The State of the Art in Interactive Global Illumination

Ritschel, Tobias; Dachsbacher, Carsten; Grosch, Thorsten; Kautz, Jan

doi:10.1111/j.1467-8659.2012.02093.x

Cited by 130 publications

(68 citation statements)

References 211 publications

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“…High quality interactive volumetric illumination methods that have few or no limitations on the illumination complexity are too slow to interactively explore time-varying volumetric data [21]. A comprehensive overview of interactive global illumination techniques can be found in surveys within the topic [16,31]. Here, we focus on interactive methods for volume rendering and progressive methods.…”

Section: Related Workmentioning

confidence: 99%

Correlated Photon Mapping for Interactive Global Illumination of Time-Varying Volumetric Data

Jonsson

Ynnerman

2017

IEEE Trans. Visual. Comput. Graphics

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Abstract-We present a method for interactive global illumination of both static and time-varying volumetric data based on reduction of the overhead associated with re-computation of photon maps. Our method uses the identification of photon traces invariant to changes of visual parameters such as the transfer function (TF), or data changes between time-steps in a 4D volume. This lets us operate on a variant subset of the entire photon distribution. The amount of computation required in the two stages of the photon mapping process, namely tracing and gathering, can thus be reduced to the subset that are affected by a data or visual parameter change. We rely on two different types of information from the original data to identify the regions that have changed. A low resolution uniform grid containing the minimum and maximum data values of the original data is derived for each time step. Similarly, for two consecutive time-steps, a low resolution grid containing the difference between the overlapping data is used. We show that this compact metadata can be combined with the transfer function to identify the regions that have changed. Each photon traverses the low-resolution grid to identify if it can be directly transferred to the next photon distribution state or if it needs to be recomputed. An efficient representation of the photon distribution is presented leading to an order of magnitude improved performance of the raycasting step. The utility of the method is demonstrated in several examples that show visual fidelity, as well as performance. The examples show that visual quality can be retained when the fraction of retraced photons is as low as 40%-50%.

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Section: Related Workmentioning

confidence: 99%

Correlated Photon Mapping for Interactive Global Illumination of Time-Varying Volumetric Data

Jonsson

Ynnerman

2017

IEEE Trans. Visual. Comput. Graphics

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“…Hundreds or thousands of VPLs are often resampled from a reflective shadow map by hierarchical sample warping [12] according to a mipmapped image-based PDF [13]. To generate shadow maps for so many lights, Ritschel et al [14] proposed imperfect shadow maps. In their follow-up paper [7], a bidirectional reflective shadow mapping method was introduced to estimate a viewdependent importance for the image-based PDF.…”

Section: Real-time Global Illuminationmentioning

confidence: 99%

Modified filtered importance sampling for virtual spherical Gaussian lights

Tokuyoshi¹

2016

Comp. Visual Media

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This paper proposes a modification of the filtered importance sampling method, and improves the quality of virtual spherical Gaussian light (VSGL)-based real-time glossy indirect illumination using this modification. The original filtered importance sampling method produces large overlaps of and gaps between filtering kernels for high-frequency probability density functions (PDFs). This is because the size of the filtering kernel is determined using the PDF at the sampled center of the kernel. To reduce those overlaps and gaps, this paper determines the kernel size using the integral of the PDF within the filtering kernel. Our key insight is that these integrals are approximately constant, if kernel centers are sampled using stratified sampling. Therefore, an appropriate kernel size can be obtained by solving this integral equation. Using the proposed kernel size for filtered importance samplingbased VSGL generation, undesirable artifacts are significantly reduced with a negligibly small overhead.

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“…However, despite the wide variety of proposed interactive approaches [Ritschel et al 2012], none of them appears to be particularly well suited for dealing with many primary lights with complex emission profiles. Moreover, any method can be expected to entail substantially increased iteration times.…”

Section: Limitations and Future Workmentioning

confidence: 99%

Procedural Design of Exterior Lighting for Buildings with Complex Constraints

Schwarz

Wonka

2014

ACM Trans. Graph.

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We present a system for the lighting design of procedurally modeled buildings. The design is procedurally specified as part of the ordinary modeling workflow by defining goals for the illumination that should be attained and locations where luminaires may be installed to realize these goals. Additionally, constraints can be modeled that make the arrangement of the installed luminaires respects certain aesthetic and structural considerations. From this specification, the system automatically generates a lighting solution for any concrete model instance. The underlying, intricate joint optimization and constraint satisfaction problem is approached with a stochastic scheme that operates directly in the complex subspace where all constraints are observed. To navigate this subspace efficaciously, the actual lighting situation is taken into account. We demonstrate our system on multiple examples spanning a variety of architectural structures and lighting designs.

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The State of the Art in Interactive Global Illumination

Cited by 130 publications

References 211 publications

Correlated Photon Mapping for Interactive Global Illumination of Time-Varying Volumetric Data

Correlated Photon Mapping for Interactive Global Illumination of Time-Varying Volumetric Data

Modified filtered importance sampling for virtual spherical Gaussian lights

Procedural Design of Exterior Lighting for Buildings with Complex Constraints

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