Hi Peter, Chimera can output VRML and X3D which is the next generation of VRML. We also have some code to output OBJ format but it is not included in the distribution. In Chimera snapshot version 1.2129 the VRML output is done with menu entry File / Export Surfaces.... As the name implies it only writes out surfaces (molecular surfaces, volumemetric contour surfaces, ...). It does not output molecular models (eg. ball and stick representations). The X3D output handles surfaces and molecular models and is accessible using the Chimera command "x3dsave". You would use Chimera menu entry Favorites / Command Line, and then type x3dsave. Here is documentation http://www.cgl.ucsf.edu/chimera/docs/UsersGuide/midas/x3dsave.html The main trouble with X3D is that it is a very new standard and few program support this format. Our plan is to write or use outside conversion software to go from X3D to more widely used formats. This should happen in the next 6 months. The Wavefront OBJ output is only for volumemetric contour surfaces and surfaces from the multiscale model tool. I wrote it for a specific user and could provide it to you if you like. It is not in the Chimera distribution. Tom