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abstract
The artistic process of developing models with complex
appearances requires the support of intuitive, interactive tools.
While spatially varying bidirectional reflection distribution
functions (SBRDFs) provide control over appearances
that vary across a model's surface, current techniques for their creation
are largely limited to measuring and representing real-world materials.
In contrast, we present an intuitive, brush-based visual interface
that allows a user to design materials with only sparse input by painting
desired light and dark regions onto objects from arbitrary viewpoints.
This input guides the evolution of an optimized SBRDF
that is consistent with these constraints, while maintaining
physical plausibility for unspecified points and viewing directions.
The keys to interactivity are a novel GPU-based real-time importance
sampling algorithm and a fast neuroevolution-driven optimization
scheme explicitly designed for this problem domain.
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