help to sovle this ugly render looking

as you can see from the picture, there seems that the inner is not a flat face. But I have make all the vertex have the same z-coordinate, removed the doubles, and have done ctrl+n

so what is the problem? thank you in advance

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ruan.blend (226 KB)

if you want us to be able to give you any decent kind of an answer, you have to show us the wireframe of the model :yes:

It’s the long skinny triangles. Their causing the distorted shading.

It because you are using a subsurf modifier and you also have triangles, the two don’t mix so well. It’s best to make everything out of quads. I tried to switch those triangles to quads, but it didn’t help much. Anyhow, I did add an edge loop around the bottom and that cleared up the problem. Edge split modifier might have fixed it too.

Randy

Attachments

ruan.blend (226 KB)

thanks :slight_smile:
is this common in 3d softwares?

Yes. Yes it is. Some programs have N-gons, blender will soon with Bmesh. But you should avoid triangles in all packages, whenever possible.