Interactive albedo editing in path-traced volumetric materials

Hašan, Milovš; Ramamoorthi, Ravi

doi:10.1145/2451236.2451237

Cited by 28 publications

(16 citation statements)

References 30 publications

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“…Song et al [2009; overcome this by factorizing BSSRDF pro les into individual constituent materials and (layer) geometries. Hašan and Ramamoorthi [2013] even consider generalized volumetric structures, decomposing the edited object into voxels and employing a database of albedo-space derivatives in respect to each voxel to rapidly modify the resulting appearance.…”

Section: Materials Editingmentioning

confidence: 99%

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Scattering-aware texture reproduction for 3D printing

Elek

Sumin

Zhang³

et al. 2017

ACM Trans. Graph.

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Fig. 1. A still life photograph of our optimized printouts. The thickness of all the pictured samples is 1 cm.Color texture reproduction in 3D printing commonly ignores volumetric light transport (cross-talk) between surface points on a 3D print. Such light di usion leads to signi cant blur of details and color bleeding, and is particularly severe for highly translucent resin-based print materials. Given their widely varying scattering properties, this cross-talk between surface points strongly depends on the internal structure of the volume surrounding each surface point. Existing scattering-aware methods use simpli ed models for light di usion, and often accept the visual blur as an immutable property of the print medium. In contrast, our work counteracts heterogeneous scattering to obtain the impression of a crisp albedo texture on top of the 3D print, by optimizing for a fully volumetric material distribution that preserves the target appearance. Our method employs an e cient numerical optimizer on top of a general Monte-Carlo simulation of heterogeneous scattering, supported by a practical calibration procedure to obtain scattering parameters from a given set of printer materials. Despite the inherent translucency of the medium, we reproduce detailed surface textures on 3D prints. We evaluate our system using a commercial, ve-tone 3D print process and compare against the printer's native color texturing mode, demonstrating *Oskar Elek and Denis Sumin share the rst authorship of this work. Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for pro t or commercial advantage and that copies bear this notice and the full citation on the rst page. Copyrights for components of this work owned by others than ACM must be honored. Abstracting with credit is permitted. To copy otherwise, or republish, to post on servers or to redistribute to lists, requires prior speci c permission and/or a fee. Request permissions from permissions@acm.org. © 2017 ACM. 0730-0301/2017/11-ART241 $15.00 DOI: 10.1145/3130800.3130890 that our method preserves high-frequency features well without having to compromise on color gamut.

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Section: Materials Editingmentioning

confidence: 99%

“…In general however, these techniques di er from ours: they aim at obtaining interactive but approximate responses to edits, be it directly in the material parameter space [Song et al 2009;Wang et al 2008;Xu et al 2007] or inversely by posing constraints on the appearance [Hašan and Ramamoorthi 2013].…”

Section: Materials Editingmentioning

confidence: 99%

Scattering-aware texture reproduction for 3D printing

Elek

Sumin

Zhang³

et al. 2017

ACM Trans. Graph.

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“…Inverse rendering techniques solve for material optical parameters given desired object appearance. Some of them (e.g., [Gkioulekas et al 2013;Hašan and Ramamoorthi 2013;Khungurn et al 2015]) are also based on optimizations. However, these methods effectively solve a special case of our problem.…”

Section: ])mentioning

confidence: 99%

Downsampling scattering parameters for rendering anisotropic media

Zhao

Durand

et al. 2016

ACM Trans. Graph.

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Reference GB Ours MBRelative error: 0% 100% Figure 1: We present a new approach to compute scattering parameters at reduced resolutions. Many detailed appearance models involve high-resolution volumetric representations (top-left). Such level of detail leads to high storage but is usually unnecessary especially when the object is rendered at a distance. However, naïve downsampling often loses intrinsic shadowing structures and brightens resulting images (see the insets). Our method computes scaled phase functions, a combined representation of single-scattering albedo and phase function, and provides significantly better accuracy while reducing the data size by almost three orders of magnitude (top-right). AbstractVolumetric micro-appearance models have provided remarkably high-quality renderings, but are highly data intensive and usually require tens of gigabytes in storage. When an object is viewed from a distance, the highest level of detail offered by these models is usually unnecessary, but traditional linear downsampling weakens the object's intrinsic shadowing structures and can yield poor accuracy. We introduce a joint optimization of single-scattering albedos and phase functions to accurately downsample heterogeneous and anisotropic media. Our method is built upon scaled phase functions, a new representation combining abledos and (standard) phase functions. We also show that modularity can be exploited to greatly reduce the amortized optimization overhead by allowing multiple synthesized models to share one set of downsampled parameters. Our optimized parameters generalize well to novel lighting and viewing configurations, and the resulting data sets offer several orders of magnitude storage savings.

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“…Schmidt et al [SNM*13] combined both direct and indirect interactions, allowing manipulation of light paths and retargeting of paths according to edits in the scene. In the field of material editing, recent strides have been made by Hašan and Ramamoorthi [HR13], who built a material designer to interactively set the local (single‐scattering) albedo coefficients and by Klehm et al [KISE14], who enabled stylized property and lighting manipulation of static volumes.…”

Section: Related Workmentioning

confidence: 99%

Consistent Scene Editing by Progressive Difference Images

Günther¹,

Grosch

2015

Computer Graphics Forum

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Even though much research was dedicated to the acceleration of consistent, progressive light transport simulations, the computation of fully converged images is still very time‐consuming. This is problematic, as for the practical use in production pipelines, the rapid editing of lighting effects is important. While previous approaches restart the simulation with every scene manipulation, we make use of the coherence between frames before and after a modification in order to accelerate convergence of the context that remained similar. This is especially beneficial if a scene is edited that has already been converging for a long time, because much of the previous result can be reused, e.g., sharp caustics cast or received by the unedited scene parts. In its essence, our method performs the scene modification stochastically by predicting and accounting for the difference image. In addition, we employ two heuristics to handle cases in which stochastic removal is likely to lead to strong noise. Typical scene interactions can be broken down into object adding and removal, material substitution, camera movement and light editing, which we all examine in a number of test scenes both qualitatively and quantitatively. As we focus on caustics, we chose stochastic progressive photon mapping as the underlying light transport algorithm. Further, we show preliminary results of bidirectional path tracing and vertex connection and merging.

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Interactive albedo editing in path-traced volumetric materials

Cited by 28 publications

References 30 publications

Scattering-aware texture reproduction for 3D printing

Scattering-aware texture reproduction for 3D printing

Downsampling scattering parameters for rendering anisotropic media

Consistent Scene Editing by Progressive Difference Images

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