Surface simplification

[margntou]

Hi all. I am having an issue in simplifying a surface. I used the multi-section command to create the surface (it passes from 30 different splines) and it consists of many thin areas (many edges) that I want to get rid off. I have tried several things such as the rough offset tool, disassemble the surface and use from the healing assistant workbench the surface checker tool and the surface connection checker, healing, join, almost everything. My main problem is that I want to automate the process so that it will run for different surfaces. I cannot use the rough offset tool cause it is unpredictable and changes the surface, also it cannot be automated. The two checkers cannot be automated also and the healing if I give a big value in merging distance it creates overlaps. Any further ideas will be great. Thanks a lot.

 

[margntou]

Just to make clear that I am working in Catia V5R19

 

[rstupplebeen]

If we knew more about your geometry we may be able to help avoid the need for surface simplification. Posting images or models will be helpful in helping you out. Thank you.

Rob Stupplebeen

http://www.optimaldevice.com

https://sites.google.com/site/robertkstupplebeen/

 

[margntou]

I hope the image will help. Thanks

 

[rstupplebeen]

Is the issue that the geometry is bad, there are too many segments and it looks bad or is it downstream FEA or other process that's the issue?

Is each profile created with arc segments? Could you use a spline instead?

I hope this helps.

Rob Stupplebeen

http://www.optimaldevice.com

https://sites.google.com/site/robertkstupplebeen/

 

[itsmyjob]

I'd rather spend some time cleaning the curve than trying to fix the surface.

use the smooth curve option and simplify each section so they have a minimum number of vertices then do your multi section surface.

A closed curve will have a minimum of 2 vertices, you can work your curves so vertices are 'aligned' one curve from another, this will make your multi section surface easier.

in order to aligned vertices you can try the following:

split each section with the same plane/surface
smooth each side of a section removing all unwanted vertices.
join each side back together, resulting in a closed curve with 'positioned' vertices
create multi section surface using option to match section's vertices

Eric N.
indocti discant et ament meminisse periti ​

 

[margntou]

First of all I want to thank you both for your answers. This surface was created from several splines which were also smoothed. I used a maximum deviation of 0.5mm and a curvature continuity. In the extremities I used Point as a Start and Tangency as End in order to remove some points and minimize discontinuities. I don't know if there is another way to remove vertices. My main goal is to automate the surface creation process cause every time I have different splines to work with, so I am not in position to manually remove points or simplify things. If for example I use the multi section surface for 10 of the splines and not all of them with a 0.01mm in deviation, the surface is perfect, only two edges. When I insert more splines the result is the one presented in the image. I have already tried the way that itsmyjob mentions, by creating a plane that cuts the splines in half and then multi section surface each one of the areas with a deviation value of 0.01 and the result is much much better. I was just hoping in a faster way for my script but at least I have a "serious" result now.

Thanks a lot again for your time and your ideas.