• 01 – Introduction
  • 02 – Bio
    • World Travel(ler)
  • 03 – Research
  • 04 – Special Projects
    • Own Work – Image Based Lighting (IBL) (Rendering)
    • Own Work – 1914 GNOME Monosoupape B2 engine
    • Own Work – 1914 Lewis Gun
  • Links
    • Autodesk’s Fusion 360
    • Combat Air Museum, Topeka, Kansas
    • Spheron VR AG, Germany
  • Glossary
    • 32-bit images
    • Aperture (and f-stops)
    • Equirectangular Projection
    • HDR
    • IBL
    • Immersive View – Example
    • rendering
    • Rendering / Computer Modelling
    • Scene Center
    • SceneCam system
    • SpheronVR SpheroViewer
    • STL
    • tone mapping

Professor Huw THOMAS

~ Special interests and activities I engage with…

Professor Huw THOMAS

Category Archives: Core Activity

Events which are CORE to my research, such as new contacts, related activities such as scanning or meetings etc.

Protected: H01 – Agreed to scan interior of asset

31 Monday Aug 2015

Posted by Huw Thomas in Core Activity, NFGRF, Timeline

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Contact, H01, NFGRF

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Protected: Meeting with C01

29 Wednesday Jul 2015

Posted by Huw Thomas in Core Activity, NFGRF, Timeline

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Tags

C01, commercial, NFGRF, photogrammetry, Research, SpheroCam, Spheron

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Photogrammetry example, HDR and Backplate Acquisition

23 Thursday Jul 2015

Posted by Huw Thomas in Core Activity, Timeline

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Tags

backplate, HDR, IBL, Measurement Cube, NFGRF

Generated HDR set (with backplates) for IBL / Image Based Lighting process walk through.

As a dual pair of images was taken, we can also use these as a photogrammetry pair.

Process involved:

  • White Balance marker placement
  • Spheron scans (two of)
  • Digital backplates (taken with full frame sensor Canon 5D) and measurement cube in situ
  • Post-Processing of raw Spheron (.SPH) files to crate Radiance files (.HDR) (using Spheron native Image Processing Engine)
  • White Balancing Backplates (using Adobe Photoshop)
  • Removing Lens Distortion (using Adobe Photoshop)
  • White Balancing Radiance / HDR file (using Adobe Photoshop)
  • Resizing down to 5K wide file (for initial render tests) (using Adobe Photoshop)

Assembled Measurement Cube

21 Tuesday Jul 2015

Posted by Huw Thomas in Core Activity, Timeline

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Tags

3D Printer, fabrication, HDR, IBL, Measurement Cube, NFGRF, rendering, Research

Key to both scaling and perspective matching, a ‘measurement cube’ is an essential component of the Image Based Lighting setup process.

Amazingly, they are very hard to find / purchase, so I decided to create my own.

In the past I have used a Gypsy 6 Motion Capture suit calibration cube  – which served the purpose, but also had following shortcomings:

  • Physical size was not ideal for IBL sets intended for larger asset renders
  • Color of cube made it had to see / work with
  • Bars very thin – making them hard to see.
  • It was part a system owned by my former employer in UK, so not available to me in USA.

_MG_6342_sq _MG_6370_WP _MG_6390_WP

Above : Measurement Cube ‘on location’ – Bentley Motors, Crewe, United Kingdom – Photos Huw Thomas


Budget Alternative – Cardboard Board

In absence of above, I have used cardboard boxes, although this again has its limitations:

  • Not square
  • Cannot see through it
  • Harder to establish ‘perspective’ viewpoint

_MG_1723_WPSq _MG_1726_WPSq _MG_1729_WPSq

Above : Cardboard box ‘measurement cube’

Resultant Images – Test Renders

THOMAS_H_Rendering_McLaren_McLaren_Keyshot_Test_McLaren_01_026.jpgTHOMAS_H_Rendering_McLaren_Keyshot_Test_McLaren_02_025.jpgMcLaren_Barker_Shot_01_R003_Tyre_Black_BOdy.jpg

Above : Renders using budget measurement cube | Rendered Huw Thomas (Keyshot)


My solution comprises:

  • 8 X 3D printed corners – using a MakerBot 3D printer
  • 12 X 2 foot PVC tubes (courtesy of The Home Depot)

Cube Measurements (in Millimetres, as working in Metric inside Maya)

  • Across Centers = 630 mm
  • Tube Diameter = 21 mm
  • Sphere Diameter = 50.8 mm

End result – a fairly lightweight, highly visible asset – total cost about $20

Image to be inserted

Protected: Heritage H01 Visit

15 Wednesday Jul 2015

Posted by Huw Thomas in Core Activity, Timeline

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H01, Historial, NFGRF, R01, Research

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Protected: Contact – Sponsor 01 (S01) – Update on research / visit to R02

04 Saturday Jul 2015

Posted by Huw Thomas in Core Activity, Timeline

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R02, S01

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Protected: Contact – Commercial 01 (C01), Kansas

30 Tuesday Jun 2015

Posted by Huw Thomas in Core Activity, Timeline

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Tags

aircraft, aviation, C01, commercial, Contact, NFGRF, photogrammetry

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Protected: Research (R02) – Field visit – Washington DC, USA

19 Friday Jun 2015

Posted by Huw Thomas in Core Activity

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R02

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Protected: R02 – Media

19 Friday Jun 2015

Posted by Huw Thomas in Core Activity

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Media, R02, Secondary Research

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Protected: Contact – Commercial 02 (C02) – Arizona, USA

18 Saturday Apr 2015

Posted by Huw Thomas in Core Activity

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aircraft, C02, commercial, Contact, HDR, rendering

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Categories

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  • Administration (2)
  • Allied Activity (12)
  • Core Activity (21)
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  • Timeline (29)
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Recent Posts

  • 1914 GNOME Monosoupape B2 engine
  • SpheronVR SceneCam and ScanLight : Combat Air Museum
  • Workflow : iSTAR data into PTGUi Pro
  • LSF Post : Spheron ScanLight
  • LSF Post : iSTAR vs Spheron : Comparison

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