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With povr, in addition to quilted, I've taken dents back to a normal
perturbation only pattern.
What was the dents scalar value for maps pattern in POV-Ray was noise
cubed. I've kept the pattern, but renamed it noise_cubed.
I've also renamed the previously created povr f_dents() inbuilt function
to f_noise_cubed(). In looking at the inbuilt function again, I got to
playing around with alternative noise shaping methods.
One of these is used for the raised bits on an isosurface plain in the
attached image. The updated quilted normal perturbation pattern is
applied on top on the shape.
Bill P.
Post a reply to this message
Attachments:
Download 'povrquiltedandshapednoise.jpg' (227 KB)
Preview of image 'povrquiltedandshapednoise.jpg'
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William F Pokorny <ano### [at] anonymous org> wrote:
> With povr, in addition to quilted, I've taken dents back to a normal
> perturbation only pattern.
>
> What was the dents scalar value for maps pattern in POV-Ray was noise
> cubed. I've kept the pattern, but renamed it noise_cubed.
>
> I've also renamed the previously created povr f_dents() inbuilt function
> to f_noise_cubed(). In looking at the inbuilt function again, I got to
> playing around with alternative noise shaping methods.
>
> One of these is used for the raised bits on an isosurface plain in the
> attached image. The updated quilted normal perturbation pattern is
> applied on top on the shape.
>
> Bill P.
I looked at the noise generation code a while, and it's currently beyond my
ability to puzzle out - pretty complex with all that hash table stuff.
(Has anyone implemented Simplex Noise yet?)
I'm glad to see that you're renaming things to more accurately reflect what they
are.
Perhaps one approach to semi-retain some of the old naming would be to just make
an include file "legacy.inc" that has a list of things like
#declare dents = normal {noise_cubed} or whatever your syntax for that would be.
The isosurface looks great - I immediately thought it would make a great blood
vessel wall, or a work-eaten wood or bark, or sand dunes....
Probably lots of other immediate applications just by altering the colors and
textures.
Post a reply to this message
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On 11/12/20 2:48 PM, Bald Eagle wrote:
> William F Pokorny <ano### [at] anonymousorg> wrote:
...
>> to f_noise_cubed(). In looking at the inbuilt function again, I got to
>> playing around with alternative noise shaping methods.
>>
>> One of these is used for the raised bits on an isosurface plain in the
>> attached image. The updated quilted normal perturbation pattern is
>> applied on top on the shape.
>>
>> Bill P.
>
> I looked at the noise generation code a while, and it's currently beyond my
> ability to puzzle out - pretty complex with all that hash table stuff.
> (Has anyone implemented Simplex Noise yet?)
>
Not in any POV-Ray version that I'm aware. I looked at it briefly a long
while back. My take then was that it would be less, "better" for us than
those coming from the pure the pure Perlin type noise.
> I'm glad to see that you're renaming things to more accurately reflect what they
> are.
> Perhaps one approach to semi-retain some of the old naming would be to just make
> an include file "legacy.inc" that has a list of things like
> #declare dents = normal {noise_cubed} or whatever your syntax for that would be.
>
Something possible I guess, but cannot use "dents" as it's still there
as a normal only pattern.
> The isosurface looks great - I immediately thought it would make a great blood
> vessel wall, or a work-eaten wood or bark, or sand dunes....
> Probably lots of other immediate applications just by altering the colors and
> textures.
>
Thanks. (And just picked up plain rather than plane in my original post...)
I enabled the shaped noise options of f_noise_cubed() in the noise_cubed
pattern today and have been testing / playing. Attached an another image
using the pattern form with average.
Bill P.
Post a reply to this message
Attachments:
Download 'shapednoise.jpg' (287 KB)
Preview of image 'shapednoise.jpg'
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On 11/12/20 1:49 PM, William F Pokorny wrote:
> With povr, in addition to quilted, I've taken dents back to a normal
> perturbation only pattern.
>
...
> playing around with alternative noise shaping methods.
>
With povr, I decided to make use of one of the quilted normal
perturbation fixes not adopted as a new "tiled" normal perturbation only
pattern.
Further, while I played with the idea of a new offset parameter to let
the users make use of more of the internal quilt_cubic curve, I ended up
implementing new "lo" and "hi" keywords so users can "re-range" inputs
into the quilt_cubic curve function. Folks can make use of whatever
parts of the curve they want.
For quilted pattern the usual value input range is 0.5 to 0.866 and for
the new tiled pattern it's 0 to 0.5; Unless lo/hi used with other values
in which case re-ranging happens.
Attached a quilted normal used on the left and on the right the new
tiled normal only pattern; both with re-ranging into quilt_cubic.
Both images make use of noise shaping options of f_noise_cubed() for the
base isosurface.
I'm thinking about one additional normal only pattern - based on the
tiled approach - called grooved or furrowed, but we'll see.
Bill P.
Post a reply to this message
Attachments:
Download 'quilted_tiled_lo_hi.jpg' (492 KB)
Preview of image 'quilted_tiled_lo_hi.jpg'
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