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LightSketch & Scythe and Sew

LightSketch & Scythe and Sew. tools for rapid architectural lighting analysis. Daniel Glaser 1 , Osbert Feng 2 , Jan Voung 2 , Ling Xiao 2 , John Canny 2 , Ellen Yi-Luen Do 3.

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LightSketch & Scythe and Sew

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  1. LightSketch &Scythe and Sew tools for rapid architectural lighting analysis Daniel Glaser1, Osbert Feng2, Jan Voung2, Ling Xiao2, John Canny2, Ellen Yi-Luen Do3 1Interdisciplinary Doctoral Program, University of California, Berkeley2Computer Science Division, University of California, Berkeley 3Department of Architecture, University of Washington, Seattle 2003 Radiance Workshop, Berkeley, CA, Sep 22-26

  2. Introduction • There are few exploratory design tools for lighting simulation • Physical models have limited utility for daylight and electric light simulation • CAAD tools can be robust, but cumbersome • We propose: • sketching as interface to robust simulation environment • Workbench to manipulate simulation results

  3. LightSketch creates 3D Radiance models 2D sketchpad

  4. Symbols walls/window skylights fluorescent sconce/down light desk, chair

  5. Recognition • Spaces are currently recognized by their convex hull and interior/exterior relations

  6. Simulation Parameters • Quality • low/med/high • Sky • idealized, measured • Times • Location • Surfaces/windows • Global for model • Output • images • illuminance

  7. Architecture (Scythe and Sew, winimage)

  8. Scythe and Sew Workspace Area • manages a variety of patterns • constant • illuminance • luminance (grayscale) Composition Area: • algebraic resources • add • average • ratio

  9. Patterns as Unit of Analysis j f m a m j j 9am 12N 3pm Time in Space Space in Time

  10. Coloring Patterns • Color expresses magnitude • Different palettes for different uses • Retain access to numerical data

  11. Pattern Operators Patterns can be algebraically manipulated Pattern 1 Pattern 2 Pattern 3 - = • Intra-Pattern operators • max • average • min • ratio max( ) =

  12. Example 1: Illuminance Requirement 500 lux requirement note: low quality, standard CIE model (lux)

  13. Example 1: … … met near window, but potential glare problems

  14. 447 lux (lux) Example 2: Intra-ops Intra-Average (2x) … can quickly summarize the data

  15. Example 3: Reverse Pattern Time in Space(average) Space in Time (lux) … can provide insight into data

  16. Example 4: Comparing Sky Performance pattern 1 pattern 2 more light in afternoon more light in summer LightSketch model square model W window S window NE skylight

  17. Example 4: … - avg avg ( ) = avg = complex distribution(positive values when clear > cloudy) clear > cloudy in winter/pm similar when fully aggregated! =

  18. Example 5: Luminance Data for Desk Adding a desk: reduces light everywhere in room except for work surface (from this viewpoint) - =

  19. Conclusion LightSketch allows for quick sketching of simple lighting models (daylight and electric) LightSketch provides links to robust simulation environment Scythe and Sew provides a graphical workspace for managing complex data Keeps data in visual form for manipulation Operations allow for both inter and intra-pattern analysis

  20. Future Work • Increase lighting vocabulary • More complex geometry • Improved sky models • Additional operators • Visualization refinements

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