公开(公告)号：US11094111B2

公开(公告)日：2021-08-17

申请号：US17041650

申请日：2018-03-30

申请人： Peking University

发明人： Sheng Li ,  Zehui Lin ,  Xinlu Zeng ,  Guoping Wang

IPC分类号： G06T15/50 ,  G06T15/06

摘要： A progressive photon mapping method based on statistical test includes launching rays from the viewpoint to each pixel on the image plane and intersecting the three-dimensional scene to be rendered. If an intersection with diffuse surface is found on the tracing path, it is recorded as the hit point; a photon pass is performed: 31) performing photon tracing step; 32) performing photon collection processing for each hit point; 33) if the current iteration of photon pass does not need chi-square test, then performing flux accumulation and keeping the collection radius unchanged; if chi-square is required, evaluating the photon distribution quality; computing a collection radius according to the estimated photon distribution, and performing the flux accumulation in the current photon pass; 34) if the photon collection radius is reduced, then performing distributed ray tracing, generating new hit points, and go to 31), otherwise go to 31), start a new iteration of photon pass.

公开(公告)号：US20210118222A1

公开(公告)日：2021-04-22

申请号：US17041650

申请日：2018-03-30

申请人： Peking University

发明人： Sheng Li ,  Zehui Lin ,  Xinlu Zeng ,  Guoping Wang

IPC分类号： G06T15/50 ,  G06T15/06

摘要： A progressive photon mapping method based on statistical test includes launching rays from the viewpoint to each pixel on the image plane and intersecting the three-dimensional scene to be rendered. If an intersection with diffuse surface is found on the tracing path, it is recorded as the hit point; a photon pass is performed: 31) performing photon tracing step; 32) performing photon collection processing for each hit point; 33) if the current iteration of photon pass does not need chi-square test, then performing flux accumulation and keeping the collection radius unchanged; if chi-square is required, evaluating the photon distribution quality; computing a collection radius according to the estimated photon distribution, and performing the flux accumulation in the current photon pass; 34) if the photon collection radius is reduced, then performing distributed ray tracing, generating new hit points, and go to 31), otherwise go to 31), start a new iteration of photon pass.