": "200 mmx100 mm","标记": "2266","创建的阶段": "新构造","拆除的阶段": "无","水平对正": "中心","垂直对正": "中","宽度": "200 mm","高度": "100 mm","参照标高": "管线综合","偏移": "3290.00 mm","开始偏移": "3290.00 mm","端点偏移": "3290.00 mm","长度": "249.24 mm"},{"图像": "<无>","底部高程": "3350.00 mm","顶部高程": "3450.00 mm","尺寸": "200 mmx100 mm","标记": "2284","标高前缀": "BL","桥架类型": "CT","创建的阶段": "新构造","拆除的阶段": "无","水平对正": "中心","垂直对正": "中","宽度": "200 mm","高度": "100 mm","参照标高": "管线综合","偏移": "3400.00 mm","开始偏移": "3400.00 mm","端点偏移": "3400.00 mm","长度": "18723.21 mm"},{"图像": 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"200 mm","高度": "100 mm","参照标高": "管线综合","偏移": "3343.59 mm","开始偏移": "3343.59 mm","端点偏移": "3346.41 mm","长度": "5.64 mm"},{"图像": "<无>","底部高程": "3350.00 mm","顶部高程": "3450.00 mm","尺寸": "100 mmx100 mm","标记": "2270","标高前缀": "BL","桥架类型": "CT","创建的阶段": "新构造","拆除的阶段": "无","水平对正": "中心","垂直对正": "中","宽度": "100 mm","高度": "100 mm","参照标高": "管线综合","偏移": "3400.00 mm","开始偏移": "3400.00 mm","端点偏移": "3400.00 mm","长度": "10853.27 mm"},{"图像": "<无>","底部高程": "3350.00 mm","顶部高程": "3450.00 mm","尺寸": "100 mmx100 mm","标记": "2271","标高前缀": "BL","桥架类型": "CT","创建的阶段": "新构造","拆除的阶段": "无","水平对正": "中心","垂直对正": "中","宽度": "100 mm","高度": "100 mm","参照标高": "管线综合","偏移": "3400.00 mm","开始偏移": "3400.00 mm","端点偏移": "3400.00 mm","长度": "18507.78 mm"},{"图像": "<无>","底部高程": "3230.00 mm","顶部高程": "3330.00 mm","尺寸": "100 mmx100 mm","标记": "2272","创建的阶段": "新构造","拆除的阶段": "无","水平对正": "中心","垂直对正": "中","宽度": "100 mm","高度": "100 mm","参照标高": "管线综合","偏移": "3280.00 mm","开始偏移": "3280.00 mm","端点偏移": "3280.00 mm","长度": "1368.66 mm"},{"图像": "<无>","底部高程": 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"新构造","拆除的阶段": "无","水平对正": "中心","垂直对正": "中","宽度": "100 mm","高度": "100 mm","参照标高": "管线综合","偏移": "3400.00 mm","开始偏移": "3400.00 mm","端点偏移": "3400.00 mm","长度": "8384.77 mm"},{"图像": "<无>","底部高程": "3350.00 mm","顶部高程": "3450.00 mm","尺寸": "100 mmx100 mm","标记": "2282","标高前缀": "BL","桥架类型": "CT","创建的阶段": "新构造","拆除的阶段": "无","水平对正": "中心","垂直对正": "中","宽度": "100 mm","高度": "100 mm","参照标高": "管线综合","偏移": "3400.00 mm","开始偏移": "3400.00 mm","端点偏移": "3400.00 mm","长度": "18507.78 mm"},{"图像": "<无>","底部高程": "3230.00 mm","顶部高程": "3330.00 mm","尺寸": "100 mmx100 mm","标记": "2289","创建的阶段": "新构造","拆除的阶段": "无","水平对正": "中心","垂直对正": "中","宽度": "100 mm","高度": "100 mm","参照标高": "管线综合","偏移": "3280.00 mm","开始偏移": "3280.00 mm","端点偏移": "3280.00 mm","长度": "224.62 mm"},{"图像": "<无>","底部高程": "3350.00 mm","顶部高程": "3450.00 