3D Tiles Tools

Overview

The 3D Tiles Tools are a collection of tools and utilities for converting, optimizing, processing, and analyzing 3D Tiles data.

Installation

To install the 3D Tiles Tools locally into a directory, run

npm install 3d-tiles-tools

If you want to work directly with a clone of the Git repository, see Developer Setup.

Command Line Usage

Common command line options for each function:

Command line tools for tilesets

gzip

Gzips the input tileset.

npx 3d-tiles-tools gzip -i ./specs/data/TilesetOfTilesets/ -o ./output/TilesetOfTilesets-gzipped/

Additional command line options:

^{(Note: The exact set of files that are covered with tilesOnly is not specified yet)}

ungzip

Ungzips the input tileset.

npx 3d-tiles-tools ungzip -i ./specs/data/TilesetOfTilesets-gzipped/ -o ./output/TilesetOfTilesets-ungzipped/

combine

Combines all external tilesets into a single tileset.

npx 3d-tiles-tools combine -i ./specs/data/combineTilesets/input -o ./specs/data/combineTilesets/output

merge

Merge multiple tilesets into a single one that refers to the input tilesets as external tilesets.

npx 3d-tiles-tools merge -i ./specs/data/mergeTilesets/TilesetA -i ./specs/data/mergeTilesets/sub/TilesetA -o ./specs/data/mergeTilesets/output

upgrade

Upgrade a tileset to the latest 3D Tiles version.

npx 3d-tiles-tools upgrade -i ./specs/data/TilesetOfTilesets/tileset.json -o ./output/upgraded

Additional command line options:

By default, this will upgrade legacy tilesets to comply to the 3D Tiles 1.0 specification.

These upgrades include:

• The asset version will be set to '1.0'.
• Tile content that uses a url will be upgraded to use uri.
• The refine value will be converted to be in all-uppercase.
• glTF 1.0 models in B3DM or I3DM will be upgraded to glTF 2.0.

Implementation note:

Internally, the conversion of glTF 1.0 assets into glTF 2.0 assets is performed by processing the GLB data with gltf-pipeline. This will include the attempt to convert materials that are given with the KHR_technique_webgl extension into PBR materials. Options that are given after the --options parameter are passed to gltf-pipeline. These options may include the names of uniform variables that should indicate whether a certain texture is used as the "base color" texture of a PRB material. For example, when a tileset contains B3DM or I3DM data that contains GLB with the KHR_technique_webgl extension where the uniform names u_diff_tex and u_diffuse indicate that a texture should be a base color texture, then the command line

npx 3d-tiles-tools upgrade -i ./input/tileset.json -o ./output/tileset.json --options --baseColorTextureNames u_diff_tex --baseColorTextureNames u_diffuse

can be used.

When --targetVersion 1.1 is given, then this will upgrade legacy tilesets to comply to the 3D Tiles 1.1 specification, including an attempt to convert PNTS, B3DM, and I3DM tile content into glTF assets. The upgrades then include:

• The asset version will be set to '1.1'.
• Tile content that uses a url will be upgraded to use uri.
• The refine value will be converted to be in all-uppercase.
• glTF 1.0 models in B3DM or I3DM will be upgraded to glTF 2.0.
• The 3DTILES_content_gltf extension declaration will be removed.
• PNTS, B3DM, and I3DM content will be converted to glTF.

Implementation note:

The conversion of the legacy tile formats to glTF should be considered as a preview feature. There are corner cases where the conversion is not possible generically - for example, when I3DM tile content contains glTF data that contains animations. The conditions under which the conversion is possible may be specified more explicitly in the future.

convert

^{(This replaces the databaseToTileset and tilesetToDatabase commands)}

Convert between tilesets and tileset package formats.

npx 3d-tiles-tools convert -i ./specs/data/TilesetOfTilesets/tileset.json -o ./output/TilesetOfTilesets.3tz

Additional command line options:

The input- and output arguments for this command may be

• The name of a directory that contains a tileset.json file (or the full path to a tileset JSON file)
• The name of a .3tz file
• The name of a .3dtiles file

The input may also be a .zip file that contains a tileset.json file.

When the input is a .zip file or a directory that contains multiple tileset JSON files, and none of them is called tileset.json, then the --inputTilesetJsonFileName argument can be used to define the JSON file that should be considered to be the top-level tileset JSON. For example, when there is an ambiguous.zip tile that does contain two JSON files called tilesetA.json and tilesetB.json, the following command can be used to designate tilesetA.json as the top-level tileset JSON file:

npx 3d-tiles-tools convert -i ./specs/data/convert/ambiguous.zip -o ./output/ambiguous.3tz --inputTilesetJsonFileName tilesetA.json

databaseToTileset

Deprecated. This functionality is now offered via the convert command.

tilesetToDatabase

Deprecated. This functionality is now offered via the convert command.

Command line tools for tile content

glbToB3dm

Creates a b3dm from a glb with an empty batch table.

npx 3d-tiles-tools glbToB3dm -i ./specs/data/CesiumTexturedBox/CesiumTexturedBox.glb -o ./output/CesiumTexturedBox.b3dm

glbToI3dm

Creates a i3dm from a glb with a single instance at position [0, 0, 0] and an empty batch table.

npx 3d-tiles-tools glbToI3dm -i ./specs/data/CesiumTexturedBox/CesiumTexturedBox.glb -o ./output/CesiumTexturedBox.i3dm

b3dmToGlb

Extracts the glb from a b3dm.

npx 3d-tiles-tools b3dmToGlb -i ./specs/data/batchedWithBatchTableBinary.b3dm -o ./output/extracted.glb

i3dmToGlb

Extracts the glb from a i3dm.

