[vtkusers] TIN to regular mesh

[Marc Huber]

i want to divide objects into polygons (regions) which point in a very 
similiar direction.

I have computed normal vectors for the points of the object.
now i want to extend a method of image processing to 3D.
in an image i'm growing regions with similar color values starting from 
different seed points.
this i want to apply in a changed way to the 3D space
my normal vectors are my "color values" and I want to iterate through 
the 3D space to grow regions.

if i have no regular spacing between the points i might get problems



Am 11.04.2013 16:44, schrieb Bill Lorensen:
> You could create a volume of distances to the triangles. The distance 
> field will have regular spacing in x,y,z but the x,y,z value will be 
> distance to the surface.
>
> Are you trying to compute something? Maybe if we know what the final 
> problem is we can provide some ideas.
>
>
>
> On Thu, Apr 11, 2013 at 8:54 AM, Marc Huber <marchuber.hft at gmx.de 
> <mailto:marchuber.hft at gmx.de>> wrote:
>
>     unfortunatelly not. I need it and hoped that vtk is able to do this.
>     I have to iterate through point clouds with a regular spacing like
>     iterating through pixels of an image. So in fact I don't even need
>     te visualization, just the point cloud extracted from the
>     visualization.
>     thanks for your help
>     Best regards
>     Marc
>     *Gesendet:* Donnerstag, 11. April 2013 um 14:45 Uhr
>
>     *Von:* "Bill Lorensen" <bill.lorensen at gmail.com
>     <mailto:bill.lorensen at gmail.com>>
>     *An:* "Marc Huber" <marchuber.hft at gmx.de
>     <mailto:marchuber.hft at gmx.de>>
>     *Cc:* "VTK Users" <vtkusers at vtk.org <mailto:vtkusers at vtk.org>>
>     *Betreff:* Re: Re: [vtkusers] TIN to regular mesh
>     I don't know of a vtk filter that does this.
>     Do you have a reference for an algorithm that does this?
>     On Thu, Apr 11, 2013 at 8:43 AM, Marc Huber <marchuber.hft at gmx.de
>     <http://marchuber.hft@gmx.de>> wrote:
>
>         Sorry for leaving so much unclear.
>         I have closed volumes e.g. a CAD model of a pipe
>         Best regards
>         Marc Huber
>         *Gesendet:* Donnerstag, 11. April 2013 um 14:22 Uhr
>         *Von:* "Bill Lorensen" <bill.lorensen at gmail.com
>         <http://bill.lorensen@gmail.com>>
>         *An:* "Marc Huber" <marchuber.hft at gmx.de
>         <http://marchuber.hft@gmx.de>>
>         *Cc:* "VTK Users" <vtkusers at vtk.org <http://vtkusers@vtk.org>>
>         *Betreff:* Re: [vtkusers] TIN to regular mesh
>         What source of object is being modeled? Is it a closed volume?
>         An elevation map?
>         On Thu, Apr 11, 2013 at 2:09 AM, Marc Huber
>         <marchuber.hft at gmx.de <http://marchuber.hft@gmx.de>> wrote:
>
>             I need a quad mesh where the point distance in x and y
>             direction is always the same.
>             Best regards
>             Marc
>
>             Am 10.04.2013 um 21:52 schrieb Bill Lorensen
>             <bill.lorensen at gmail.com <http://bill.lorensen@gmail.com>>:
>
>                 What is your definition of "regular mesh"? A regular
>                 triangular mesh is one where each element has 3 edges
>                 and the valence of each interior point is 6. A regular
>                 quad mesh is one where each element has 4 edges and
>                 the valens of interior points is 4.
>
>                 On Wed, Apr 10, 2013 at 11:50 AM, Marc Huber
>                 <marchuber.hft at gmx.de <http://marchuber.hft@gmx.de>>
>                 wrote:
>
>                     Hi,
>                     I have a CAD model, which is triangulated. What
>                     I'd like to do is to create a regular mesh of it.
>                     I already searched in the archives and found out
>                     that it might help to use shepard. I awfully don't
>                     get it managed to solve this problem. Maybe I’m
>                     also just searching with the wrong keywords.
>                     Has maybe somebody some example code for this? (if
>                     c++, tcl, python,... doesn't matter)
>                     I'd be very thankful if anybody could help me.
>                     Best regards
>                     Marc
>
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-- 
Best regards / Mit freundlichen Grüßen
Marc Huber

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