Efficient Calculation Method of Spherical Signed Distance Functionfor Real-time

彬彬

1 Introduction

Real-time rendering of dynamic scenes illuminated by complex,

all-frequency lighting with highly glossy BRDFs remains a challenging

problem. Although several methods have been proposed

to render dynamic scenes, these methods can not handle

deformable objects [Zhou et al. 2005], all-frequency lighting

[Ren et al. 2006; Nowrouzezahrai et al. 2009], or highly glossy

BRDFs [Annen et al. 2008].

We propose a real-time rendering method for dynamic scenes under

all-frequency environmental lighting. To render the object surfaces,

the product of the environmental lighting, the visibility function

and the BRDF is integrated at each shading point. Our method

represents the environmental lighting and the BRDFs with spherical

Gaussians and represents the visibility functions with spherical

signed distance functions (SSDFs). Although these representations

enable us to render scenes under all-frequency lighting in real-time,

the previous method [Wang et al. 2009] is limited to static scenes

since the computational costs of SSDFs are quite high.

To address this problem, we propose a simple but efficient calculation

method of SSDFs by approximating the object geometries with

a set of spheres. Our GPU implementation achieves real-time rendering

of fully dynamic scenes where the viewpoints, lighting, and

BRDFs can be changed at run-time and objects can move, rotate

and deform in real-tim

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奇

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