In computer graphics, designing efficient Global Illumination methods is a hot research topic. These methods consist in computing the light distribution inside a 3D scene. There exist several global illumination-based rendering methods, but one popular approach is based on Virtual Point Light (VPL). It is a two-step approach. First, the algorithm generates VPLs that act as secondary light sources (indirect illumination). Second, the radiance of a pixel is computed by summing the contributions of a small set of VPLs (rather than all the VPLs) selected randomly. The most active issues rely on how to select a small set of VPLs that contribute more to the final image. In this paper, we propose two new VPL selection methods using the inverse transform method. To provide realistic images, we propose a Multiple Importance Sampling technique combining an inverse transform method with a gathering approach. The obtained results demonstrate the effectiveness of our methods in terms of image quality and rendering time.
Multimedia Tools and Applications – Springer Journals
Published: Jul 4, 2017
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