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Range Profile Synthesis

Range Profile Synthesis. SAMPL Group Meeting 10 October 2000 By Gerald Dalley. Overview. Project Goal Ray Tracing Range Profiles and Range Images Lighting Models POV-Range. Project Goal. “Tanks Under Trees”. Ray Tracing -- 2D. Object Intersected. Screen. d s. x o. x s. . d o.

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Range Profile Synthesis

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  1. Range Profile Synthesis SAMPL Group Meeting 10 October 2000 By Gerald Dalley

  2. Overview • Project Goal • Ray Tracing • Range Profiles and Range Images • Lighting Models • POV-Range

  3. Project Goal • “Tanks Under Trees”

  4. Ray Tracing -- 2D

  5. Object Intersected Screen ds xo xs  do Ray Tracing -- Math in 2D

  6. Ray Tracing -- 3D

  7. Range Profiles -- Theory

  8. Range Profiles -- Current Implementation

  9. Range Images Range Intensity

  10. Typical Lighting Model • Ambient • Background light level • Diffuse • Matte surface • Specular • The window on the apple

  11. Bidirectional Radiance Distribution Functions (BRDFs) Surface Normal Plane of Incidence i i r Plane of reflection r Figure adapted from Advanced Animation and Rendering Techniques, pg. 34

  12. BRDFs Cont. • Physics-based lighting • Polarized light • Example: Wet pavement • i  r • i and r both small

  13. BRDF Simplifications • Intensity independent of: • i (no polarization on incoming light) • r (no polarization on outgoing light) • i=r (light source and camera at same point) • I(i, r, i, r)  I()

  14. POV-Range • What is it? • What platforms? • Performance? • 800x600: 20 min. / 72 frames • 8192x8192: 6.5 hrs. / 1 frame

  15. Demo • “POV-Range” • View range image in Matlab

  16. Further Information… • Foley, Van Dam, Feiner, Hughes. Computer Graphics: Principles and Practice • Watt, Watt. Advanced Animation and Rendering Techniques • www.povray.org • comp.graphics.rendering.raytracing

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