CGAL users discussion list

[xihongshidelove666 <>]

hey,

    actually you can get the surface normals from the point cloud using some method if you really want to use poisson reconstruction , you can find them in open meshlib .or you can just use alphashape to complete the project,then you neednt the surface normals ,just coordinates is ok . but alpha shape is not so good when dealing with quickly sunk surfaces. if the surface are smoothing or convex ,the result of alpha shape is very good ,however the coordinates should be accurate or in your toleration. 

在2009-08-15，"Indika Tantrigoda" <> 写道：

He,
Thanks for the reply. I'll have a look at chapter 34. I did however go through the link you mentioned.
The problem is that the methods given in the link such as Possion surface reconstruction and using Octrees require
the surface normals. But these are not available, only the x,y,z co-ordinates of the points which forms the point cloud.

Is there any method that can be used when the surface normals are not present to construct a mesh ???

Regards,
Indika
 

2009/8/14 Bo Zhou <>

Indika Tantrigoda wrote:

Hello,
I am in the middle of a research where I try to reconstruct a 3D model based on photographs.
So far I am able to obtain a sparse point could containing the points of the object. I have developed a point cloud
viewer in XNA to view this point cloud data.
What I would like to do is to generate a dense 3D model based on this point could. Would this be possible with CGAL, if so
any advice would be very much appreciated.
I recently found out about CGAL and my knowledge in using CGAL is very minimal (non actually).

Thanks in advance.

Regards,
indika

Hi,

It seems that you want to reconstruct mesh from point cloud, you could have a look at

*Chapter 34 3D Alpha Shapes*

or
to find some useful implementation here

http://www.cs.jhu.edu/~misha/Code/

Thanks.

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