mzabritski
2010-07-07, 05:26 PM
I've always thought that I had a pretty good understanding of shared coordinates, project basepoints and survey points but I'm having a problem that I can't figure out.
We have a project with an established survey point and an established project base point. From the building model, we've been exporting our AutoCAD backgrounds using the project base point. So far so good. We also have a Revit site model that shares the same shared coordinates and survey point. I noticed that it has different project base point and when exporting to AutoCAD, the dwg 0,0 origin is different than the building backgrounds.
I thought that all I needed to do is in the site model, unclip the project basepoint and move it to the correct location. I did this and everything looks good on the screen. When comparing coordinates between the building and the site, the project basepoint has the same coordinates. However, when I export the site model to DWG using project coordinates, the 0,0 origin of the dwg has not moved. It is still in a random location way to the bottom left of the survey point. I can't seem to get the DWG origin to recognize the project basepoint origin.
Am I doing something wrong? Is this the correct behavior or do I just not fully understand the coordinates?
Thanks
We have a project with an established survey point and an established project base point. From the building model, we've been exporting our AutoCAD backgrounds using the project base point. So far so good. We also have a Revit site model that shares the same shared coordinates and survey point. I noticed that it has different project base point and when exporting to AutoCAD, the dwg 0,0 origin is different than the building backgrounds.
I thought that all I needed to do is in the site model, unclip the project basepoint and move it to the correct location. I did this and everything looks good on the screen. When comparing coordinates between the building and the site, the project basepoint has the same coordinates. However, when I export the site model to DWG using project coordinates, the 0,0 origin of the dwg has not moved. It is still in a random location way to the bottom left of the survey point. I can't seem to get the DWG origin to recognize the project basepoint origin.
Am I doing something wrong? Is this the correct behavior or do I just not fully understand the coordinates?
Thanks