Export OBJ with correct geolocation

[andrewYSHR2]

I'm new to Revit, so apologies if it's something obvious but I've looked everywhere and still need help with the last bit of my puzzle.

I'm trying to export a 3D model as an OBJ, with the correct geolocation. My survey point is correct, angle to true north of the project base is correct, I'm sure this is just an export issue? I can't find any way to 'export to shared coordinates' as you can with DXF/DWG/IFC export options. I've tried the built in OBJ exporter, and an add on exporter with the same results, it always seems to come out on project base coordinates

Any help is gratefully received 

[stefan_gokstorp]

i might be wrong but i dont think the actully coordinates are stored within the obj format i think its uses the coordinate system you have in your active view try changing your coordinate system via location before exporting. and test changing from project north to true north might work but i am as i said guessing.

[andrewYSHR2]

Thankd for getting back to me Stefan. I was starting to come to the same conclusion but I've not figured it out just yet.

My survey point is correct to real world coords, and the project base point is the same, with a rotation away from true North. I know I can set the orientation to 'True north' on any of the 2d plans, but it's not an option in the 3d view (for obvious reasons I suppose) I've tried changing project north to match true north a couple of different ways but it's exporting just the same

So far I can apply a transformation to the OBJ in other software, which moves it into the right area, but it's still off by the 'true north vs project north' amount of about 45deg centred around the survey/project point. If I can export to true north and then transform I think it will do it. 

(I should probably point out this is someone elses model that I have been given, I'm just trying to convert it)