Stereological Techniquesfor Solid Textures

Rob Jagnow

MIT

Julie Dorsey

Yale University

Holly Rushmeier

Yale University

Given a 2D slice through an aggregate material, create a 3D volume with a comparable appearance.

ObjectiveObjective

Real-World MaterialsReal-World Materials

• Concrete

• Asphalt

• Terrazzo

• Igneous

minerals

• Porous

materials

Independently Recover…Independently Recover…

• Particle distribution

• Color

• Residual noise

Recovering ColorRecovering Color

Select mean particle colors fromsegmented regions in the input image

Input Mean ColorsSyntheticVolume

Recovering NoiseRecovering NoiseHow can we replicate the noisy appearance of the input?

- =

Input Mean Colors Residual

The noise residual is less structured and responds well to

Heeger & Bergen’s method

Synthesized Residual

without noise

Putting it all togetherPutting it all together

Input

Synthetic volumewith noise

Prior Work – RevisitedPrior Work – Revisited

Input Heeger & Bergen ’95 Our result

Results – Physical DataResults – Physical Data

PhysicalModel

Heeger &Bergen ’95

Our Method

ResultsResultsInput Result

ResultsResults

Input Result

An Approximate Global Illumination System for Computer Generated Films

Eric TabellionPDI / DreamWorks

Arnauld LamorlettePDI / DreamWorks

IntroductionIntroduction(a) Direct and indirect lighting (b) Direct lighting only

Example of a character in outside lighting conditions.(a) and (b) were rendered respectively with and without indirect lighting.

Ray Tracing Simplified GeometryRay Tracing Simplified Geometry

Simplified Geometry Micro-polygons Effective Ray Origin

To ray trace simplified geometry, we adjust the ray origin.

Ray Tracing Simplified GeometryRay Tracing Simplified Geometry

(a) (b) (c)

(a) 2 million displaced micro-polygons, without using the ray offsetting algorithm.

(b) using the ray offsetting algorithm, ray tracing only 4 thousand polygons, shown in (c).

Art DirectionArt Direction

(a) using a single bounce of indirect light

(b) using multiple bounces of indirect light

Art DirectionArt Direction

(a) reference (b) saturated (c) warm (d) directional

Art DirectionArt Direction

Triple Product Wavelet Integrals for All-Frequency Relighting

Ren NgStanford University

Pat HanrahanStanford University

Ravi RamamoorthiColumbia University

VideoVideo

Simulating Water and Smoke with anOctree Data Stucture

Frank LosassoStanford University

Industrial Light + Magic

Ron FedkiwStanford University

Industrial Light + Magic

FredericStanford University

VideoVideo

A Method for Animating Viscoelastic Fluids

Tolga G. Goktekin James F. O’BrienAdam W. Bargteil

University of California, Berkeley

VideoVideo