Surf plot mesh looks jagged when I set FaceAlpha

Question

Hongbo Zhao 2018-5-11

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/400376-surf-plot-mesh-looks-jagged-when-i-set-facealpha

编辑： Walter Roberson 2021-8-11

Below is the example given in the "surf" documentation. The mesh looks smooth when `FaceAlpha` is not included but it looks jagged when it's transparent. Is this a graphics card issue or can it somehow be fixed?

 [X,Y] = meshgrid(-5:.5:5);
 Z = Y.*sin(X) - X.*cos(Y);
 s = surf(X,Y,Z,'FaceAlpha',0.5)

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Walter Roberson 2018-5-12

Let me think... You are using r2013b or r2014a or so? If so then there was bug having to do with opengl use, which gets enabled automatically when alpha is used.

Hongbo Zhao 2018-5-12

编辑：Walter Roberson 2021-8-11

I'm actually running it on R2018a. In fact when I try the example in the browser it also looks jagged https://www.mathworks.com/help/matlab/ref/surf.html?s_tid=doc_ta

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Answer 1

Leone Campos 2021-8-10

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/400376-surf-plot-mesh-looks-jagged-when-i-set-facealpha#answer_764532

在 MATLAB Online 中打开

Based on Jan's answer I was able to solve the problem on my PC (Windows 10) using

opengl hardwarebasic

Code

from https://www.mathworks.com/help/matlab/ref/mesh.html

opengl hardwarebasic
% opengl hardware
% opengl software
[X,Y] = meshgrid(-5:.5:5);
Z = Y.*sin(X) - X.*cos(Y);
s = surf(X,Y,Z,'FaceAlpha','0.5')

With software

With hardware

With hardwarebasic

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Hongbo Zhao 2021-8-11

Thank you @Leone Campos This works perfectly for me (windows 10 + R2021a)! We finally have a solution after 3 years. This is in fact very important since you will often want to show the entire surface with the lines still looking good.

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Answer 2

Jan 2018-5-12

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/400376-surf-plot-mesh-looks-jagged-when-i-set-facealpha#answer_319885

在 MATLAB Online 中打开

It looks nice in my Matlab 2016b/Win10. Setting the Alpha blending enables the OpenGL renderer. If this causes troubles, try:

opengl software

Does this help? Do you have the current versions of the drivers installed? Which OS are you using? Can you post a screenshot such that "looks jagged" gets more clear?

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Walter Roberson 2018-5-12

Setting Alpha at all forces OpenGL to be used.

Jan 2018-5-12

编辑：Jan 2018-5-12

@Hongbo Zhao: Thanks for posting the screen shot. This clarifies immediately that this is the expected behavior. Alpha blending works in the OpenGL renderer only, but then the line smoothing is not enabled (for reasons unknown to me).

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