Sub-Surface Scattering Real-time Rendering Sub-Surface Scattering CSE 781 Prof. Roger Crawfis.

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Presentation transcript:

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

Image-based Rendering Real-time Rendering Image-based Rendering CSE 781 Prof. Roger Crawfis

modelinganimationrendering 3D scanning motion capture image-based rendering The graphics pipeline The traditional pipeline A possible IBR pipeline

Image caching [Shade et al., SIGGRAPH 1996] Precompute BSP 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

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

The Plenoptic Function Radiance as a function of position and direction in a static scene with fixed illumination For general scenes  5D function L ( x, y, z,  )

More parameterizations Chords of a sphere L (    ,     ) convenient for spherical gantry facilitates uniform sampling

IBR Modelling and 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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