CGAL users discussion list

["Sebastien Loriot (GeometryFactory)" <>]

Your input point cloud is basically a grid of points in a plane.
I don't know what you expect as output but poisson reconstruction
algorithm is probably not the right tool for that task (Advancing front
seems more appropriate to me).

You should read the new tutorial written by Simon Giraudot about
reconstruction available here:

https://cgal.geometryfactory.com/CGAL/doc/master/Manual/tuto_reconstruction.html

Best regards,

Sebastien.

On 9/7/20 8:28 PM, sindhu r ( via cgal-discuss 
Mailing List) wrote:
> Hello,
> I am trying to do the following:
>
>  1. define a set of 3d coordinates describing a surface
>  2. compute and orient normals
>  3. generate a polyhedral mesh and save it to a .off file for further use.
>
> What I have done so far: I have accomplished all 3, however my 
> polyhedral mesh and my .off file seem incorrect.
>
> My .off file (attached) was generated using the points and normals from 
> a .xyz file (also attached). The xyz file represents points that span 
> the x-y plane 0 <= (x,y) <= 6, and 0 <= rand(z) <= 0.2. It does not have 
> any holes or islands; it looks like a blanket. My final test case will 
> involve holes and/or islands, but for the moment even this simple 
> example shows something strange about the .off file that I generate 
> using the Poisson reconstruction method.
>
> While the .xyz file contains points respecting the 0 <= (x,y) <= 6, and 
> 0 <= rand(z) <= 0.2 condition, my .off file seems (lines 4, 7, 8 etc..) 
> to have vertices with x,y,z locations that are way off my points 
> specified in the .xyz file. I think I'm using the Poisson reconstruction 
> incorrectly (minimal working code attached). The image of the polyhedral 
> mesh (attached) does not remotely resemble what I hoped for :(.
>
> I'm sorry if it is a basic question, and I would be grateful for any 
> guidance. Thank you!
>
> Regards,
> Sindhu R
>
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