Grozeaion.com CATIA functions (FAQ)

[DanielMadureira]

Hi,

Anyone managed to use some of these functions?

http://www.grozeaion.com/catia/v5-programming/112-useful-catia-vba-functions

If so, which?

I've been trying to learn a bit more about bezier curves, and there are two functions to approximate curves to cubic and quadratic bezier curves.

Anyone could share some knowledge about these particular catia functions of the said website?

There also seem to be missing the code for a function called LLDistance...

Thanks for the help!

 

[TiagoFigueiredo]

What are you trying to do?

Never used it before. And I didn't found anything in chm help file.

Tiago Figueiredo
Tooling Engineer

Youtube channel:

https://www.youtube.com/channel/UC1qdlBeJJEgMgpPLVJoOIOw

 

[DanielMadureira]

Basically i'm trying to get a section of a surface, and try to improve the curvature for G1 and G2 continuity of those sections.

Sometimes I need to correct surfaces that have some "waviness" on them, barely noticeable to the naked eye.

But once you check them with the Porcupine analysis tool in CATIA, all the problems pop up.

Cubic and Quadratic Bezier curves seem the way to go, i'm just trying to find a way to convert a simple NURBS curve in CATIA to a properly mathematicaly defined curve.

Then redo the skin based on those new curves.

Problem is, sometimes I can have hundreds of sections that need to be corrected. That's why i'm investigating the VBA route.

Clear as mud?

PS: és português Tiago?

 

[TiagoFigueiredo]

Olá Daniel, Sim sou Português.

What you are trying to do, is somewhat interesting. But looks really hard to implement, Being honest i don't know from where to start. But it's an interesting function that sometimes i need in my designs.

Tiago Figueiredo
Tooling Engineer

Youtube channel:

https://www.youtube.com/channel/UC1qdlBeJJEgMgpPLVJoOIOw

 

[DanielMadureira]

Sempre um prazer ver outros "tugas" por aqui, apesar de termos o Atlantico entre nos...

Anywhow, I think I've found something.

In the Freestyle module, there's something called "Converter Wizard".

With this function you can convert curves and even surfaces to simplified versions. Meaning, you can control tolerance, order (from 2 to 16) and segmentation.

Of course the question is always how much variation is acceptable.

I read once that to have good surfaces you need good curves, and to have good curves you need good points.

The next step would be extracting points from a curve, and "correct" each of the points coordinates to the closest correct equation for a cubic, quadratic, etc B-Spline.

I'm really going into uncharted territory, so if anyone wants to chime in...by all means do!

 

[TiagoFigueiredo]

Os "Tugas" estão espalhados por todo o lado.

Don't knew this function. I have learned something today thanks to you. It looks quite interesting.

Tiago Figueiredo
Tooling Engineer

Youtube channel:

https://www.youtube.com/channel/UC1qdlBeJJEgMgpPLVJoOIOw