why nonuniform mesh produced

[Hathaway K]

hi,all, 

 I used surf2mesh, and my mesh result is nonuniform like the fig above, does this happen often?  I've tried to change the parameter like keepratio and maxvol, the result has not changed, I have no idea why this happens,  could you please tell me why or something I can refer to?

thanks 

[Qianqian Fang]

the non-uniformity of the output mesh comes from your input surface. if your input surface has small features, such as small gaps or sharp turns, surf2mesh/tetgen will need to refine the mesh near those small features in order to satisfy the default mesh quality requirement.

if you need help to further understand this, please share data and script (if the data is bigger than 1 MB, please do not attach the data file directly, instead, use an external link such as a dropbox, google drive or one-drive link).

On 3/19/23 10:46, Hathaway K wrote:

hi,all, 

 I used surf2mesh, and my mesh result is nonuniform like the fig above, does this happen often?  I've tried to change the parameter like keepratio and maxvol, the result has not changed, I have no idea why this happens,  could you please tell me why or something I can refer to?

thanks 

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[Hathaway K]

Professor, thank you for your kind reply, I attach the relevant documents below. By the way, the data is abtained from a 3D object, which is generated by ratation.

link

[Qianqian Fang]

did you read my last reply? have you checked your input surface?

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[Hathaway K]

I checked input, I can plot it .I don't know how to distinguish whether it's right or wrong, it looks fine from the picture..

[Hathaway K]

Thank you for your patience, Professor Fang,  and sorry for my careless. I've realized  I made a mistake, then I changed my input file OFF-formatted, and I got a nice mesh.

Next step, I used mmclab to run simulation, but I got an erro "Unrecognized function or variable' mmcraytrace'”.

Also, when I run the demo ”demo_mmclab_slit.m", erro""Unrecognized function or variable' mmcsrcdomain'" occurred.

I've set MCX /MCXLAB/MMC/MMCLAB in MATLAB path, I'm wondering if you would have an idea about what's causing those erro or there's something incorrect about the mesh.

I attached my new script file.

Any help provided would be greatly appreciated.

link

[Qianqian Fang]

On 3/21/23 09:50, Hathaway K wrote:

Thank you for your patience, Professor Fang,  and sorry for my careless. I've realized  I made a mistake, then I changed my input file OFF-formatted, and I got a nice mesh.

Next step, I used mmclab to run simulation, but I got an erro "Unrecognized function or variable' mmcraytrace'”.

Also, when I run the demo ”demo_mmclab_slit.m", erro""Unrecognized function or variable' mmcsrcdomain'" occurred.

I've set MCX /MCXLAB/MMC/MMCLAB in MATLAB path, I'm wondering if you would have an idea about what's causing those erro or there's something incorrect about the mesh.

these missing functions are located under mmc/matlab folder, you need to add path accordingly. see

https://github.com/fangq/mmc/blob/master/matlab/mmcraytrace.m
https://github.com/fangq/mmc/blob/master/matlab/mmcsrcdomain.m

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[Hathaway K]

Thank you very much, Professor Fang, I solved the erro report, but another situation occurred, my programs ran for more than 5 minutes and I stopped it. What can make the program run faster? Or is there something I set incorrect caused that?

This is where it got stuck, see file

Please tell me why it happens and how it can be fixed. 

Best regards.