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3D Revision Control FrameworkJozef Doboš & Anthony Steed

Department of Computer ScienceUniversity College London

August 5, 2012

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Introduction

3D models grow in complexity

Artists and engineers collaborate asynchronously

File systems poseserious drawbacks

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Contributions

How to maintain distributed open repository for revising 3D models

How scene graph of 3D assets can be stored in NoSQL DB (MongoDB)

How to extend the DB to store revision history Tier 1: A stand-alone GUI with conflict detection and

resolution Tier 2: A secondary read-only GUI via WebGL and Java

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Previous Work

Asset management and version control High-end CAD modeling packages:

Bentley Assetvise Dassault Catia

Software engineering: SVN, Git, Perforce... 3ds Max, Blender... + filesystems Locking

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Previous Work

Edit logging Nonlinear Revision Control for Images [Chen et al. 2011] MeshFlow: Interactive Visualization of Mesh Construction Sequences

[Denning et al. 2011] VisTrails Provenance Explorer for Maya

Network distribution XML3D – Interactive 3D Graphics for the Web [Sons et al. 2010] A scalable architecture for the HTML5/X3D integration model X3DOM [Behr

et al. 2010] SceneJS

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Aim

Support non-linear concurrent modeling Become agnostic to any specific modeling software Make one DB store the scene and its revision history

Hence separate modeling from its long-term storage

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Framework Overview

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Framework Overview

3rd party modeling software saves 3D scene locally

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Framework Overview

Tier 1 GUI imports/exports various 3D file formats Visualizes revisions and differences Saves scene components in remote 3D repository

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Framework Overview

Domain specific database Tracks revision history on individual scene nodes Supports sub-scene retrieval

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Framework Overview

Tier 2 GUI (subset of Tier 1 functionality) Inspects repository, retrieves and visualizes revisions Does not modify the models nor their history

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Framework Features

1. Support for wide range of assets2. Delta changes stored alongside non-linear history3. Easy access control and sub-object retrieval4. Interactive 3D diff tool5. Web interface for repository inspection

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3D Repository (DB)

Scene Graph (SG) Directed Acyclic Graph SG Node: scene

component (binary blob) Metadata = (ID, R#) Used by:

[Zeleznik et al. 2000] [Berthelot et al. 2011]

Revision History (RH)

Directed Acyclic Graph RH Node: revision

Used by: Git, SVN, Mercurial, ... [Chen et al. 2011]

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Revision History

Rev 0

Branch

Trunk

Rev 8

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Revision Management

Revision Retrieval Return all the newest SG nodes for a given revision number

Revision Commit Delta changes as new revisions Potential conflicts → need conflict resolution

Node deletion Store NULL in the next revision Recursively check children

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3D Diff and Merge

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3D Diff and Merge

Find corresponding nodes in A, B based on ID Binary compare for differences

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3D Diff and Merge

Identical nodes → no modification

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3D Diff and Merge

Discrepancies in nodes → conflict Select A or B or export into 3rd party editor

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3D Diff and Merge

Given AncestorAB more states can be detected

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3D Diff and Merge

Identical nodes → no modification (as before)

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3D Diff and Merge

Some conflicts can now be automatically resolved

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Prototype Implementation

MongoDB NoSQL (schemaless) Geospatial indexing Data as Binary JSON (BSON) – little-endian serialized

C types UUID as node identifiers Two collections (one for each DAG – SG and RH)

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DAG as Flat Collection

is a parent-child relationship V is a logical disjunction

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Tier 1 - 3D Revision Control Viewer

Written in C++ and Qt Open Asset Import Library (Assimp) to handle models Converts unified scene graph into collection of BSON Handles all version control logic Performs visual 3D diff Exports to common file formats

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Tier 1 - 3D Revision Control Viewer

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3D Diff Tool

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Tier 2 - 3D Web Client

Driven by JavaScript MongoDB Java driver loads BSON from DB WebGL renderer displays in web browsers

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Tier 2 - 3D Web Client

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Discussion

Interaction via import/export of 3D files Files now considered only temporary representation Smallest unit of change is SG node (BSON document) Each SG node can be 16MB max (automated multiple

documents workaround) Assume the 3D file to preserve metadata Lack of data validation on insertion

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Future Work

Android and Java Webstart Tier 2 viewers Store other types of data Locking and hybrid locks with geometric constrains Search via spatial queries Integrate into existing industrial pipelines

Open crowd-sourcing of 3D models

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Future Work

Possible direct connection from editing software Hides the revision control layer from the user

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Conclusions

Novel approach to storage and revision control of 3D assets

Represented hierarchical scene graphs in DB Preserved associated revision history Successfully decoupled modeling from long term

storage

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Sponsors

Arup Foresight http://driversofchange.com

UK Engineering and Physical Sciences Research Council http://www.epsrc.ac.uk

UCL Engineering Doctorate Centre in Virtual Environments, Imaging & Visualisation http://engdveiv.cs.ucl.ac.uk

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http://3DRepo.org

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Talk Invitation

3D Diff: An Interactive Approach to Mesh Differencing and Conflict Resolution Session: Model Stories Date: Tuesday, 7 August Time: 2:00PM – 3:30PM Location: Room 406AB

http://3drepo.org

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Google Chrome

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Materials

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King’s Cross