Hi Yannada, that is just a display artifact.
In order to display your surface, MoI breaks it into triangles since your video card only knows how to render triangles and not actual NURBS surfaces.
You're able to see kind of the outline of those triangles in this particular case, that's not a particularly unusual thing in areas that have a lot of changing in their curvature. MoI has some stuff in it where it tries to subdivide triangles in those areas to reduce those artifact, but in this case it just did not happen to get divided down small enough, so you can see the triangles.
Like PaQ mentions, if you go to Options / View, you can set the "Mesh angle" parameter to a smaller value, such as 5 degrees which will cause the display mesh to get a larger number of polygons in it and reduce that display artifact.
However, I actually do not recommend that you leave it set there, since a mesh angle of 5 will produce a much much heavier mesh on everything and if you have a large model with many surfaces in it, the display meshes will start to take up a considerable amount of memory, and also it will take longer for the meshes to be calculated.
So basically that is just something to get used to and ignore. If you do want to check it out, then I would recommend to only lower the mesh angle temporarily and make sure to restore it back to the default so that you can handle larger models better.
The default angle is actually pretty small and creates pretty dense meshes already.
- Michael
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