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Point Cloud Registration

7 ANTWORTEN 7
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Nachricht 1 von 8
Anonymous
669 Aufrufe, 7 Antworten

Point Cloud Registration

I have some point cloud files from a surveyor.  They are registered to the "state plane coordinate system" (in California).  When importing into Revit, this puts the point cloud 1,200 miles away from the Revit Internal origin.  I've tried manually moving the point clouds to the origin which somewhat worked except for this inaccurate "snapping" issue, which makes me question the accuracy of manually positioning the point clouds entirely:  (https://knowledge.autodesk.com/support/revit-products/troubleshooting/caas/sfdcarticles/sfdcarticles...)

Also, I am aware of this issue regarding 10 mile radius:

https://knowledge.autodesk.com/support/revit-products/learn-explore/caas/CloudHelp/cloudhelp/2018/EN...

 

Is there an updated workflow that allows us to keep the accuracy of the coordinate system intact?  Surveyor said he hasn't had issues with other architects using the "state plane" coordinates for his point clouds in Revit.

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Nachricht 2 von 8
Anonymous
als Antwort auf: Anonymous

Just to add further clarification....

I could import "center-to-center" but that completely loses my coordinates (I think).  Also, if I bring in multiple point clouds, they won't be on a common real-world coordinate system.  So I lose that X,Y coordinate information using "center-to-center" placement.

Nachricht 3 von 8
barthbradley
als Antwort auf: Anonymous

By Shared Coordinates is when the Point Cloud Origin is place at the Revit Project Survey Point Origin.  You can't Acquire Coordinates from a Point Cloud, or Publish Coordinates to it.   

 

Where is your Survey Point located in relationship to the Internal Origin and Project Base Point of the Project?  

 

Just unclip the Survey Point and move it and the Point Cloud together, and place the PC where you need it in the Project -- closer to Internal Origin/Project Base Point Startup Location.  

 

edit: oops...not "unclip". Move the clipped Survey Point with the Point Cloud after you insert it by Shared Coordinates. I'm assuming you have NO Shared Coordinates set up presently in the Project.  

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barthbradley
als Antwort auf: Anonymous

...after you have moved the CLIPPED Survey Point with the Point Cloud, you can then UNCLIP the Survey Point and move it closer to the Project Origin.  

Nachricht 5 von 8
Anonymous
als Antwort auf: barthbradley

Thanks for the response!  I did that exact thing prior to posting;  dragged the Survey Point and Point Cloud(s) simultaneously.  Then my survey point is 1200 miles away from the revit internal origin.  OK that's all good.  Then I notice something strange - my (multiple) point clouds aren't lining up as they should be - I try to line them up via manual move or input move, then I get this weird 6" grid snapping behavior while attempting to move them.  Documented here:

https://knowledge.autodesk.com/support/revit-products/troubleshooting/caas/sfdcarticles/sfdcarticles...

The above linked issue is not "solved" if you are trying to preserve a coordinate system across multiple point clouds (kinda the whole point of surveying with 3d scans....)

 

So as I said originally, how do I even know my initial "move" is correct - I just moved the point cloud 1,200 miles - but it's off as much as 6" to 8" - who's to say it didn't "jump" with the Revit glitch???  Just FYI Revit only let's you do the move-input dimension for up to 30,000 feet, so you must drag move in my case.  

Nachricht 6 von 8
barthbradley
als Antwort auf: Anonymous

What version of Revit are you using? 

 

Regarding multiple Point Cloud (PC) placement issues; if all the PC are using the same Coordinate System, then following the procedure I outlined above to place your first PC in the Project, will establish the Shared Position for all the rest. You should only need to insert the others via Shared Coordinates.  

 

If the PCs are all using different origins, then I would go about this a little differently. I'd insert each PC into it's own Revit Project, using the same procedure I outlined above.   Then, instead of inserting the PC directly into the Project, I'd Link in the Project the PC is in instead.  This way you can position/orient each PC in the Host Project, and set up Shared Coordinates between all the Projects.  Make sense?  

Nachricht 7 von 8
Anonymous
als Antwort auf: barthbradley

That makes sense - and I agree it might work.  But with the thousand mile zoom out / blind selection aspect of this - I'm not trying it again takes too long.

 

Revit 2020.

The whole relational aspect of the project / survey / internal origin point is just way overly complex for something that is quite simple.  Every time I touch these I feel like I have to do a few hours of research before I can move anything in the right direction.

Nachricht 8 von 8
barthbradley
als Antwort auf: Anonymous


 


@Anonymous wrote:

I'm not trying it again takes too long.

 


 

What are you going to give up on?  Point Clouds?  I hadn't thought about that solution.  That works too.  Call it a day and go have a beer.   Smiley (zwinkernd)  

 

p.s. want to post one of these PCs?  I'd like to see what you are dealing with.  

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