Area evaluation of a generic section

[Mr. Simone Bigalli 0]

Hi,

I have a question about the evaluation of the area of a generic section.

 

I would like to know if it is possible to extract the global area of a closed B-Spline using the command section.getArea. I tried to obtain this for a generic section I'm working on. However, when I did so, I obtained zero as a result.

 

Thanks.

 

Simone

[Jörg 29]

Hi Simone,

 

This should be possible. Can you submit the example that did not work?

[Mr. Simone Bigalli 0]

Hi Joerg,

I attached an example of the file Caeses I'm working on.

 

This is the script:

 

// **********************************************************************

// Autogenerated by CAESES 4.3.1

// Date: mar set 4 2018

// **********************************************************************

 

bsplinecurve c1()

ellipse c2()

point p1()

point p2()

point p3()

point p4()

point p5()

point p6()

 

// **********************************************************************

 

c1.setWeights([1, 1, 1, 1, 1, 1, 1])

c1.setKnotvector([0, 0, 0, 0, 0.25, 0.5, 0.75, 1, 1, 1, 1])

c1.setPL([p1, p6, p3, p2, p4, p5, p1])

c1.setMappingValue("torsion")

c2.setConstantAngleSpeed(false)

c2.setAxisB(1.832)

p1.setX(1)

p2.setX(-1)

p3.setX(-0.82)

p3.setY(2)

p4.setX(-0.82)

p4.setY(-2)

p5.setX(0.82)

p5.setY(-2)

p6.setX(0.82)

p6.setY(2)

 

point p(0, c2.getArea(0, 0, -1, 1), 0)

point r(0, c1.getArea(0, 0, 0, 1), 0)

 

Thank you very much for your reply.

 

Simone.

 

Example_bsplinecurve_Prove.fdbc

[Jörg 29]

Hi,

 

From what I can see you have chosen the wrong plane. Your curves are modeled in the XY-plane so the normal is Z (ID=2). 

[Mr. Simone Bigalli 0]

Hi Joerg,

thank you very much for your assistance. Now all seems to be ok.

 

However I have another doubt. Do you have any idea on why in the example I attached on I was not be able to calculate the area of the B-Spline c1 using the wrong plane but I was able to evaluate in the correct manner the area of the ellipse c2? In fact, yesterday I didn't understand why, using the same settings, I was able to calculate the correct area for the ellipse but I was not be able to obtain the same result for the B-spline.

 

Thank you very much for your reply.

 

Simone

[Jörg 29]

Hi Simone,

 

That's a good question, and we have to take a closer look at it (probably, not intended rather a fallback). But at any rate you should always take care that the normal axis is correct. I understand why you struggled if one version works and the other one does not. 

[Mr. Simone Bigalli 0]

Hi Joerg,

I understand. Thank you very much for your answers and for the assistance to solve my problem.

 

Cheers.

Simone