> Alain<aze### [at] qwertyorg>  wrote:
>
>
>> Also, you should use a merge of the two transparent boxes.
>>
>>
>>
>>
>> Alain
>
> Oh, I forgot to ask.  Why a merge?  The two transparent boxes do not have any
> shared area.  Which is what I thought a merge helped with.  Is this not the
> case?
>
>

Looking at your code again, and effectively, a merge is not needed in 
this case.
I had the impression that the transparent boxes did overlap. Adding some 
colour to them helped showing that there is no overlap.

As to why artefacts appeared or not after a small rotation: You may get 
lucky sometimes and when viewed from a precise direction, you may always 
detect the surfaces in the same order. The ior may, or not, have an effect.



Alain

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