# How do you create a cut on a 3D Rotating Ellipse?

chiarageogebra shared this question 2 weeks ago

I am trying to create 3D rotated ellipse with a vertical cut, as in the file "Ellipse Image".

In the .ggb file you can see the 3D ellipse and two lines.

I'd like to remove the surface on the ellipse given by the space between the two lines that intersect it.

Could anyone please suggest how this could be done with GeoGebra?

Ok the file is on GeogebraTube

here

https://www.geogebra.org/m/jdhyqznu

1

That's possible with https://wiki.geogebra.org/e... I think

1

puedo explicar cómo está hecho en español

1

Thank you!

Se puede acer lo mismo però con la superficie lisa como la de la imagen "Ellipse Image"?

1

Fácilmente cambiando la definición de rho

si lo que quieres es una pared fina pon en rho_0 lo mismo que en rho_1 menos una pequeña cantidad o sea rho_0 debe ser rho_1-0.2 por ejemplo

mira los otros gráficos en polares por ejemplo anima este después de descargarlo

https://www.geogebra.org/m/...

2

Hi

Do you want something like that? See the picture

You must use parametrics curves for the ellipses with limits of the planes ,take the angle into account and connect the two curves with a surface.

See you later

1

Hi.

That's exactly what I am trying to do, thank you!

Could you please send me the file or a screenshot that shows the equations fully, so that I can understand better how to do it?

thanks again

1

Ok the file is on GeogebraTube

here

https://www.geogebra.org/m/jdhyqznu

1

Thank you. Looking at it, the issue is that when you rotate increasing the angle, the position of the opening changes. My aim is to make it stay in the same position. So having a vertical opening on a 3D ellipse that has been rotated. Is it possible create the surface to be eliminated after the rotation, so it stays vertical?

1

Also, what is the command you used to create surface "e"?

1

Fai clic con il tasto destro del mouse su ogni oggetto presente nella costruzione per vedere il relativo comando.

e=Superficie(v a(t + g) + (1 - v) b'(t + d), v, 0, 1, t, d, f π)