How do I Join two ModelSpaces together

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FinnM
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How do I Join two ModelSpaces together

Post by FinnM »

I have a low res scan of an area and I need to join it with a high res scan of an object in that area how to I do this?

Currently I have tried merging the two Model Spaces with each other but I can seem to find a way to align them.

Thanks for any help
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Re: How do I Join two ModelSpaces together

Post by Scott.Warren »

Hey Finn,

If you have 2 scans that do not contain any form of control (I'm assuming no targets/spheres in your 2 modelspaces), you can align them using a new registration. Basically in Cyclone, a Registration is the framework that allows scans to be aligned and related to each other. Once you create a new registration, add the 2 scanworlds to it, and then use the visual registration tools to match them up. The video below does a good job of going through the motions.

Instructional video

youtu.be/Tg1OqJzJSno
https://www.youtube.com/watch?v=Tg1OqJzJSno

Let us know if you have any further questions,
Scott Warren
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Re: How do I Join two ModelSpaces together

Post by FinnM »

Thanks for the reply but I may have worded the original questions wrong as that is not what i am looking for. I have two already frozen registrations that have been trimmed. These scans are of the same site but a couple of months apart. What I need to do is to join these two already frozen and trimmed model spaces. There is significant overlap so this should work. I did try to create a new registration and put both ScanWorlds in there but when I try visual registration it says 'The Visual Alignment View require single ScanWorlds. The ScanWorld/s can not be registration ScanWorlds.' When I try select three point and use cloud constraint it does not come up with any errors but when I register it and view interim results nothing seems to have happened
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Re: How do I Join two ModelSpaces together

Post by jamesworrell »

Assumed - arbitrary and different - coordinates for each scanworld?

Create a series of "corners" - same corners in each scanworld, create a vertex at the corner and give it a registration label - same in each scanworld - case sensitive.

Gist of it:


1) Create 3 small patches on the same geometry available in both scanworlds that wouldn't have moved - looking for 3 x internsecting planes to create nice sharp corners or at least planes (ignoring bevels eg on concrete) - select the flat part - try to aim for the same patch size etc to be consistent;
2) Create a vertex at the intersection;
3) Add rego label;
4) Repeat in other scanworld;
5) Create a new rego;
6) Add whichever scanworld coordinates you want to use first - that will be the home scan world (bold);
7) Add constraints;
8) Check errors;
9) Freeze etc.

When creating the geometry - I tend to fence and copy to new modelspace .. do the geometry in there .. once you have your vertex, delete the patches and the point cloud - merge only the vertex back in - keeps things cleaner.

If level scanworlds .. need a minimum of two .. but more redundancy will give you an idea of how well you have picked the planes - you can disable any outliers.
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Re: How do I Join two ModelSpaces together

Post by JGlauser »

When you have two frozen registrations you first need to open the modelspace of each scanworld and select all point data and go to:

Tools --> Registration --> Copy to control space.

You can now create a new registration, add the two scanworlds to it, go to the modelspaces tab, collapse down the the two scanworlds in there and double click the control spaces of each scanworld.

Make sure the home scanworld is set correctly

This will open the traditional C2C environment. You can then pick common points, add cloud constraint and register.

With frozen jobs like this the amount of data is larger than normal. Its useful to head to your preferences and consider changing:

Registration: Default subsample percentage (80%)
Registration: Default max iterations (up to 1000)
Registration: Default max search distance (Default .100 - sometimes increasing OR Decreasing this number by a factor of two can give a better alignment)
Registration: Default subsample spacing (Default 0.5, can change to 0.2 or 0.3, massively increases alignment time)
Pointcloud: Computation max points millions (default 1.5 - take this up to 10 or more if you like, massively increases alignment time).

Make sure you check in interim results using quickslice etc!
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Re: How do I Join two ModelSpaces together

Post by FinnM »

I have tried this but after I have registered the scans and view the interim results nothing seems to have changed.
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Re: How do I Join two ModelSpaces together

Post by Shrinivas »

FinnM wrote: Thu May 24, 2018 11:13 pm I have tried this but after I have registered the scans and view the interim results nothing seems to have changed.
Hi,

I have worked with the following scenario quite a lot, be it of Sister Vessels or scanning the same area after a year or two.

By default, interim results do not merge the targets and you will see the absolute error between them.
I have only used c2c for such cases and then fine-tune the parameters to accommodate for acceptable deviation.
Parameters: I try to ensure I have 20,000 Points overlapping
Max 15mm of search radius for c2c
Min 1000 Iterations
It has always worked for me.
Cheers and good luck.
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Re: How do I Join two ModelSpaces together

Post by Gcutting »

Here is a quick video of how to register using a box with 3 targets to get Registration Scanworlds to come together (or really any two Scanworlds). Keep in mind that Interim results may not always show you the updated status of the registration.

https://scanswfs.leica-geosystems.com/dl/lLobIQn68j

Guy
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LFD file generation

Post by sachinimtac »

Hi,,Everyone,
i am using faro scene and my clients want the .lfd file.
i can not export .lfd file from scan.

My client is going to use E3D software, excluding .lfd any other format can be import in E3D?
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Re: How do I Join two ModelSpaces together

Post by Graham »

The LFD is the only dataset type that can be read by the laser server from AVEVA. Leica CloudWorx can be used with PDMS, but if you want the full integration of laser data offered in E3D you will have to go down the LFD route. Exporting the scans using E57 or using the original scans and loading them into LFM will allow you client to have access to BubbleViews, HyperBubble, laser in Draw etc.
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