Journal
ACM TRANSACTIONS ON GRAPHICS
Volume 38, Issue 6, Pages -Publisher
ASSOC COMPUTING MACHINERY
DOI: 10.1145/3355089.3356525
Keywords
specular surface rendering; glints; material appearance; wave optics
Categories
Funding
- NSF [1703957, 1704540]
- Ronald L. Graham chair
- UC San Diego Center for Visual Computing
- Adobe Fellowship
- Div Of Information & Intelligent Systems
- Direct For Computer & Info Scie & Enginr [1704540] Funding Source: National Science Foundation
- Div Of Information & Intelligent Systems
- Direct For Computer & Info Scie & Enginr [1703957] Funding Source: National Science Foundation
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Rendering specular material appearance is a core problem of computer graphics. While smooth analytical material models are widely used, the high-frequency structure of real specular highlights requires considering discrete, finite microgeometry. Instead of explicit modeling and simulation of the surface microstructure (which was explored in previous work), we propose a novel direction: learning the high-frequency directional patterns from synthetic or measured examples, by training a generative adversarial network (GAN). A key challenge in applying GAN synthesis to spatially varying BRDFs is evaluating the reflectance for a single location and direction without the cost of evaluating the whole hemisphere. We resolve this using a novel method for partial evaluation of the generator network. We are also able to control large-scale spatial texture using a conditional GAN approach. The benefits of our approach include the ability to synthesize spatially large results without repetition, support for learning from measured data, and evaluation performance independent of the complexity of the dataset synthesis or measurement.
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