Fix example mesh_3D_gray_vtk_image

[ange-clement]

Summary of Changes

Fixes example mesh_3D_gray_vtk_image.
Changed : Meshing all value under isovalue --> Meshing all values over isovalue.

Release Management

• Affected package(s): Mesh_3
• Issue(s) solved (if any):
• Feature/Small Feature (if any): n/a
• License and copyright ownership: no change

[janetournois]

Using Less or More actually depends on the input data.
Using More is the default behavior when using isovalue only, and using Less gives another example. This should be better documented

[sloriot]

Successfully tested in CGAL-6.0-Ic-122

[lrineau]

@janetournois @ange-clement As far as I understand, that pull-request is debated. I will not merge it, even if it was tested successfully.

[sloriot]

@janetournois what is the status of this PR?

[janetournois]

This modifies the example of Mesh_3 to make it work with different data sets, and it does not bring any new info or feature, so imho it can be closed.

[sloriot]

What about adding an option in the parameter to pick less or more?

[janetournois]

Good idea @sloriot !
However meshing this data will fail with less=false

[sloriot]

Good idea @sloriot ! However meshing this data will fail with less=false

which is why the default is true

[sloriot]

Successfully tested in CGAL 6.1-Ic-14