Universitat de Girona Visualització, Realitat Virtual i Interacció Gráfica Girona Graphics Group

Example-Based Fractured Appearance


A common weathering effect is the appearance of cracks due to material fractures. Previous exemplar-based aging and weathering methods have either reused images or sought to replicate observed patterns exactly. We introduce a new approach to exemplar-based modeling that creates weathered patterns on synthetic objects by matching the statistics of fracture patterns in a photograph. We present a user study to determine which statistics are correlated to visual similarity and how they are perceived by the user. We then describe a revised physically-based fracture model capable of producing a wide range of crack patterns at interactive rates. We demonstrate how a Bayesian optimization method can determine the parameters of this model so it can produce a pattern with the same key statistics as an exemplar. Finally, we present results using our approach and various exemplars to produce a variety of fracture effects in synthetic renderings of complex environments. The speed of the fracture simulation allows interactive previews of the fractured results and its application on large scale environments.


    author = {Loeiz Glondu, Lien Muguercia, Maud Marchal, Carles Bosch, Holly Rushmeier, G. Dumont and G. Drettakis},
    title = {Example-Based Fractured Appearance},
    journal = {Computer Graphics Forum},
    volume = {31},
    number = {4},
    year = {2012},
    pages = {1547-1556},
    doi = {10.1111/j.1467-8659.2012.03151.x},
    url = {http://diglib.eg.org/EG/CGF/volume31/issue4/v31i4pp1547-1556.pdf},
    address = {Paris, France},


This paper was published at the Computer Graphcis Forum journal, and presented at 23rd Eurographics Symposium on Rendering, June 27th - 29th 2012, Paris, France.

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