Mining Tunnel Sample Data

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landmeterbeuckx
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Re: Mining Tunnel Sample Data

Post by landmeterbeuckx » Fri Aug 05, 2016 1:31 pm

LSBbvba
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Re: Mining Tunnel Sample Data

Post by jekub » Sat Aug 06, 2016 5:31 pm

At last!!!!!!!!! Sorry, next time I'll upload the data first.
https://dl.dropboxusercontent.com/u/18030867/tunnel.zip

Yesterday I tried with wetransfer but it was swapping between 0% and 1% all the time, I never know that a progress bar could go backwards :lol:

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Re: Mining Tunnel Sample Data

Post by dhirota » Sun Aug 07, 2016 1:01 am

Jekub

Thank you for the tunnel data.

I loaded the 24 XYZ files into Sequoia 1.1RC; created the point cloud for the 24 scans; and generated the mesh for 2 out of 24 scans.
8-6-2016 1-23-55 PM.jpg
8-6-2016 1-26-48 PM.jpg
8-6-2016 1-29-05 PM.jpg
Estimated total points 24 X 200,000=4.8M points
Estimated total faces 24 X400,000=9.6M faces
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Re: Mining Tunnel Sample Data

Post by Alex@Marcum » Mon Aug 08, 2016 2:50 pm

Thank You Jekub! I will have a look at them today, Sequoia looks amazing I may have to check that out.

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Re: Mining Tunnel Sample Data

Post by dhirota » Mon Aug 08, 2016 3:35 pm

I used Sequoia 1.1RC to create the meshes of 2 scans in a few minutes since I did not have to register the 24 scans. I probably could have completed the 24 meshes in less than 10 minutes, but decided to show the point clouds plus 2 meshes. Below is the thread on LSF by Ian Fraser of Thinkbox/Sequoia.

http://www.laserscanningforum.com/forum ... 68&t=10717
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Re: Mining Tunnel Sample Data

Post by Matt Young » Mon Aug 08, 2016 4:00 pm

dhirota wrote:Jekub

Thank you for the tunnel data.

I loaded the 24 XYZ files into Sequoia 1.1RC; created the point cloud for the 24 scans; and generated the mesh for 2 out of 24 scans.
8-6-2016 1-23-55 PM.jpg
8-6-2016 1-26-48 PM.jpg
8-6-2016 1-29-05 PM.jpg
Estimated total points 24 X 200,000=4.8M points
Estimated total faces 24 X400,000=9.6M faces
Looks like a strange rounding off effect on the edges of the mesh?

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Re: Mining Tunnel Sample Data

Post by jedfrechette » Mon Aug 08, 2016 5:38 pm

Matt Young wrote:Looks like a strange rounding off effect on the edges of the mesh?
This is my main complaint with the meshing algorithm they're currently using. In order to get a continuous surface, you often need to make the sampling distance so large that you get a very soft mesh. The problem is especially bad for concave corners, e.g. the intersections of walls.
Jed

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Re: Mining Tunnel Sample Data

Post by mwiebe » Tue Aug 09, 2016 12:54 am

The rounding effect at the edge of the mesh can be changed, but is the default look of Sequoia's meshing approach which wraps a surface around the points according to a meshing radius. I've grabbed this point cloud and tried a few things to show some differences, thanks for uploading the data set!

Here's a section meshed at 8cm meshing radius with 'Conform to Points' post-processing enabled:
tunnel_8cm_conform.png
If I increase the meshing radius to 15cm, it fills in some of the gaps, but the whole thing is smoother:
tunnel_15cm_conform.png
For comparison, with conform off at this meshing radius, the rounding effect is quite strong:
tunnel_15cm_no_conform.png
Jed is right that the meshing algorithm won't be able to capture a sharp edge or corner without having some roundness related to the meshing radius, but this is a trade-off that comes in exchange for other benefits including the speed of meshing, handling large data sets, and being able to produce something reasonable from fairly complex objects without too much effort. We've got ideas about how to better deal with the varying and anisotropic point densities, corners, etc. in our meshing algorithm, and are continually improving Sequoia as a whole.

Thanks,
Mark
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Matt Young
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Re: Mining Tunnel Sample Data

Post by Matt Young » Tue Aug 09, 2016 8:13 am

My only concern about the rounding effect is that it is changing the result. In other words it's a kind of untruth and does not inspire confidence in the results. Of course, I have not used the software and this is only an observation. The first screen shot in the last set of images looks a lot better.

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Re: Mining Tunnel Sample Data

Post by jekub » Thu Sep 01, 2016 11:31 am

In a few days I'm going to delete the tunnel data file to free some dropbox space.

If you are interested download it now.

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