Abstract
We present an efficient and scalable pipeline for fabricating full-colored objects with spatially-varying translucency from practical and accessible input data via multi-material 3D printing. Observing that the costs associated with BSSRDF measurement and processing are high, the range of 3D printable BSSRDFs are severely limited, and that the human visual system relies only on simple high-level cues to perceive translucency, we propose a method based on reproducing perceptual translucency cues. The input to our pipeline is an RGBA signal defined on the surface of an object, making our approach accessible and practical for designers. We propose a framework for extending standard color management and profiling to combined color and translucency management using a gamut correspondence strategy we callopaque relative processing.We present an efficient streaming method to compute voxel-level material arrangements, achieving both realistic reproduction of measured translucent materials and artistic effects involving multiple fully or partially transparent geometries.
Highlights
We present an efficient and scalable pipeline for fabricating fullcolored objects with spatially-varying translucency from practical and accessible input data via multi-material 3D printing
Observing that the costs associated with Bidirectional Surface Scattering Reflectance Distribution Function (BSSRDF) measurement and processing are high, the range of 3D printable BSSRDFs are severely limited, and that the human visual system relies only on simple high-level cues to perceive translucency, we propose a method based on reproducing perceptual translucency cues
We propose a framework for extending standard color management and profiling to combined color and translucency management using a gamut correspondence strategy we call opaque relative processing
Summary
We present an efficient and scalable pipeline for fabricating fullcolored objects with spatially-varying translucency from practical and accessible input data via multi-material 3D printing. Other fabrication technologies that allow full-color include hydrographics [Panozzo et al 2015], which allows application of an albedo texture to a 3D object, which may be created by 3D printing, via water transfer printing, and computational thermoforming [Schüller et al 2016], which uses a similar process, but with a plastic sheet instead of water, to create thin shells of full-color objects It is not clear how these techniques could be extended to control translucency. 2.2 Fabrication of translucency and scattering Techniques for both additive and subtractive manufacturing have been proposed [Dong et al 2010; Hašan et al 2010] using the scattering profiles approach designed for editing [Song et al 2009] These techniqes make use of the Kubelka-Munk layered scattering model [Kubelka and Munk 1931], which considers vertical (forward and back) scattering between layers of different materials (relative to the surface). While we have implemented our algorithm using CPU multi-threading, each step is parallel and could be further accelerated by a GPU implementation
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