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One of the most complex areas of Game Modification, Modeling is the process used to edit the 3D models of anything in the game, including (but not limited to) Rock Raiders, Rock Monsters, and Buildings. It is done using a specialised program. The most popular free one is Blender, however, like many Modeling programs, it is a very complex program.
The RRU community has recently been experimenting with this aspect of modding with respect to the Rock Raiders PC game, mainly from Cirevam, who has created numerous LWO and LWS modifications, most of which come with (somewhat) successful results eventually.