To add to that, the use of .obj has actually been a bit of a problem at times, because the format doesn't support some of the features the N64 does, such as vertex colors. There had been some talk about alternatives - like extending the .obj format with custom tags (like IIRC cooliscool did for Bottles' Glasses, adding a "vc" tag for vertex colors), using other formats like DirectX .x, or even creating a custom format - but they either didn't catch on, were shot down because modelling software wouldn't support them (like .obj extensions), were never developed (any custom formats; at least as separate files, Model2N64 did use one internally), etc, etc...