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I rendered a scene with SSLT but forgot to add #version 3.7 to the
scene. It rendered fine with little difference between them, just noise
on the Mesh. There was no warning about the version, should there be?
I re-rendered the #version 3.7 again and there are differences on all
the images as if I was using crand. Does it matter which noise generator
you use. I was using Perlin.
--
Regards
Stephen
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On 12/02/2011 7:10 PM, Stephen wrote:
> I re-rendered the #version 3.7 again and there are differences on all
> the images as if I was using crand. Does it matter which noise generator
> you use. I was using Perlin.
At higher aa settings it is hardly noticeable.
--
Regards
Stephen
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Am 12.02.2011 20:10, schrieb Stephen:
> I rendered a scene with SSLT but forgot to add #version 3.7 to the
> scene. It rendered fine with little difference between them, just noise
> on the Mesh. There was no warning about the version, should there be?
As a general rule-of-thumb, the #version setting only affects /changed/
features (that would otherwise break backward compatibility), not new ones.
> I re-rendered the #version 3.7 again and there are differences on all
> the images as if I was using crand. Does it matter which noise generator
> you use. I was using Perlin.
No, the Perlin-alike-noise generator used for patterns (e.g. bozo) and
turbulence (which is always Perlin-alike) has nothing to do with it;
SSLT doesn't need a 3D random pattern - just a stream of pseudo-random
numbers and vectors.
The difference in the noise is simply due to differences in the order in
which pixels are rendered. In POV-Ray 3.6 that's line-by-line, and in
POV-Ray 3.7 it's block-by-block (with the order of blocks being somewhat
arbitrary due to the use of multiple parallel threads, making results
differ even from render to render).
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On 13/02/2011 1:29 AM, clipka wrote:
> As a general rule-of-thumb, the #version setting only affects /changed/
> features (that would otherwise break backward compatibility), not new ones.
>
That is good to know.
> No, the Perlin-alike-noise generator used for patterns (e.g. bozo) and
> turbulence (which is always Perlin-alike) has nothing to do with it;
> SSLT doesn't need a 3D random pattern - just a stream of pseudo-random
> numbers and vectors.
>
Again, good to know.
> The difference in the noise is simply due to differences in the order in
> which pixels are rendered. In POV-Ray 3.6 that's line-by-line, and in
> POV-Ray 3.7 it's block-by-block (with the order of blocks being somewhat
> arbitrary due to the use of multiple parallel threads, making results
> differ even from render to render).
That makes sense as when comparing different rendering of the same
scene, some blocks are identical.
Thanks for your reply/
--
Regards
Stephen
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