Moiré patterns in viewport but not in render?

Question

When rendering overlapping meshes (I know this is bad practice, but in this case it is done purely out of curiosity) You get strange artifacts.

However, these differ from the viewport render and the F12 render:

Here is a screenshot of the viewport render in camera view:

enter image description here

And here is the render:

enter image description here

Why are these different?

kivig · Accepted Answer · 2013-11-14 23:32:48Z

3

Rendering has higher sampling per pixel, hence the precision, diminishing visible moire.

answered Nov 14 '13 at 23:32

kivig

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$\begingroup$ I rendered them with the same number of samples though. $\endgroup$ – gandalf3♦ Nov 14 '13 at 23:34
$\begingroup$ Cycles? There could be differences in clipping for instance, resulting in different precision, not sure though. $\endgroup$ – kivig Nov 14 '13 at 23:38
$\begingroup$ Related: blender.stackexchange.com/a/2730/599 $\endgroup$ – gandalf3♦ Nov 15 '13 at 2:42

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