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Real-time Rendering Sub-Surface Scattering

Real-time Rendering Sub-Surface Scattering. CSE 781 Prof. Roger Crawfis. Subsurface Scattering: Translucency. Light enters and leaves at different locations on the surface bounces around (scatters) inside. Subsurface Scattering: Marble. Milk vs. Paint. Skin. Skin.

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Real-time Rendering Sub-Surface Scattering

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  1. Real-time RenderingSub-Surface Scattering CSE 781 Prof. Roger Crawfis

  2. Subsurface Scattering: Translucency • Light enters and leaves at different locations on the surface • bounces around (scatters) inside

  3. Subsurface Scattering: Marble

  4. Milk vs. Paint

  5. Skin

  6. Skin

  7. Real-time RenderingImage-based Rendering CSE 781 Prof. Roger Crawfis

  8. The traditional pipeline A possible IBR pipeline The graphics pipeline modeling animation rendering 3Dscanning motioncapture image-based rendering

  9. Image caching[Shade et al., SIGGRAPH 1996] • PrecomputeBSP tree of scene (2D in this case) • Draw nearby nodes (yellow) as geometry • Render distant nodes (red) to RGB images (black) • Composite images together • As observer moves • if disparity exceeds a threshold, re-render image

  10. Apple QuickTime VR[Chen, Siggraph ’95] • Outward-looking • Panoramic views taken at regularly spaced points • Inward-looking • Views taken at points on the surface of a sphere

  11. The Plenoptic Function Radiance as a function of position and directionin a static scene with fixed illumination • For general scenes Þ 5D function L ( x, y, z, q, f)

  12. More parameterizations Chords of a sphere L ( 1, f1, q2, f2 ) • convenient for spherical gantry • facilitates uniform sampling

  13. IBR Modellingand Rendering • Store and access only pixels • No geometry, no light simulation, ... • Input: set of images • Output: image from new viewpoint • Large set of possible new viewpoints • Interpolation allows translation, not just rotation • Lightfield, lumigraph: translate outside convex hull of object • QuickTimeVR: camera rotates, no translation • Can point camera in or out

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