这个工具用来合并VR的光子图，如果同一场景有多角度相机渲染，或是动画渲染的话，合并光子图就比较重要。可以把多个不同角度的光子图合并成一个总文件。 This script merges multiple *.vrmap files from a selected folder. Tested on Max 2012, Vray 2.0. The benefit of rendering separate irradiance maps is that you can use distributed rendering. As with multi-frame incremental method, the map gets overwritten if multiple machines are being used.