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Basic Noob Question

Posted: Fri Feb 16, 2007 2:40 pm
by gray_
With the default install of Blender, I create a new scene. Up pops the cube.

I select the cube, duplicate it and rotate the duplicate 45 degrees about the Y axis (forming a kind of star shape). Then I hit F12 to render.

Image

Why do I see a load of corruption on the top of the rendered shape?

- Gray

Posted: Fri Feb 16, 2007 2:54 pm
by Caronte
You need to scale one cube a bit ;)

Posted: Fri Feb 16, 2007 6:05 pm
by qwequ777
the render engine does not know which face is on top of the other.
on some places it happens to be the first, on others it is the second one I think
even if they are exactly at the same place, at the 7th number after the comma they might be a little bit different
and you get the speckles because one plane casts a shadow on the other one

at least I think so :)

solution: see above post

Posted: Fri Feb 16, 2007 7:00 pm
by kitsu
This is indeed caused by "coincident surfaces" and will render similarly in most renderers.

Posted: Mon Feb 19, 2007 3:08 pm
by gray_
Thanks guys.

I also found that creating a single mesh using Boolean->Union solves this problem too.

- Gray