npx 3d-tiles-tools i3dmToGlb -i ./specs/data/instancedWithBatchTableBinary.i3dm -o ./output/extracted.glb

cmptToGlb

Extracts the glb models from a cmpt tile. If multiple models are found a number will be appended to the output file name.

npx 3d-tiles-tools cmptToGlb -i ./specs/data/composite.cmpt -o ./output/extracted.glb

convertB3dmToGlb

Convert a b3dm file into a glTF asset that uses glTF extensions to represent the batch- and feature table information.

npx 3d-tiles-tools convertB3dmToGlb -i ./data/example.b3dm -o ./data/example.glb

convertPntsToGlb

Convert a pnts file into a glTF asset that uses glTF extensions to represent the point properties and batch- and feature table information.

npx 3d-tiles-tools convertPntsToGlb -i ./data/example.pnts -o ./data/example.glb

convertI3dmToGlb

Convert an i3dm file into a glTF asset that uses glTF extensions to represent the batch- and feature table information. This conversion may be lossy if the GLB of the input i3dm contains animations.

npx 3d-tiles-tools convertI3dmToGlb -i ./data/example.i3dm -o ./data/example.glb

optimizeB3dm

Optimize a b3dm using gltf-pipeline.

npx 3d-tiles-tools optimizeB3dm -i ./specs/data/batchedWithBatchTableBinary.b3dm -o ./output/optimized.b3dm

Additional command line options:

Examples:

To use Draco compression, pass the draco flags

npx 3d-tiles-tools optimizeB3dm -i ./specs/data/Textured/batchedTextured.b3dm -o ./output/optimized.b3dm --options --draco.compressMeshes --draco.compressionLevel=9

This example optimizes the b3dm and compresses the meshes using Draco, with a high compression level.

optimizeI3dm

Optimize a i3dm using gltf-pipeline.

npx 3d-tiles-tools optimizeI3dm -i ./specs/data/instancedWithBatchTableBinary.i3dm -o ./output/optimized.i3dm

See optimizeB3dm for further examples.

analyze

Analyze the input file, and write the results to the output directory.

npx 3d-tiles-tools analyze -i ./specs/data/batchedWithBatchTableBinary.b3dm -o ./output/analyzed/

This will accept B3DM, I3DM, PNTS, CMPT, and GLB files (both for glTF 1.0 and for glTF 2.0), and write files into the output directory that contain the feature table, batch table, layout information, the GLB, and the JSON of the GLB. This is primarily intended for debugging and analyzing tile data. Therefore, the exact naming and content of the generated output files are not specified.

Pipeline

Execute a sequence of operations that are described in a JSON file.

Note: The pipeline execution feature is preliminary. Many aspects of the pipeline definition, including the JSON representation and the exact set of operations that are supported as parts of pipelines may change in future releases.

The basic structure of a pipeline JSON file is summarized here:

• A pipeline has an input and output, which are the names of a tileset directory or package
• A pipeline has an array of 'tileset stages'
• A tileset stage has a name and a description
• A tileset stage can carry information about the content types that it is applied to
• A tileset stage has an array of 'content stages'
• A content stage has a name and a description

A simple example pipline may therefore look like this:

{
  "input": "./specs/data/TilesetOfTilesetsWithUris",
  "output": "./output/TilesetOfTilesetsWithUris.3tz",
  "tilesetStages": [
    {
      "name": "_b3dmToGlb",
      "description": "Convert B3DM to GLB",
      "contentStages": [
        {
          "name": "b3dmToGlb",
          "description": "Convert each B3DM content into GLB"
        }
      ]
    }
  ]
}

The name of a tileset- or content stage can refer to a predefined set of operations that can be executed. If a name is not one of the known operations, it should start with an _ underscore.

The description of a tileset- or content stage is intended as a human-readable summary, to be shown as log output.

The predefined operations largely correspond to the command-line functionality.

The known tileset stages are:

• Modification:
  • upgrade: Upgrade the input tileset to the latest version. Details about what that means are omitted here.
  • combine: Combine all external tilesets of the input tileset, to create a single tileset
• Compression:
  • gzip: Apply GZIP compression to all files (with optional filters)
  • ungzip: Uncompress all files that are compressed with GZIP

The known content stages are:

• Conversion:

  • glbToB3dm: Convert all GLB tile contents into B3DM
  • glbToI3dm: Convert all GLB tile contents into I3DM (with the GLB being the only instance)
  • b3dmToGlb: Convert all B3DM tile contents into GLB (assuming that the B3DM is only a wrapper around GLB)
  • i3dmToGlb: Convert all I3DM tile contents into GLB (assuming that the I3DM is only a wrapper around GLB)
  • separateGltf: Convert all GLB tile contents into .gltf files with external resources

• Optimization:

  These operations receive an options object, which is an untyped object carrying the options that are passed to gltf-pipeline for the optimization.

  • optimizeGlb: Optimize GLB tile content, using gltf-pipeline
  • optimizeB3dm: Optimize the GLB payload of a B3DM tile content, using gltf-pipeline
  • optimizeI3dm: Optimize the GLB payload of a I3DM tile content, using gltf-pipeline

An example of a pipeline that combines a sequence of multiple operations is shown in examplePipeline.json.

Developer Setup

When the tools are not installed as a package from NPM, but supposed to be used directly in a cloned repository, then the command line usage is as follows:

• Clone the repository into the current directory:

  git clone https://github.com/CesiumGS/3d-tiles-tools
  

• Change into the directory of the cloned repository:

  cd 3d-tiles-tools
  

• Install the tools and all dependencies:

  npm install
  

After this, ts-node can be used to directly execute the tools, using the same command line options as described above - for example:

npx ts-node src/main.ts gzip -i ./specs/data/TilesetOfTilesets/ -o ./output/TilesetOfTilesets-gzipped/

See the implementation notes for details about the project structure.