A method is described which models the interaction of light between diffusely reflecting surfaces. Current reflection used in computer graphics do not account for object-to-object diffuse surfaces, and thus incorrectly compute global illumination effects. The new procedure, based on methods thermal engineering, includes effects sources finite area, as well "color-bleeding" are caused by reflections. simple environment to illustrate these simulated presented with photographs a physical model....

This paper presents a comprehensive method to calculate object diffuse reflections within complex environments containing hidden surfaces and shadows. In essence, each in the environment is treated as secondary light source. The provides an accurate representation of "diffuse" "ambient" terms found typical image synthesis algorithms. phenomena "color bleeding" from one surface another, shading shadow envelopes, penumbras along boundaries are accurately reproduced. Additional advantages...

A reformulated radiosity algorithm is presented that produces initial images in time linear to the number of patches. The enormous memory costs are also eliminated by computing form-factors on-the-fly. technique based on approach rendering progressive refinement. provides a useful solution almost immediately which progresses gracefully and continuously complete solution. In this way competing demands realism interactivity accommodated. brings use for interactive within reach has implications...

Article Free AccessNon-linear approximation of reflectance functions Share on Authors: Eric P. F. Lafortune Program Computer Graphics, Cornell University, 580 Rhodes Hall, Ithaca, NY NYView Profile , Sing-Choong Foo Blue Sky Studios, Harrison, and Kenneth E. Torrance Donald Greenberg Authors Info & Claims SIGGRAPH '97: Proceedings the 24th annual conference graphics interactive techniquesAugust 1997 Pages 117–126https://doi.org/10.1145/258734.258801Online:03 August 1997Publication History...

A new general reflectance model for computer graphics is presented. The based on physical optics and describes specular, directional diffuse, uniform diffuse reflection by a surface. reflected light pattern depends wavelength, incidence angle, two surface roughness parameters, refractive index. formulation self consistent in terms of polarization, roughness, masking/shadowing, energy. applies to wide range materials finishes provides smooth transition from diffuse-like specular as the...

A method is described which models the interaction of light between diffusely reflecting surfaces. Current reflection used in computer graphics do not account for object-to-object diffuse surfaces, and thus incorrectly compute global illumination effects. The new procedure, based on methods thermal engineering, includes effects sources finite area, as well “color-bleeding” are caused by reflections. simple environment to illustrate these simulated presented with photographs a physical model....

In this paper we develop a computational model of visual adaptation for realistic image synthesis based on psychophysical experiments. The captures the changes in threshold visibility, color appearance, acuity, and sensitivity over time that are caused by system’s mechanisms. We use to display results global illumination simulations illuminated at intensities ranging from daylight down starlight. resulting images better capture characteristics scenes viewed wide range levels. Because is data...

In this paper we develop a computational model of adaptation and spatial vision for realistic tone reproduction. The is based on multiscale representation pattern, luminance, color processing in the human visual system. We incorporate into reproduction operator that maps vast ranges radiances found real synthetic scenes small fixed available conventional display devices such as CRT’s printers. allows to address two major problems reproduction: wide absolute range high dynamic can be...

article Free Access Share on Improved Computational Methods for Ray Tracing Authors: Hank Weghorst View Profile , Gary Hooper Cornell Univ., Ithaca, NY NYView Donald P. Greenberg Authors Info & Claims ACM Transactions GraphicsVolume 3Issue 101 January 1984pp 52–69https://doi.org/10.1145/357332.357335Published:01 1984Publication History 261citation2,448DownloadsMetricsTotal Citations261Total Downloads2,448Last 12 Months425Last 6 weeks48 Get Citation AlertsNew Alert added!This alert has been...

A general radiosity method accounting for all interreflections of light between diffuse and nondiffuse surfaces in complex environments is introduced. As contrasted with previous methods, are no longer required to be perfectly reflectors emitters. complete, viewer independent description the leaving each surface direction computed, allowing dynamic sequences images rendered little additional computation per image. Phenomena such as "reflection tracking", reflections following a moving...

A new general reflectance model for computer graphics is presented. The based on physical optics and describes specular, directional diffuse, uniform diffuse reflection by a surface. reflected light pattern depends wavelength, incidence angle, two surface roughness parameters, refractive index. formulation self consistent in terms of polarization, roughness, masking/shadowing, energy. applies to wide range materials finishes provides smooth transition from diffuse-like specular as the...

