Polyworks IAlign help for point cloud registration

Discuss PolyWorks here.
John McCarthy
I have made 10-20 posts
I have made 10-20 posts
Posts: 13
Joined: Tue Jun 29, 2010 3:01 pm
Full Name: John McCarthy
Company Details: McCarthy Engineering Inc.
Company Position Title: Scanner
Country: Canada
Linkedin Profile: No

Polyworks IAlign help for point cloud registration

Post by John McCarthy » Wed May 17, 2017 6:11 pm

In Polyworks IAlign I use the "best-Fit" Alignment tool when i know my registrations are close. Once the command is started and it's processing the images, the speed at which it processes these images slows down. By 10 minutes it's half the speed, by half hour it is pretty slow. The only way to remedy this is to stop the processing, save, exit - close the application, reload and start the process again. I have 128 GB of ram, so that can't be my issue? Any suggestions? Thanks.

User avatar
V.I.P Member
V.I.P Member
Posts: 212
Joined: Wed Aug 04, 2010 5:43 am
Full Name: Nick Bush
Company Details: NOVAMECH
Company Position Title: Director
Country: New Zealand
Skype Name: novamech5
Linkedin Profile: Yes
Location: Auckland, New Zealand

Re: Polyworks IAlign help for point cloud registration

Post by NOVAMECH » Fri May 19, 2017 2:16 am

Hi John,

Perhaps we can organize a Team Viewer Call - and I can see what is the problem. PolyWorks is a BEAST and Very Very little knowledge about for the taking. happy to help where I can - But not a super expert.

Next week is good for me.

Kind Regards

Nick Bush
34 Awaroa Stream Drive
Waiuku 2123
Telephone: 00 64 (0) 21 732 052
SKYPE: novamech5

"You miss 100% of the shots you don't take"

User avatar
I have made 50-60 posts
I have made 50-60 posts
Posts: 58
Joined: Sun Mar 30, 2008 6:22 am
Full Name: Nick Herath
Company Details: Lester Franks
Company Position Title: Director
Country: Australia
Linkedin Profile: Yes
Location: Melbourne, Australia

Re: Polyworks IAlign help for point cloud registration

Post by nickherath » Sat May 20, 2017 5:07 am

Polyworks IMAlign is a great tool out of the box for registration of terrestrial scan data and can be enhanced even further if you know a thing or two about macro programming.
The most common problem with excessive RAM usage in Polyworks is due to incorrect import settings. Remember what you see in IMAlign is a representation of the structured point cloud using the interpolation settings to extract and display the point cloud normals. You don't need a ridiculous number of interpolated points to get a good registration.
A few tips are:
- Import your point clouds at 1/4 resolution.
- Ensure you are using Range and Angle interpolation setting which is much more efficient.
- Refine your interpolation settings so the resulting point cloud image is around 1 million interpolated points give or take. Check in properties and refine as necessary.
- Whilst doing your registration, only display the point clouds you need by hiding or ignoring in the treeview and make use of the static/dynamic display to drop the display resolution down if your graphics is starting to slow down. Only turn all the point clouds back on when you are doing your global adjustment.

For any project over 100 scans we prefer to register in Polyworks rather than Cyclone as we find it much faster and more visual to analyse your registration and also works seamlessly with total station survey control.
A laptop with 32GB of RAM can handle 100-200 scans loaded at once quite comfortably, a more powerful computer with 64GB RAM can easily handle 400-500+ loaded at once.

Return to “PolyWorks”