Academic
Publications
Frequency space environment map rendering

Frequency space environment map rendering,10.1145/566570.566611,ACM Transactions on Graphics,Ravi Ramamoorthi,Pat Hanrahan

Frequency space environment map rendering   (Citations: 106)
BibTex | RIS | RefWorks Download
We present a new method for real-time rendering of objects with complex isotropic BRDFs under distant natural illumination, as specified by an environment map. Our approach is based on spherical frequency space analysis and includes three main contributions. Firstly, we are able to theoretically analyze required sampling rates and resolutions, which have traditionally been determined in an ad-hoc manner. We also introduce a new compact representation, which we call a spherical harmonic reflection map (SHRM), for efficient representation and rendering. Finally, we show how to rapidly prefilter the environment map to compute the SHRM---our frequency domain prefiltering algorithm is generally orders of magnitude faster than previous angular (spatial) domain approaches.
Journal: ACM Transactions on Graphics - TOG , vol. 21, no. 3, pp. 517-526, 2002
Cumulative Annual
View Publication
The following links allow you to view full publications. These links are maintained by other sources not affiliated with Microsoft Academic Search.
    • ...2.1 Parameterization of Reflectance Functions Halfway [15] and reflected vector [21] parameterizations for BRDFs have been shown to be effective in modeling highly specular materials...
    • ...Previous approaches have modeled (spatially varying) reflectance fields usingparametrickernels[7],[23],[24],[25],polynomials[26], [27], radial basis functions [12], [16], [28], [29], spherical harmonics [21], [30], [31], and wavelets [32]...
    • ...It may also be effective to first apply linear or nonlinear projections to obtain some special parameterizations [15], [16], [18], [21], [22], and then linearly combine themtoconstructfinalparameterizationfunctions.Thesecan be considered as generalizations of previous traditional parameterizations.Inthecurrentimplementation,wechoose (12) simply because it includes popular fixed parameterizations (halfway, illumination, and view directions) ...

    Yu-Ting Tsaiet al. Modeling Bidirectional Texture Functions with Multivariate Spherical R...

    • ...This also implies that the surface reflection may be efficiently evaluated in the frequency domain [15], which is the basic idea of many precomputed radiance transfer algorithms [16]...

    Chia-kai Lianget al. Light Field Analysis for Modeling Image Formation

    • ...Various spherical base were proposed for encoding the spherical illumination, including spherical harmonics (SHs) [7], [9], [10], [11], [13], spherical wavelet [14], [15], cubemap-based spherical wavelet [16], and spherical radial basis function (SRBF) [17], [18], [19]...
    • ...Early works in PRT mainly employ SH [8], [9], [10], [13], [24]...

    Ping-Man Lamet al. All-Frequency Lighting with Multiscale Spherical Radial Basis Function...

    • ...Instead, the data is usually either fitted to an analytical model (Ward 1992; Lafortune et al. 1997; Ngan et al. 2005) or projected into a suitable basis (Westin et al. 1992; Ramamoorthi and Hanrahan 2002; Basri and Jacobs 2003 ;N g et al.2003)...
    • ...Most researchers therefore represent their BRDFs as either analytical reflectance models (Ward 1992; Lensch et al. 2001; Gardner et al. 2003), or generic function bases such as polynomials (Koenderink et al. 1996; Malzbender et al. 2001), spherical harmonics (Westin et al. 1992; Ramamoorthi and Hanrahan 2002; Basri and Jacobs 2003), Zernike polynomials (Koenderink et al. 1996), hemispherical basis (Gautron et al. 2004) or wavelets ...

    Abhijeet Ghoshet al. A Basis Illumination Approach to BRDF Measurement

    • ...Since these models generally do not account for all the reflectance properties of all kinds of materials, approaches to representing reflectances on basis functions have recently been developed to describe reflectances from a wider range of material surfaces [2] [20] [21]...

    Chanki Yuet al. Global optimization for estimating a BRDF with multiple specular lobes

Sort by: