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precipitate, and displayed those in a few seconds in which the scene progressively
and visibly ages. Open for further investigation is the simulation on large scenes.
For now, our approach is limited to a few objects chosen by the content artist as a
region of interest, since the memory consumption limits the material atlas size and
thus the visual quality. A number of extensions to our approach are imaginable.
If more memory was available, e.g., by compression, it would be possible to add
multiple layers of material, not only one as we do now. Related to this is the
gradual peeling of layers [Paquette et al. 02], possibly initiating a more distinctive
deformation of the surface, which could go beyond the capabilities of a single-
pass tessellation shader. Another direction to look into is the implementation of
a more detailed temporal aging behavior, since many materials are subject to a
nonlinear aging process [Gu et al. 06]. On the GPU, discrete time steps could be
easily encoded in a 3D texture, whereas the third dimension is time.
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