This option enables clustering elements under user-defined part IDs according to a given grayscale image. Grayscale image files must be provided in an ASCII-based *.pgm format, which can be exported from any image processing software. The grayscale values assigned to each pixel of the image are assigned to a point cloud which is generated internally. Therefore, you must provide information about the size of the image. The generation of the point cloud starts at the bottom-left corner, assigned as the global (0,0,0) coordinate. Therefore, it might be necessary for you to assign simple transformations to the generated point cloud, hereinafter considered as the source mesh.