what is the project base point ?

[rlabib]

I'm in the process of creating a new template and I found this post which is very helpful

http://www.revitforum.org/tutorials-tips-tricks/1004-building-revit-template.html

number 2 in the post it says the following

"2. In the template, Find the origin. It may seem silly now, but when you realize it isn’t where you thought later, you’ll me bad. In the old days it meant imported a CLEAN .dwg with nothing but an X drawn at 0,0,0 Origin to Origin, marking that spot with reference planes, and pinning it. Now, you can turn on the Project Base Point / Survey point, and mark THAT with reference planes. My advice? Name them Origin N/S and Origin E/W, pin them, and call it a day. THEN, open your first blank TITLEBLOCK, and do the CAD trick, import the dwg OTO, and mark that with reference planes. Pin. Save as “1st titleblock” and close. (It WILL matter later)."

OK here is my question:

what is the project base point , and where can I find it?

[ccollins · Accepted solution]

The Project Base Point is the point where Revit's Origin is located.

You can turn it on in VG>Model Categories>Site>Project Base Point.

Do a search on Shared Coordinates in this and other Revit forums, and the Wiki Help.

[rlabib · Accepted solution]

Cliff,

Thanks again , I'll be posting a lot of questions because I'm building my first template. 

[ccollins]

Check out this post:

http://www.revitforum.org/tutorials-tips-tricks/1004-building-revit-template.html#post9779

Good luck!

[Alfredo_Medina]

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@ccollins wrote:

The Project Base Point is the point where Revit's Origin is located.

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I disagree with that definition. Suppose that you select the project base point, unclip it, and move it away from the original location. Now the project base point is at one place, and Revit's Origin is at a different place, and if now you insert a link by Origin to Origin, the link's origin will be exactly where the project base point was, the original, default location, not where it is now. Therefore, the project base point cannot be defined as the point where Revit's origin is located.

I would define it as a point of reference for the project, which marks the origin of the building's coordinate system. The Revit file has 3 coordinate systems, one for the building, one for the site, and one "internal" (the actual origin of the Revit file). At the beginning, all three systems are aligned and have their origins at the same place. If the project base point is moved (clipped), the building moves on the screen, and the internal origin moves along because it is clipped. But if the project base point is unclipped and relocated, now the project base point is at one location, and the internal Revit's origin is at a different location.

[ccollins]

Alf,

I agree. I should have said "By Default" the PBB is at the "origin".

Your explanantion is correct. ( as ususal!) 

I was just trying to give a new user a simple point of reference.

[Alfredo_Medina]

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@ccollins wrote:

Alf,

I agree. I should have said "By Default" the PBB is at the "origin".

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That's correct. Thanks for clarifying. 🙂

[becmez]

Could one of you explain whether the following situation can be fixed easily?  

A project was started in Revit without any attention paid to the project base point.  The whole building is modeled and some documentation has begun.  The project consultants will be collaborating in Revit but we haven't shared the model yet.  In preperation for that, we found that our "Project North" should have been rotated but it breaks too much to do that now.  We also found that the "Project Base Point" and the "Survey Point" are in the middle of the building floor plate and we want it to be on an intersection of the property line.  Is it going to mess anything up to move it now?  Or should we just leave it?

I haven't been able to find anything on the other forums that address this situation exactly.  

[Alfredo_Medina]

If you don't move those points from their default location, every party in the team can use "origin to orgin" all the time, as the method of insertion for links, and everything will be at peace in Revitland.