[William P wrote:]
>
> With povr I've been using the following sort of scene set up to look at
> normals and inversion...
> //---
> #version unofficial 3.8; // povr
> global_settings { assumed_gamma 1 }
> #declare VarOrthoMult = ...
> [...snip]

[JR wrote:]
>
> have attached a mock-up example of an inc for POV-Ray proper.  the tag would
> just change to 'povr', and either inline or via an include have the specific
> stuff, and I think, the 'setidtypes.inc' content too.
>

[running v3.8.0 beta 1 in Windows]
I did not even know that there is an 'unofficial' keyword in POV-ray syntax; it
is not mentioned in 3.8's in-built documentation (at least not in the index of
keywords there). Interesting!

So, running JR's very neat little test scene (with his .inc file) like this:

#version 3.8; // no 'unofficial' keyword
global_settings {assumed_gamma 1}
box {0,1}
#include "version_test.inc"
#if (official_program())
#debug concat("prog is an official POV-Ray.\n")
#else
#debug concat("not an official POV-Ray.\n")
#end
#debug concat("ident: \"",idtag_program,"\".\n")

...... it parses and render fine, with the appropriate message.

But if I run it like this:

#version unofficial 3.8;
......

...... the scene fails outright, with the message
"line 1: Parse error: This scene was created for an unofficial version and
cannot work as-is with this official version."

I'm very naive about this stuff-- but is it to be expected that this
'unofficial' file should also run OK, and even in my Windows version of 3.8
(i.e., a non-"povr" version?) If not, then... never mind ;-) My apologies if I'm
simply "muddying the waters" of this discussion, but I thought I should mention
the parse error.

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