# Showing intersect path correctly in 3D Graphics

Anthony ZeLin Peng shared this question 6 months ago

I created an applet which helps students learn the shape of the cross section by a plane and cylinder several days ago. However, I find a problem that doesn't match reality. Here is the capture image showing the problem

The orange region is the cross section showing by geogebra. I know that if the plane can be extend infinitely, indeed the orange region fits the result showing by geogebra. But I just want to show the region with ticks without region marked red pen, how can I do that? (The reason why I want to do this is that the plane is restricted in blue square).

1

`Arc(e, K_2, K)`

hide e

1

Oh, that is fine. But it marks the inferior arc. How can I show the major arc?

1

Je ne comprends pas, c'est "OK" pour moi (la couleur n'est pas trop belle)

1

Thanks for your advice. I will try to fix the color display problem!!!

2

essaye avec Arc(e, K, K_2)

1

Yeah, you are right! Thanks a lot! I have already work it out!

1

Hi ,Noel Lambert. Here I encouter another problem Plane p is intersected with cylinder at S,M,K_1,K_2. How can I show the region with ticks.