Am 09.07.2016 um 08:52 schrieb Thomas de Groot:
> On 7-7-2016 16:02, Bald Eagle wrote:
>> I see:
>> #declare WriteStrands = off; //set to 'on' for the first pass.
>>
>> Isn't there a way to just check if the file exists, and if not, create
>> it?
>> I looked - but it's not clear that this is possible.
>> Seemed like a useful and desirable feature to be added, if that's the
>> case.
>>
> 
> In fact, there is a simple reason why I did not use the file_exists(S)
> function, now that I think about it. It is that you may want to test
> different settings before choosing the final ones (at least that is how
> I work) and so - except for the very first time - there is always a file
> present.

You could use something like:

    #declare WriteStrands = off; // set to 'on' to force re-writing
    ...
    #if (!file_exists(...)) #declare WriteStrands = on; #end

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