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This paper proposes a new hybrid algorithm for sampling virtual point light(VPL). The indirect lighting calculation of the scene is used to distribute theVPL reasonably. In the process of generating VPL, we divide the scene into twoparts according to the camera position and orientation. The close-range part:the part that the camera pays attention to. The distant-range part: the partthat the camera does not pay attention to or rarely pays attention to. For theclose-range part, we use a patch-based vPL sampling method to distribute theVPL as evenly as possible on the patch in the near-field area; for thedistant-range part, we use sparse instant radiosity (IR) for sampling. It turnsout that, in contrast to conventional multiple instant radiance Compared withthe VPL generation algorithm, the method proposed in this paper can greatlyimprove the quality of the final result graph when the number of VPLs is thesame; Under the same rendering quality, the rendering speed can be greatlyimproved.

A Virtual Point Light Generation Method in Close-Range Area