Strange small dark areas on the surface

Question

I exported a plot of 3d surface from Maple to .x3d file, then used Meshlab to create from it a .stl file. And finally I tried to use "Solidify" tool of Blender to make the surface 0.02 thick. Here's what I got:

Is this normal view? I mean do a lot of small dark areas look normal, provided that the original surface is smooth? If not, then how can I correct it.

It seems, that recalculating normals solved the problem! Here's what it looked like after it.

Those aren't normal; probably flipped normals seen through because of z-fighting. Include a screenshot of the mesh before solidifying. Related - http://blender.stackexchange.com/questions/5441/cause-of-black-artifacts-in-render — Mr Zak, Oct 10 '16 at 20:43

score 0 · Accepted Answer · answered Oct 10 '16 at 20:58

0

This is most likely caused by incorrect normals. In order to correct this, go into edit mode, select all the faces, and click on Shading->Normals->Recalculate.

answered Oct 10 '16 at 20:58

krypticbit

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Thank you, it seems, this solved the problem. I included image of the result in my first message. – Andrei Petrov Oct 10 '16 at 21:16
If this solved your problem, please accept / upvote the answer. I'm glad I could help. – krypticbit Oct 10 '16 at 21:17
I accepted it, but upvoting doesn't work, because I have reputation less than 15... – Andrei Petrov Oct 10 '16 at 21:23
@AndreiPetrov - also be sure to hit "W" and then "A" in edit mode and select "Remove Doubles". – metaphor_set Oct 10 '16 at 21:51

Strange small dark areas on the surface

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