Plane plotted with fimplicit3 fails to render

10 次查看（过去 30 天）
Matt J
Matt J 2024-2-5
评论： Adam Danz 2024-10-7
Ran in:
load data E C ax
planefun=@(x,y,z) E(1)*x+E(2)*y+E(3)*z+E(4);
In the plot below, I successfully plot a point C and try to superimpose, with fimplicit3, the plot of a plane described by planefun. Since C nearly satisfies the plane equation,
planefun(C(1), C(2), C(3))
ans = -2.8422e-14
I think I should be able to see a portion of the plane in the figure (and it should pass through C), but I do not. Why?
plot3(C(1), C(2),C(3),'x'); axis(ax); hold on
fimplicit3(planefun,ax); hold off

请先登录，再回答此问题。

采纳的回答

Matt J
Matt J 2024-2-6
MathWorks Tech Support has classified this as a bug (Case #06788114)
  1 个评论
Adam Danz
Adam Danz 2024-10-7
Thanks for reporting this, @Matt J. As you've discovered in another thread, this bug was fixed in R2024b.

请先登录，再进行评论。

更多回答（1 个）

akshatsood
akshatsood 2024-2-5
Hi @Matt J,
I have noticed that you are experiencing difficulties with the 'fimplicit3' function during plotting. After attempting to replicate the issue, I encountered similar behavior. It appears that the problem stems from the axis limits defined by 'ax'. The 'fimplicit3' function requires an adequate range to properly visualize the surface where f(x,y,z) = 0 intersects the level f=0. In your instance, the provided 'ax' limits were insufficient, preventing the curve from rendering correctly.
Below is the revised code snippet with appropriate adjustments.
load data E C ax
planefun=@(x,y,z) E(1)*x+E(2)*y+E(3)*z+E(4);
plot3(C(1), C(2),C(3),'x','LineWidth',2,'Color','r');
hold on
f = fimplicit3(planefun,[-250 0]);
f.EdgeColor = 'none';
f.FaceAlpha = 0.8;
hold off
Have a look at the following references for a better understanding
https://in.mathworks.com/matlabcentral/answers/2017881-why-fimplicit3-draw-the-same-function-differently
I hope this helps.
  1 个评论
Matt J
Matt J 2024-2-5
编辑：Matt J 2024-2-5
Ran in:
Hi @akshatsood,
I do thank you for undertaking to study this problem. However, I don't think the span of the axes could be the issue. Here is a modified example with the same axis range, except that C has been translated to (0,0,0). The plane renders fine,
load data E C ax
ax=ax-repelem(C',2);
planefun=@(x,y,z) E(1)*x+E(2)*y+E(3)*z;
plot3(0,0,0,'x','LineWidth',2,'Color','r');
hold on
f = fimplicit3(planefun,ax);
f.EdgeColor = 'none';
f.FaceAlpha = 0.8;
hold off

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 2-D and 3-D Plots 的更多信息

标签

产品


版本

R2023b

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by