mm","尺寸": "100 mmx100 mm","标记": "2297","标高前缀": "BL","桥架类型": "CT","创建的阶段": "新构造","拆除的阶段": "无","水平对正": "中心","垂直对正": "中","宽度": "100 mm","高度": "100 mm","参照标高": "管线综合","偏移": "3400.00 mm","开始偏移": "3400.00 mm","端点偏移": "3400.00 mm","长度": "601.77 mm"},{"图像": "<无>","底部高程": "3350.00 mm","顶部高程": "3450.00 mm","尺寸": "100 mmx100 mm","标记": "2300","标高前缀": "BL","桥架类型": "CT","创建的阶段": "新构造","拆除的阶段": "无","水平对正": "中心","垂直对正": "中","宽度": "100 mm","高度": "100 mm","参照标高": "管线综合","偏移": "3400.00 mm","开始偏移": "3400.00 mm","端点偏移": "3400.00 mm","长度": "4852.49 mm"},{"图像": "<无>","底部高程": "3276.89 mm","顶部高程": "3403.11 mm","尺寸": "100 mmx100 mm","标记": "2301","创建的阶段": "新构造","拆除的阶段": "无","水平对正": "中心","垂直对正": "中","宽度": "100 mm","高度": "100 mm","参照标高": "管线综合","偏移": "3359.81 mm","开始偏移": "3359.81 mm","端点偏移": "3320.19 mm","长度": "79.23 mm"},{"图像": "<无>","底部高程": "3276.89 mm","顶部高程": "3403.11 mm","尺寸": "100 mmx100 mm","标记": "2302","创建的阶段": "新构造","拆除的阶段": "无","水平对正": "中心","垂直对正": "中","宽度": "100 mm","高度": "100 mm","参照标高": "管线综合","偏移": "3359.81 mm","开始偏移": "3359.81 mm","端点偏移": "3320.19 mm","长度": "79.23 mm"}]}
1. id[] : 构件 id 数组
JSON
{"scene": 0,"asset": {"generator": "gltf-samples-generator","version": "2.0"},"scenes": [{"name": "-1","nodes": [0]}],"nodes": [{"name": "-1","mesh": 0}],"meshes": [{"name": "-1","primitives": [{"attributes": {"POSITION": 0,"NORMAL": 1,"_BATCHID": 2},"indices": 3,"material": 0}]}],"materials": [{"name": "MaterialNode_8355711_0","pbrMetallicRoughness": {"roughnessFactor": 1.0,"baseColorFactor": [0.498039216,0.498039216,0.498039216,1.0],"metallicFactor": 0.0},"alphaMode": "OPAQUE","doubleSided": true}],"accessors": [{"min": [21.8017368,21.23,-39.46816],"max": [42.94478,21.45,-19.6449471],"bufferView": 0,"byteOffset": 0,"componentType": 5126,"count": 1104,"type": "VEC3"},{"min": [-1.0,-1.0,-1.0],"max": [1.0,1.0,1.0],"bufferView": 0,"byteOffset": 12,"componentType": 5126,"count": 1104,"type": "VEC3"},{"min": [0.0],"max": [22.0],"bufferView": 0,"byteOffset": 24,"componentType": 5126,"count": 1104,"type": "SCALAR"},{"min": [0],"max": [1103],"bufferView": 1,"byteOffset": 0,"componentType": 5123,"count": 1932,"type": "SCALAR"}],"bufferViews": [{"buffer": 0,"byteLength": 30912,"byteOffset": 0,"target": 34962,"byteStride": 28},{"buffer": 0,"byteLength": 3864,"byteOffset": 30912,"target": 34963}],"buffers": [{"byteLength": 34776}]}
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