There are a number of ArtCAM relief files available for download, which can be converted to a useable format,
if a person owns the pricy program. Without the program, was unable to find any conversion program, as the .rlf files
are copy protected in various ways. Using the ArtCAM2011 DemoExpress, with screen capture, conversion to 1600x700 BMP,
processing by ZSurf4, an IGES model is formed, which can be imported into MoI. (ZSurf4 calls the IGES model a NURBS model, which may be
incorrect?) As far as I know, this is OK to do. (?)

This is the test Eagle. (PNG minified)