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Resolution of geometry and/or an stl mesh

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Resolution of geometry and/or an stl mesh

Posted by Petri Majander at June 02. 2012

Hello,

sometimes the geometrical object, typically a circle or a cylinder seems to have a coarse resolution. As the stl mesh is exported

the result is not a circle but rather a polygon.

In Salome is there a way to adjust the resolution  of

a) a geometric objects   ?

b) an exported stl mesh   ?

BR

Petri

 

Re: Resolution of geometry and/or an stl mesh

Posted by Saint Michael at June 04. 2012

Hi Petri

You can adjust resolution of a geometric object (pop-up in Viewer / Deflection Coefficients) but this influences visualization only and doesn't influence resolution of STL export.

St.Michael

Re: Resolution of geometry and/or an stl mesh

Posted by Petri Majander at June 04. 2012

Hi Michael

it seems to me that the accuracy representation is somewhat arbitrary. A cylinder has an OK accuracy, after partitioning  and exploding a ring out of it I get a coarse polygon. There must be some way to deal with this. The visualization is irrelevant, I need to get smooth surfaces for meshing.

Petri 

Re: Resolution of geometry and/or an stl mesh

Posted by Saint Michael at June 04. 2012

A cylinder has an OK accuracy, after partitioning  and exploding a ring out of it I get a coarse polygon.

Why do you bother about a separate ring, as you can't export the ring into STL, you can export the whole surface only?

I need to get smooth surfaces for meshing.

Why then you you use STL, why not STEP or IGES?

Re: Resolution of geometry and/or an stl mesh

Posted by Petri Majander at June 04. 2012

Previously Saint Michael wrote:

A cylinder has an OK accuracy, after partitioning  and exploding a ring out of it I get a coarse polygon.

Why do you bother about a separate ring, as you can't export the ring into STL, you can export the whole surface only?

 

I can export any geometric object separately, try it yourself.


I need to get smooth surfaces for meshing.

Why then you you use STL, why not STEP or IGES?

 

The mesh generators I use require stl (or similar mesh). None of the ones I use import iges/stp.

 

Re: Resolution of geometry and/or an stl mesh

Posted by Saint Michael at June 04. 2012

I can export any geometric object separately, try it yourself.

Yes, use can but a result file is empty in case of an edge or wire.

St.Michael

Re: Resolution of geometry and/or an stl mesh

Posted by Malik H at April 23. 2013

HI,

I have quite the same problem.

I am trying to generate an stl file of an airfoil with salome that I can use in a CFD software.

However, my stl file is really light ! The surface is represented by only 20 triangles. As a result I have a castellated stl surface with provokes some problems with the flow.

How can I improve the resolution of the stl file ?

You can find enclosed my hdf case.

Thank you for your help.

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Re: Resolution of geometry and/or an stl mesh

Posted by Saint Michael at April 24. 2013

Hi Malik

Compute the mesh I have created in your study and export it into STL file. It is more refined.

St.Michael

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