Properties
Similar Topics
Statistics
Comments
2
Participants
2
Subscribers
2
Votes
1
Views
617
Share
Line style for parts of an ellipse
Answered
Hey everyone,
I am currently trying to reproduce a figure that is presented in this paper. I created a sphere as a 3d figure and projected it onto a 2d plane (see attachment). Now I want to change the line style of the "invisible" part of the 2d projection to make it look similar to the 3d case. The paper tells me to use the intersection tool but I have no idea how that helps me to proceed. Any help is greatly appreciated.
Cheers,
Joscha
Files:
Sphere.png
 GeoGebra
 Help
 Partners

Contact us
 Feedback & Questions
 This email address is being protected from spambots. You need JavaScript enabled to view it.
 +43 677 6137 2693
© 2022 International GeoGebra Institute
change style of ellipse to doted
place 2 point on ellipse
create Arc(<ellipse>,<point1>,<point2>)
adjust the 2 points to the "horizont"
see red sample in attachment
So I came up with a working but rather unsatisfying solution that involves splines. One can just add a few points along the projected circles and then use two splines to recreate the visible and "invisible" sections. It is however quite tedious and time consuming. I also noticed that the "Section( <conic>, P1,P2)" command does pretty much what I need.
Is there a possibility to redraw the curves like the "Section" command does without actually enclosing the defined section (something similar to the Circumcircular Arc command just for conic)? If it is possible, how do I do it? I attached my .ggb file if someone wants to take a look.
change style of ellipse to doted
place 2 point on ellipse
create Arc(<ellipse>,<point1>,<point2>)
adjust the 2 points to the "horizont"
see red sample in attachment
Comments have been locked on this page!