On 12/28/2013 04:24 AM, Thomas de Groot wrote:
> On 28-12-2013 1:20, Cousin Ricky wrote:
>> I made no changes to the scene description file.  I put Version=3.5 on
>> the
>> command line.  In my version of demo_outdoor.pov, dated 2009 August 11
>> 19:21:16
>> (11:21:16 pm UT), the assumed_gamma is not commented out.
>
> why version 3.5? It seems to me that if you want the scene rendered in
> POV-Ray 3.7 that should be the version number... or do I miss something
> here?

Because it was written /for/ version 3.5--or at least seemed so until I 
discovered that the modification date was in 2009.  The intention was to 
invoke any available backward compatibility concessions so that the 
scene would render as intended at the time it was written.  But 2009 was 
during the 3.6 time frame, which shouldn't make all that much of a 
difference from 3.5.

The point is that backward compatibility is not available for the 
crackle pattern, which was the basis for defining the land form.

Anyhow, here is a comprehensive set of POV-Ray 3.7 runs:

demo_outdoor-v3.7-noset.jpg  - no Version on the command line
demo_outdoor-v3.7-set3.5.jpg - Version=3.5 on the command line
demo_outdoor-v3.7-set3.6.jpg - Version=3.6 on the command line
demo_outdoor-v3.7-set3.7.jpg - Version=3.7 on the command line

The only differences I can see are to the brightness of the scene.

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Attachments:
Download 'demo_outdoor-v3.7-noset.jpg' (25 KB) Download 'demo_outdoor-v3.7-set3.5.jpg' (33 KB) Download 'demo_outdoor-v3.7-set3.6.jpg' (32 KB) Download 'demo_outdoor-v3.7-set3.7.jpg' (24 KB)

Preview of image 'demo_outdoor-v3.7-noset.jpg'

Preview of image 'demo_outdoor-v3.7-set3.5.jpg'

Preview of image 'demo_outdoor-v3.7-set3.6.jpg'

Preview of image 'demo_outdoor-v3.7-set3.7.jpg'