building 3d content to last
DESCRIPTION
This slideshow is part of our guidance on 3D digitisation which you can find at http://www.jiscdigitalmedia.ac.uk/infokits/3D-digitisation/TRANSCRIPT
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Content• JISC Digital Media 3D work so far• Culture of data reuse/challenge of reusing 3D• 3D file formats• Significant properties of 3D• Metadata for 3D content• Work yet to be done/conclusions
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www.jiscdigitalmedia.ac.uk
• Support for JISC Advance HE/FE/GLAM
• Video, sounds, images & 3D
• Website: ‘good practice guides’
• Mailing list, blog and Twitter
• Helpdesk service
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JISC Digital Media 3D Toolkit
• An Introduction to 3D Digitisation
• IPR for 3D Digitisation (with JISC Legal)
• Sharing 3D Content
• Publishing 3D Content Online
• Seminars, workshops & case studies
• Examples of 3D in research...
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Augmented Realityin the veterinary science
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Motion capturein choreography & sports science
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Rapid prototypingin engineering
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Culture of data reuse
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Data reuse requirements(government, research and heritage)
• Data ‘availability’ mandate from RCUK (2013)
• Publishers (e.g. BMJ) data requirements
• data.gov and more ‘open data’ EU directives likely
• HLF ‘digital outputs’ available for 10 years, usable
for 5 years, post-award
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Some reuse expectations
Digital content should typically be:• In a suitable format to support reuse• Adequately described to support
reuse• Available/reusable for x years
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Culture of reuse:A 3D problem?
‘Standard’ digital content Digital 3D content
Long-lived file formats clear
Significant properties defined
Metadata standards in place
Long-lived file formats unclear
Significant properties undefined
Metadata standards not in place
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3-dimensional challenges
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File formats
“We are often inhibited... by the large numbers
of proprietary formats used to analyse, process
and visualise 3D data.”
- Jenny Mitcham, ADS 2012
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• Widespread adoption (proprietary often
beats open source)
• Minimal ‘dependencies’ (open often wins)
• Code in public realm (open or ‘semi-open’)
• As simple as possible
‘Standard’ file formatselection criteria
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3D file formats: the state of play• Over 166 different 3D file formats in common usage• All are complex (define Geometry, Appearance, Scene
properties, Animation)• Excluding proprietary/undisclosed formats many open
formats exist (e.g. Meshlab outputs: PLY, STL, OFF, OBJ, 3DS, VRML 2.0, U3D, X3D and Collada)
• Some even have ‘sub-formats’ (e.g. DAZ Collada & Autodesk Collada)
• All are different (e.g. Geometry stored as parametric surface, faceted mesh, pointcloud, boundary only or solid geometry)
www.turbosquid.com, a solution in practice:
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Common 3D file formats
• .dae (Collada) XML-based format is gaining ground
• .3ds and .obj most commonly used as exchange formats
• .obj is currently still 3D ‘workhorse’
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.obj still popular*
Data Description Preservation format (Archiving) Required?
Original raw scan file ASCII TXT and Native Yes
Pre-mesh point cloud ASCII TXT Strongly advised if archiving a derived Polygonal mesh
Polygonal Mesh OBJ + MTL (ASCII) Required if final dataset
Decimated Mesh OBJ + MTL (ASCII) Required if final dataset
*From ADS/AHDS laser scanning good practice guide
http://guides.archaeologydataservice.ac.uk/g2gp/LaserScan_3-1
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• Image and Spatial Data Analysis Group (ISDA)
Conversion Software Registry
– Repository of info on conversion software
– Complements ‘file format registries’ (e.g. PRONOM)
• ISDA’s own software tools for 3D conversion at
http://isda.ncsa.illinois.edu/drupal/
3D formats: useful tools
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Q. Format.x seems best, will it last?
A. No
All file formats will become obsolete and will need to be updated over time.
We must ensure 3D content continues to ‘perform’ in the same ways, independent of format.
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Significant Properties
• Updating/converting formats = information loss• Important to ensure files still ‘perform’ in the same
way as before• Files should convey the essence of a digital record• Files akin to a musical score (rather than a
gramophone record)
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Significant Properties
• Files ‘do’ lots of things, what do we really care about?
• Defined as significant properties• Ensure these are maintained,
regardless of current or future file type
• Documented as metadata...
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Metadata and 3D content
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Metadata• Actual data is the 3D model, metadata describes the
3D model
• Searchable, can be queried used for browsing (and
managing) digital content
• 3D-specific standards slowly emerging
• Back to www.turbosquid.com...
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Metadata@turbosquid
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MetadataMetadata for 3D Models (Boeykens, Bogani 2011)
suggest the following are also described:
• Are any materials used physically correct?
• Are advanced shaders/plug-ins used?
• Are layers or components present?
• Is lighting/physically correct lighting used?
• List any external files required
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MetadataThe POCUS* project suggests we also describe:• Audience and type of interaction expected (i.e. who is the
model aimed at and how can they interact with it?)• Methods and techniques used to create a model
(hardware model numbers, software versions etc.)• Datasets used to create a 3D model (e.g. laser scanning,
geophysics, lidar)• Flag when features of a model based on estimation
rather than evidence
*The preservation of complex objects (POCOS) Vol.1,
Visualisations and simulations, 2012
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Conclusions
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Work yet to be done
• Significant properties of 3D should be communally
defined (extend INSPECT work?) to save
duplication of effort
• A shared (if basic) 3D technical metadata standard
could be defined and adopted by repositories
• The shortage of 3D digitisation training with a public
sector focus should be addressed
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ConclusionThe sharing of 3D content is complex. It would
ideally be considered (and costed) before any
content is created.
Archiving is far easier when repositories (museums,
archives, universities or similar) work alongside the
creators of 3D content with preservation as the
common goal.- paraphrasing ADS