Linear efficient antialiased displacement and reflectance mapping

Abstract

Figure 1: A high-quality animated production model (Ptex T-rex model c Walt Disney Animation Studios.) rendered in real time under directional and environment lighting using LEADR mapping on an NVidia GTX 480 GPU. The surface appearance is preserved at all scales, using a single shading sample per pixel. Combined with adaptive GPU tessellation, our method provides the fastest, seamless, and antialiased progressive representation for displaced surfaces. AbstractWe present Linear Efficient Antialiased Displacement and Reflectance (LEADR) mapping, a reflectance filtering technique for displacement mapped surfaces. Similarly to LEAN mapping, it employs two mipmapped texture maps, which store the first two moments of the displacement gradients. During rendering, the projection of this data over a pixel is used to compute a noncentered anisotropic Beckmann distribution using only simple, linear filtering operations. The distribution is then injected in a new, physically based, rough surface microfacet BRDF model, that includes masking and shadowing effects for both diffuse and specular reflection under directional, point, and environment lighting. Furthermore, our method is compatible with animation and deformation, making it extremely general and flexible. Combined with an adaptive meshing scheme, LEADR mapping provides the very first seamless and hardware-accelerated multi-resolution representation for surfaces. In order to demonstrate its effectiveness, we render highly detailed production models in real time on a commodity GPU, with quality matching supersampled ground-truth images.

State-of-the-art review of solar design tools and methods for assessing daylighting and solar potential for building-integrated photovoltaics

“…Improved version, that includes discrete stochastic for random spatial variation of BRDF, is presented recently [174]. In order to solve antialiasing of surfaces using high-level of details using microfacet models at all scales Dupuy et al proposed Linear Efficient Antialiased Displacement and Reflectance (LEADR) Mapping [175]. Multi-scale approach of rendering composite materials, whose morphological structures are defined at several embedded scales, using homogenization process was shown in [176].…”

Skin microstructure deformation with displacement map convolution

“…Accurately modeling and efficiently rendering the subtle reflection effects of surface microstructure has been an area of significant recent interest [Dupuy et al 2013;Jakob et al 2014;Yan et al 2014] for man-made materials. The technique proposed by [Dupuy et al 2013] admits a microstructure scaling factor which can uniformly reduce or increase the amplitude of surface microstructure as a material deforms.…”

“…The technique proposed by [Dupuy et al 2013] admits a microstructure scaling factor which can uniformly reduce or increase the amplitude of surface microstructure as a material deforms. Our work models a richer set of deformation-based reflectance effects by directionally blurring and sharpening the surface microstructure based on local surface strain, and we tune this filtering to match measurements of real skin patches.…”

“…Second, while the results in this paper were made using supersampling for antialiasing, efficient rendering of dynamic microstructure should leverage multiresolution surface detail rendering techniques such as LEAN [Olano and Baker 2010] or LEADR [Dupuy et al 2013] mapping. LEADR mapping may be especially relevant since it is designed to work with deformable animated surfaces and includes a microfacet BRDF model with masking and shadowing.…”

Screen-Space Normal Distribution Function Caching for Consistent Multi-Resolution Rendering of Large Particle Data

“…Screen-space normal distribution functions (S-NDFs) and screen-space mipmaps (S-MIPs) enable interacting with large-scale particle data without re-sampling the particles after every interaction. A high-quality visualization of a Copper-Silver Mixture is updated in real time after user operations, including changing the lighting environment, e.g., the light direction, as shown in T 1 , T 2 , and T 3 , changing the specular exponent of the material, as shown in T 4 and T 5 , changing the transfer function, as shown in T 6 , T 7 , and T 8 , or zooming out (vertical direction).…”