Edouard schrieb:
> 
> Umm, there also seem to be some rendering artefacts that I think are to do with
> turning normals on in radiosity under the latest 3.7 beta.

Can you be more specific?

What I do see are two horizontal lines which are quite definitely 
radiosity artifacts indeed, but those are not particularly related to 
turning on normals. They are a general result of samples being taken 
during the final render, which are just more prone to appear when 
normals are turned on, for the simple reason that it requires a higher 
sample density.

Make sure you have always_sample off, low_error_factor set to something 
like 0.5, and reduce the pretrace_end value.

The radiosity statistics may give you a hint how good your pretrace 
settings are. I recommend making sure that no more than half the total 
number of samples is taken during the main render.

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