Illumination information cache calculation method and system for global illumination of volume data

The invention provides an illumination information cache calculation method and system for global illumination of volume data. The method comprises the following steps: S1, calculating a slice axis; s2, slicing and storing the volume data on the slicing axis; the method specifically comprises the following steps: firstly, reading volume data, then slicing in the slice axis direction, and storing each slice in a 3D texture; s3, calculating illumination information of each slice, and storing the illumination information in a texture 2D array; and S4, calculating and sampling in the illumination information cache, and applying a calculation result to calculation of global illumination of the volume data. The overall illumination calculation process of the volume data can be simplified through illumination attenuation calculation based on the slices, flexible performance can be obtained by changing the distance of the slices and the image resolution of each slice, and expandability in performance and effect is ac