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crop the polygon from the 3D surface

조회 수: 3(최근 30일)
Mammadbaghir Baghirzade
Mammadbaghir Baghirzade 2020년 6월 18일
편집: Mammadbaghir Baghirzade 2020년 11월 10일
Hi all,
I have such an attached 3D surface and a polygon on it. (Code is provided below)
I aim to crop the portion which is only inside the polygon and delete everything outside the polygon.
I found out the function of "inpolygon", but it did not work well enough since it is for 2D.
Then I encountered with "inpolyhedron" which is written for 3D, but was not that successfull on using it.
Is there any other way that you would suggest?
Thank you
Regards
  댓글 수: 2
Mammadbaghir Baghirzade
Mammadbaghir Baghirzade 2020년 6월 18일
Hi Kelly,
Thank you for your reply.
Yes, there are 5 points on the surface and then I joined those points with lines.
So, both of the polygon and the surface are on the same plane.
I've provided the script in the main question part.
Thanks you
Regards

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채택된 답변

darova
darova 2020년 6월 19일
What about this? I just cutted surface in 2d plane
[X1,Y1,Z1] = sph2cart(llambda1,pphi1,6.9);
surf(X1,Y1,Z1)
in = inpolygon(X1,Y1,xl1,yl1);
view(3);
hold on
plot3(X1(in),Y1(in),Z1(in),'.r')
plot3(xl1, yl1, zl1,'MarkerSize',14, 'Color','red')
axis vis3d
  댓글 수: 4
Mammadbaghir Baghirzade
Mammadbaghir Baghirzade 2020년 6월 19일
Hi Kelly,
Thanks for your explanations, I understand.
Do you know how can I connect those points (vertices of a polygon) with an arc instead of a line.
I mean , now I understand better what you meant by asking if the surface and the polygon are on the same plane or not.
Atually I want to crop the portion which looks like a polygon from the surface, so I need to have the curvature.
In this case, I assume there is not a curvature, do you agree with me?
Thanks
Regards

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추가 답변(1개)

darova
darova 2020년 6월 20일
Here is another idea using triangulation (initmesh)
  • create polygon
  • use initmesh to triangulate it
  • calculate Z coordinate
  • rotate the object
  댓글 수: 5
darova
darova 2020년 6월 22일

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