Rendering artefacts

Hi, all!

I hope this is the good place to post such a question; if not, sorry about that.

Here it is: L2AV and L2AV.003 are the two sides of a boat’s bridge girder. As far as I can see, they are correctly oriented : L2AV’s face normals point out of the geometry, L2AV.003’s point inside. None of the two meshes is flagged as “Double Sided”.

Yet when they are rendered, hideous artefacts appear.

Thanks for your help,


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Overlapping faces causes the artifacts, face normal direction will not make any difference, the faces are still in the same place.

Why do you need separate object for each side ?

I tried to merge the two objects and remove doubles, there wasn’t any difference :frowning:

Why do you need separate objects fro front and back ?

If you do then the front and back faces cannot be in the same position.

Very interesting, exactly what I was looking for :). But, may I know how you got this result? A teeny weeny bit of offset, perhaps?
Thanks in advance,