Am 02.02.2015 um 23:27 schrieb Le_Forgeron:

> Can you try to add the "optional" file type before the filename ?
> (if it works, you would need to specialise your macro on file type)
>
> something like
>
> height_field{ png picture_name }

Sounds like a bug to me. If height field's file type is optional when 
using a string literal for the filename, it should just as well be 
optional when using a string variable.

Shall we draw straws who gets to fix this?

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