Polyworks IAlign help for point cloud registration
-
- I have made 10-20 posts
- Posts: 17
- Joined: Tue Jun 29, 2010 3:01 pm
- 13
- 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
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.
- NOVAMECH
- V.I.P Member
- Posts: 279
- Joined: Wed Aug 04, 2010 5:43 am
- 13
- Full Name: Nick Bush
- Company Details: NOVAMECH
- Company Position Title: Director
- Country: New Zealand
- Skype Name: novamech5
- Linkedin Profile: Yes
- Location: Auckland, New Zealand
- Has thanked: 9 times
- Been thanked: 9 times
- Contact:
Re: Polyworks IAlign help for point cloud registration
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
NOVAMECH
34 Awaroa Stream Drive
Waiuku 2123
NEW ZEALAND
Telephone: 00 64 (0) 21 732 052
www.novamech.co.nz
SKYPE: novamech5
"You miss 100% of the shots you don't take"
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
NOVAMECH
34 Awaroa Stream Drive
Waiuku 2123
NEW ZEALAND
Telephone: 00 64 (0) 21 732 052
www.novamech.co.nz
SKYPE: novamech5
"You miss 100% of the shots you don't take"
- nickherath
- I have made 60-70 posts
- Posts: 63
- Joined: Sun Mar 30, 2008 6:22 am
- 16
- Full Name: Nick Herath
- Company Details: Veris
- Company Position Title: Principal
- Country: Australia
- Linkedin Profile: Yes
- Location: Melbourne, Australia
- Been thanked: 1 time
- Contact:
Re: Polyworks IAlign help for point cloud registration
John,
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.
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.