Lightcuts is a scalable framework for computing realistic illumination. It handles arbitrary geometry, non-diffuse materials, and illumination from wide variety of sources including point lights, area HDR environment maps, sun/sky models, indirect At its core new algorithm accurately approximating many lights with strongly sublinear cost. We show how group can be cheaply approximated while bounding the maximum approximation error. A binary light tree perceptual metric are then used to...

Human vision takes time to adapt large changes in scene intensity, and these transient adjustments have a profound effect on visual appearance. This paper offers new operator include appearance animations or interactive real-time simulations, match user's responses those the user would experience real-world scene.

We present a method to accelerate global illumination computation in prerendered animations by taking advantage of limitations the human visual system. A spatiotemporal error tolerance map, constructed from psychophysical data based on velocity dependent contrast sensitivity, is used rendering. The map augmented model attention order account for tracking behavior eye. Perceptual acceleration combined with good sampling protocols provide solution feasible use animation. Results indicate an...

The sources of visual information that must be present to correctly interpret spatial relations in images, the relative importance different with regard metric judgments and ways task which images are used affect information's usefulness discussed. Cue theory, states system computes distances objects environment based on from posture eyes patterns light projected onto retinas by environment, is presented. Three experiments influence pictorial cues perceived computer-generated was assessed...

Normal human color perception is a product of three independent sensory systems. By mirroring this mechanism, full-color display devices create colors as mixtures primaries. Any displayable can be described by the corresponding values these Frequently it more convenient to define various other spaces, or coordinate systems, for representation manipulation. Several such spaces are presented which suitable applications involving user specification color, along with defining equations and...

The radiosity method models the interaction of light between diffusely reflecting surfaces and accurately predicts global illumination effects. Procedures are now available to simulate complex environments including occluded textured surfaces. For accurate rendering, environment must be discretized into a fine mesh, particularly in areas high intensity gradients. interdependence implies solution techniques which computationally intractable. This article describes new procedures predict...

In this paper we introduce a new light reflection model for image synthesis based on experimental studies of surface gloss perception. To develop the model, we've conducted two experiments that explore relationships between physical parameters used to describe reflectance properties glossy surfaces and perceptual dimensions appearance. first experiment use multidimensional scaling techniques reveal dimensionality perception simulated painted surfaces. second magnitude estimation methods...

We introduce a new concept for accelerating realistic image synthesis algorithms. At the core of this procedure is novel physical error metric that correctly predicts perceptual threshold detecting artifacts in scene features. Built into computational model human visual system's loss sensitivity at high background illumination levels, spatial frequencies, and contrast levels (visual masking). An important feature our it handles luminance-dependent processing spatiallydependent independently....

A general light transfer simulation algorithm for environments composed of materials with arbitrary reflectance functions is presented. This removes the previous practical restriction to ideal specular and/or diffuse environments, and supports complex physically based distributions, accomplished by extending two-pass ray-casting radiosity approaches handle non-uniform intensity resolving all possible energy transfers between sample points. An implementation described on a spherical harmonic...

We present a real-time robot motion planner that is fast and complete to resolution. The technique guaranteed find path if one exists at the resolution, all paths returned are safe. can handle any polyhedral geometry of obstacles, including disjoint highly concave unions polyhedra.The uses standard graphics hardware rasterize configuration space obstacles into series bitmap slices, then dynamic programming create navigation function (a discrete vector-valued function) calculate in this...

Classical ray-tracing techniques, which have produced the most realistic computer-generated images to date, are being enhanced in this developmental system.

View-independent and view-dependent image synthesis techniques, represented by radiosity ray tracing, respectively, are discussed. View-dependent techniques found to have advantages for calculating the specular component of illumination view-independent diffuse component. Based on these observations a methodology is presented simulating global within complex environments using two-pass approach. The first pass based hemi-cube algorithm, with extensions include effects transmission,...

Normal human color perception is a product of three independent sensory systems. By mirroring this mechanism, full-color display devices create colors as mixtures primaries. Any displayable can be described by the corresponding values these Frequently it more convenient to define various other spaces , or coordinate systems, for representation manipulation. Several such are presented which suitable applications involving user specification color, along with defining equations and...