Plane plotted with fimplicit3 fails to render

2 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 Surface and Mesh 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