Not sure which forum this comes under. My FSX export for 3D canvas was used to export a model of around 26,000 polygons. The MDL file was created, but the final message was: warning : Index buffer exceeds maximum size Which sounds a little ominous. I delved into xtomdl and found the buffer limit is 65535 and this seems to be the total number of vertices for all polys in the model (i.e. polys * 3) Which would limit models to about 21,000 polys! I assume this is for older graphics cards that could only support 16bit index buffers - most are 32bit these days. Has anyone else seen this? and is it a problem?