Green triangles on pre-edited meshes

[[Br...]]

Hello,

I am noticing a difference in the mesh appearance when I upload it after a pre-trimming operation (in Meshmixer). It shows some green triangles whether it is set as CAD or as a mesh. In the CAD view, it also displays the same red edges when I activate the boundary lines. Could someone shed some light on what this represents? Is it a defect inherent to exporting after editing in another software? Is there a correction procedure I should apply in these cases? If so, could it modify the surface? My goal is to compare how one mesh is distorted relative to another, so I am concerned that applying such procedures might affect the results. 

[[Na...]]

Hello Bruna,

I am not sure, how the green triangles are displayed, maybe you could post a screenshot?

A description of different mesh errors is in the article of this function, which you could apply to your mesh: https://techguide.zeiss.com/en/zeiss-inspect-2025/article/cmd_mesh_eliminate_mesh_errors.html

[[Br...]]

Hi Nanno,

Thank you so much for your reply and link provided.

It follows an example. They are not shown if I upload the raw file, without pre-trimming. They also remain showing after applying the 3D comparison.

Could it fall into Fanfolded triangles category? 

I tried to repair it however it encompassed a large area, more that I would like to modify.

Edited November 23, 2025

[[Ma...]]

For me it looks like either hole ( missing triangle ) or inverted face of that triangle.

[[Na...]]

They look like inverted (standard color of mesh rear side). It should be possible to fixed with this function: ZEISS Quality Tech Guide

[[Br...]]

Hi Martin and Nanno,

I am truly grateful for your help in clarifying what those triangles were and for the very useful link you, Nanno, provided.

Since my mesh had many small green (inverted) triangles, I found this tool in the same context of the link above, which was extremely helpful for orienting all of them at once. https://techguide.zeiss.com/en/zeiss-inspect-2025/article/cmd_mesh_automatically_orient_selected_normals.html

Once again, thank you both very much

[[Na...]]

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Hi Bruna, I just realized I posted the wrong link - it was supposed to be the one from your post...