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Shadow Mapping

Shadow Mapping. Karthik Nallapeta Subramanya Izaaz Yunus Hasi Ebrahim Mehul Mittal Sourav Dey. What is a Shadow?. Light Source. Look At Position Field of View World Up Color No intensity fall off. Z. Options Considered. OpenGL (FLTK) + Ray Tracing Texturing. Core Algorithm.

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Shadow Mapping

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  1. Shadow Mapping KarthikNallapetaSubramanya IzaazYunusHasiEbrahim Mehul Mittal SouravDey

  2. What is a Shadow?

  3. Light Source • Look At • Position • Field of View • World Up • Color • No intensity fall off

  4. Z Options Considered • OpenGL (FLTK) + Ray Tracing • Texturing

  5. Core Algorithm • Populate Shadow Buffers. • Use shadow buffers forshading calculations during rendering.

  6. Changes to GzRenderer Old Code New Code while(!EOF) { populateShadowBuf() } while(!EOF) { putTriangle() } while(!EOF) { putTriangle() }

  7. Spaces: Existing

  8. Spaces: Step 1

  9. Spaces: Step 2 ?

  10. Spaces: Step 2

  11. Efficiency • Each light takes processing time as much as the rendering process • Lesser the lights, faster the speed but lower the shadow quality • Shadow resolution is directly proportional to speed of rendering

  12. References • Lance Williams 1976. Casting Curved Shadows on Curved Surfaces. http://artis.imag.fr/Members/Cyril.Soler/DEA/Ombres/Papers/William.Sig78.pdf • Cass Everitt, AshuRege, CemCebenoyan. Hardware Shadow Mapping. http://www.cs.berkeley.edu/~ravir/6160/papers/shadow_mapping.pdf • Randima Fernando. Percentage-Closer Soft Shadows. http://developer.download.nvidia.com/shaderlibrary/docs/shadow_PCSS.pdf • Cascaded Shadow Maps 2008, NVidia 2008 • http://en.wikipedia.org/wiki/Shadow_mapping

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