Topic: Will the Math Geniuses Help a Poor Schmuck Like Me?

[nobody]

I need to get estimated normal values for points in a point cloud.  Specifically estimated from covariance analysis. 

What I'd like to do is demonstrated here:

http://pointclouds.org/documentation/tutorials/normal_estimation.php#normal-estimation

This is beyond me and my skills so I'm begging for anyone's help.

The estimated normal values would be used to help process LIDAR data.

Thanks!

[Gasty]

Hi,

This is not the kind of problem Autolisp is suited for, I think this should be programmed in C# or even in C++ as involve massive calculations,  point clouds have usually millions of points. Any way in this forum look at: http://www.theswamp.org/index.php?topic=43453.msg487472#msg487472, do a performance test calculating eigenvalues/eigenvectors and check if it's suited to your purpose.

Gaston Nunez

 

[dgorsman]

Indeed.  The newer AutoCAD releases have point cloud tools available through the API.

[nobody]

Hey Gasty, I'll be pre-processing and extracting the data I need to reduce the points considerably.   As far as the performance test I'm not sure how that applies as a solution.  I'll post the same question in .Net forum (though I believe duplicates are discouraged).

Hi,

This is not the kind of problem Autolisp is suited for, I think this should be programmed in C# or even in C++ as involve massive calculations,  point clouds have usually millions of points. Any way in this forum look at: http://www.theswamp.org/index.php?topic=43453.msg487472#msg487472, do a performance test calculating eigenvalues/eigenvectors and check if it's suited to your purpose.

Gaston Nunez

 

[nobody]

Indeed.  The newer AutoCAD releases have point cloud tools available through the API.

Thanks Dgorsman. I hadn't considered that.... I'll have to dive in... appreciate the suggestion