I am looking for ways to create a colored model from a STL mesh and an image file. The background story: I am currently preparing my archive of geographical meshes for upload on Shapeways (see the first few attempts here). I have some cool ideas for color printed objects (globes, terrain maps, etc) but I am slightly lost on how to generate the correct file formats. Maybe somebody here can point me in the right direction. The problem: All my meshes are STLs generated by custom software, no 3D modelling program is involved. The textures are available as images that need to be projected onto the meshes with some projection (usually planar, cubic or cylindrical following the nomeclature from here). This Shapeways tutorial mentions that all textures have to be UV-textures. I have no idea what that even means. How can I go from that data to the formats required by Shapeways? Does anybody know what software I can use to convert my STL and image files to X3D/VRML+Texture? I usually work with Solidworks, 123D, Meshlab and Netfabb, and am happy to install any other free software.