Op 28/04/2021 om 00:17 schreef Bald Eagle:
> Here's the half-noise half-cells pattern I worked out.
> 
> Adjusting Start and End to be both 0.5 gives results identical to cells.   Due
> to the smoothstep, you can never get pure gradient noise.
> 
> I thought it was wasted time as it still has some gradient to it, but with
> double-entry color_maps, you get a sharp delineation anyway...
> 
> Please "give it the treatment" and see if this produces something better or
> worse than the turbulated cells.
> 
Thanks. Preparing the scalpels now...

> (And your email bounced me.  :P)
> 
Hu?

-- 
Thomas

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Thomas de Groot <tho### [at] degrootorg> wrote:

> > (And your email bounced me.  :P)
> >
> Hu?

Undelivered Mail Returned to Sender

Mail Delivery System (MAI### [at] mailvanrycknet)

This is the mail system at host mail.vanryck.net.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

                  The mail system

<_ple### [at] localhostlocaldomain>: Think about your  life
    decisions. Think about them!

.... etc.

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Op 28-4-2021 om 12:48 schreef Bald Eagle:
> Thomas de Groot <tho### [at] degrootorg> wrote:
> 
>>> (And your email bounced me.  :P)
>>>
>> Hu?
> 
> Undelivered Mail Returned to Sender
> 
> Mail Delivery System (MAI### [at] mailvanrycknet)
> 
> This is the mail system at host mail.vanryck.net.
> 
> I'm sorry to have to inform you that your message could not
> be delivered to one or more recipients. It's attached below.
> 
> For further assistance, please send mail to postmaster.
> 
> If you do so, please include this problem report. You can
> delete your own text from the attached returned message.
> 
>                    The mail system
> 
> <_ple### [at] localhostlocaldomain>: Think about your  life
>      decisions. Think about them!
> 
> .... etc.
> 

Aha! Yes! The phony mail address. Fooled you :-)

-- 
Thomas

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Op 28-4-2021 om 00:17 schreef Bald Eagle:
> Here's the half-noise half-cells pattern I worked out.
> 
> Adjusting Start and End to be both 0.5 gives results identical to cells.   Due
> to the smoothstep, you can never get pure gradient noise.
> 
> I thought it was wasted time as it still has some gradient to it, but with
> double-entry color_maps, you get a sharp delineation anyway...
> 
> Please "give it the treatment" and see if this produces something better or
> worse than the turbulated cells.
> 

Busy still. Started late today. Already can say that StepNoise might be 
*IT*. It looks great. Shall be back tomorrow with more comments.

-- 
Thomas

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Op 28-4-2021 om 00:17 schreef Bald Eagle:
> Here's the half-noise half-cells pattern I worked out.
> 
> Adjusting Start and End to be both 0.5 gives results identical to cells.   Due
> to the smoothstep, you can never get pure gradient noise.
> 
> I thought it was wasted time as it still has some gradient to it, but with
> double-entry color_maps, you get a sharp delineation anyway...
> 
> Please "give it the treatment" and see if this produces something better or
> worse than the turbulated cells.
> 

I do not want to have you wait: This is the first render with StepNoise. 
My judgment is: perfection.

-- 
Thomas

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Attachments:
Download 'dakotagrains_sn_test.jpg' (92 KB)

Preview of image 'dakotagrains_sn_test.jpg'

hi,

Thomas de Groot <tho### [at] degrootorg> wrote:
> ... perfection.

"Flanders (medium) Gray".  :-)


regards, jr.

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Thomas de Groot <tho### [at] degrootorg> wrote:

> I do not want to have you wait: This is the first render with StepNoise.
> My judgment is: perfection.

.... holy crap!  :O

I would have never guessed it would THAT good!  Thanks for not making me wait.
That is indeed MUCH better than the turbulated cells experiment.  I'm glad that
it's panning out and we have something to work with as a good base pattern.

I'd say the next thing to do would be to have that texture be an entry in a
marble pattern texture_map, with a quartz texture as the vein.

After that, you're going to be the geological expert on whatever else might make
worthwhile additions.

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Quick stab at adding the vein.

Didn't like marble or planar, so I coded a Boolean math function for the stripe,
and let it blend on the sides.

Adding a mod to the function will repeat it, but it's too regular.
I tried warp {repeat x*4} but that repeats the whole pattern, and you get hard
lines.

I thought maybe I could layer it, but it's a pattern texture, and POV-Ray says
"No way!"

I also tried to add a specular highlight, and I'm too inept to get that to work
either.

Nor could I get the void created by using a difference to be anything but black.

It's unclear to me at the present time how to have separate turbulence values
for the stripe and the base StepNoise pattern, but I guess we'll figure that out
as we proceed.

Currently using the sum of two turbulated stripe patterns, so maybe the
placement of the stripes will have to be generated by a macro and an array of
plane offsets.

Anyway, this gives the general idea.

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Attachments:
Download 'granite_veins_1.png' (192 KB)

Preview of image 'granite_veins_1.png'

And the code:

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Attachments:
Download 'granite_veins_1.pov.txt' (4 KB)

Op 28/04/2021 om 17:47 schreef jr:
> hi,
> 
> Thomas de Groot <tho### [at] degrootorg> wrote:
>> ... perfection.
> 
> "Flanders (medium) Gray".  :-)
> 
> 
> regards, jr.
> 

For the time being, yes ;-)

-- 
Thomas

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