Interactive refraction on complex static geometry using spherical harmonics

Génevaux, Olivier; Larue, Frédéric; Dischler, Jean‐Michel

doi:10.1145/1111411.1111438

Cited by 13 publications

(10 citation statements)

References 25 publications

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“…Later, this approach was improved to handle refraction of nearby geometries [47] and total internal reflection [10]. Génevaux et al [15] also presented a two-sided refraction method using the pre-evaluated light paths to approximate the actual refracted paths. To avoid lengthy precomputation and allow rendering of deformable objects, 2D texture space rayobject intersection approaches were proposed based on linear searching or binary searching pre-captured depth buffers [5,21,29].…”

Section: Real-time Rendering Of Specular Refractionsmentioning

confidence: 99%

Real-time rendering of refracting transmissive objects with multi-scale rough surfaces

Guo

Pan

2015

Vis Comput

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This paper presents an efficient approach to render refracting transmissive objects with multi-scale surface roughness, under distant illumination. To correctly capture both fine-scale surface details and large-scale appearances, and enable real-time processing at various viewing resolutions, we first divide the surface roughness into three levels, namely, micro-scale, meso-scale and macro-scale. Each scale of roughness is modeled and evaluated using different strategies, and the overall roughness is approximated by their spherical convolution. Then, this representation is incorporated into a microfacet-based BTDF model, and multi-scale rough refractions are simulated on both front and back sides of an object as light enters and exits the object. In particular, non-linear filtering methods are applied to both macro-scale geometries and meso-scale bumps to reduce aliasing when viewed across a range of distances. Finally, experimental results illustrate that our approach produces resolution-dependent refraction effects that match supersampled ground truth, while achieving a speed up of several orders of magnitude with hardware acceleration.

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Section: Real-time Rendering Of Specular Refractionsmentioning

confidence: 99%

Real-time rendering of refracting transmissive objects with multi-scale rough surfaces

Guo

Pan

2015

Vis Comput

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“…Refraction poses a bigger challenge than reflection, as even planar refraction can produce non‐linear beams [HH84]. Common techniques often handle only nearly planar refractors [Sou05] or only far away scene objects [GLD06], but not refraction of near objects through arbitrarily‐shaped lens. One possibility to approximate such effects is via image‐based heuristics [Wym05].…”

Section: Previous Workmentioning

confidence: 99%

Non‐Linear Beam Tracing on a GPU

Liu

Wei

Yang

et al. 2011

Computer Graphics Forum

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Beam tracing combines the flexibility of ray tracing and the speed of polygon rasterization. However, beam tracing so far only handles linear transformations; thus, it is only applicable to linear effects such as planar mirror reflections but not to non-linear effects such as curved mirror reflection, refraction, caustics and shadows. In this paper, we introduce non-linear beam tracing to render these non-linear effects. Non-linear beam tracing is highly challenging because commodity graphics hardware supports only linear vertex transformation and triangle rasterization. We overcome this difficulty by designing a non-linear graphics pipeline and implementing it on top of a commodity GPU. This allows beams to be non-linear where rays within the same beam do not have to be parallel or intersect at a single point. Using these non-linear beams, real-time GPU applications can render secondary rays via polygon streaming similar to how they render primary rays. A major strength of this methodology is that it naturally supports fully dynamic scenes without the need to pre-store a scene database. Utilizing our approach, non-linear ray tracing effects can be rendered in real-time on a commodity GPU under a unified framework.

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“…Genevaux et al [Genevaux et al 2006] simulate refractions through several interfaces for static scenes. During a preprocessing stage, light paths are evaluated by tracing rays through the refractive objects from many different entry directions.…”

Section: Related Workmentioning

confidence: 99%

“…This paper presents a technique for approximating the refraction of distant environments at two interfaces in real time. Our approach was inspired by the work of Wyman [Wyman 2005a], but contrary to previous techniques for interactive simulation of refraction at multiple interfaces [Wyman 2005a;Genevaux et al 2006], it requires no preprocessing. As a result, it can be directly applied to models undergoing shape deformations and is general in the sense that it can be used with any object representation that can be rasterized on a programmable GPU.…”

Section: Introductionmentioning

confidence: 99%

Real-time refraction through deformable objects

Oliveira

Brauwers

2007

Proceedings of the 2007 Symposium on Interactive 3D Graphics and Games

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Figure 1: Armadillo model refracting a distant environment rendered using ray tracing (left) and using our technique (center). Jumping Armadillo rendered with our technique (right). Our approach requires no preprocessing, allowing real-time rendering of deforming objects. AbstractLight refraction is an important optical phenomenon whose simulation greatly contributes to the realism of synthesized images. Although ray tracing can correctly simulate light refraction, doing it in real time still remains a challenge. This work presents an imagespace technique to simulate the refraction of distant environments in real time. Contrary to previous approaches for interactive refraction at multiple interfaces, the proposed technique does not require any preprocessing. As a result, it can be directly applied to objects undergoing shape deformations, which is a common and important feature for character animation in computer games and movies. Our approach is general in the sense that it can be used with any object representation that can be rasterized on a programmable GPU. It is based on an efficient ray-intersection procedure performed against a dynamic depth map and carried out in 2D texture space. We demonstrate the effectiveness of our approach by simulating refractions through animated characters composed of several hundred thousand polygons in real time.

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Interactive refraction on complex static geometry using spherical harmonics

Cited by 13 publications

References 25 publications

Real-time rendering of refracting transmissive objects with multi-scale rough surfaces

Real-time rendering of refracting transmissive objects with multi-scale rough surfaces

Non‐Linear Beam Tracing on a GPU

Real-time refraction through deformable objects

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