Stereological Techniques for Solid Textures Rob Jagnow MIT Julie Dorsey Yale University Holly Rushmeier Yale University.

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Presentation transcript:

Stereological Techniques for 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. Objective

Real-World Materials Concrete Asphalt Terrazzo Igneous minerals Porous materials

Independently Recover… Particle distribution Color Residual noise

Recovering Color Select mean particle colors from segmented regions in the input image Input Mean Colors Synthetic Volume

Recovering Noise How 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 together Input Synthetic volume with noise

Prior Work – Revisited InputHeeger & Bergen ’95Our result

Results – Physical Data Physical Model Heeger & Bergen ’95 Our Method

Results Input Result

Results InputResult

An Approximate Global Illumination System for Computer Generated Films Eric Tabellion PDI / DreamWorks Arnauld Lamorlette PDI / DreamWorks

Introduction (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 Geometry Simplified GeometryMicro-polygonsEffective Ray Origin To ray trace simplified geometry, we adjust the ray origin.

Ray 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 Direction (a) using a single bounce of indirect light (b) using multiple bounces of indirect light

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

Art Direction

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