Thomas de Groot <tho### [at] degrootorg> wrote:
> Op 13/01/2024 om 02:30 schreef Samuel B.:
> >
> > Is Analog even still being published? Some of those stories were great.
> >
> It seems to be:
>
> https://www.analogsf.com/

Ah cool. I'm a bit tempted to get a subscription for my mom (which would
eventually make its way here as well). I should probably check with the library
before doing that, though :D

> > The default uv mapping is going to be different for every primitive, of course,
> > and some stretching is guaranteed in any case.
> >
> Yes, I noticed that.
>
> > I'm thinking that for complex objects, triplanar mapping might be the best thing
> > to use. (Triplanar mapping in POV-Ray would probably use 3 nested slope maps,
> > with each axis getting one planar map). There /is/ a blending issue when using
> > triplanar mapping, but it can be mitigated somewhat. It's one of those things I
> > haven't gotten around to yet (I was going to use something similar to depict
> > claymation-style fingerprints on objects), but if I make any headway I'll post
> > it.
> >
> > I'm thinking crackle form x patterns as a basis, but it's going to take a bit of
> > work...
> >
> Exciting info indeed! I shall study these ideas also; I don't like to
> sit back and wait for others to do the dirty jobs :-)
>
> --
> Thomas

That's the spirit!

I managed to get one thing done today: the triplanar mapping
(https://news.povray.org/povray.binaries.images/thread/%3Cweb.65a4705751388f9716bed5696e741498%40news.povray.org%3E/).
It's very basic and doesn't have a sharpness setting (rate of transition between
normals).

The craters idea will have to wait for another day.

Sam

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Op 15/01/2024 om 00:50 schreef Samuel B.:
> Thomas de Groot <tho### [at] degrootorg> wrote:
>> Op 13/01/2024 om 02:30 schreef Samuel B.:
>>>
>>> Is Analog even still being published? Some of those stories were great.
>>>
>> It seems to be:
>>
>> https://www.analogsf.com/
> 
> Ah cool. I'm a bit tempted to get a subscription for my mom (which would
> eventually make its way here as well). I should probably check with the library
> before doing that, though :D
> 
<grin>
It is amazing that they still do exist after such a long time (1930, if 
I am correct). Analog was indeed my first introduction to the (serious) 
SF literature.

>>> The default uv mapping is going to be different for every primitive, of course,
>>> and some stretching is guaranteed in any case.
>>>
>> Yes, I noticed that.
>>
>>> I'm thinking that for complex objects, triplanar mapping might be the best thing
>>> to use. (Triplanar mapping in POV-Ray would probably use 3 nested slope maps,
>>> with each axis getting one planar map). There /is/ a blending issue when using
>>> triplanar mapping, but it can be mitigated somewhat. It's one of those things I
>>> haven't gotten around to yet (I was going to use something similar to depict
>>> claymation-style fingerprints on objects), but if I make any headway I'll post
>>> it.
>>>
>>> I'm thinking crackle form x patterns as a basis, but it's going to take a bit of
>>> work...
>>>
>> Exciting info indeed! I shall study these ideas also; I don't like to
>> sit back and wait for others to do the dirty jobs :-)
>>
>> --
>> Thomas
> 
> That's the spirit!
> 
> I managed to get one thing done today: the triplanar mapping
>
(https://news.povray.org/povray.binaries.images/thread/%3Cweb.65a4705751388f9716bed5696e741498%40news.povray.org%3E/).
> It's very basic and doesn't have a sharpness setting (rate of transition between
> normals).
> 
That is really looking good, Sam! I shall have to play with this.

Yesterday, I was exploring different issues more or less related to this 
and I experimented with the lunar crater image inside a cubic pattern, 
thinking that, perhaps, it would do something /similar/ to triplanar 
mapping. Of course it didn't, but it was a useful sidetrack because I 
could use it in an interesting way with a superellipsoid for instance, 
and even with the ovus object (which last one has a strange basic 
uv_mapping which I cannot agree with).

I had not got around to switch to pigment_pattern or image_pattern use, 
but it was on my ToDo.

> The craters idea will have to wait for another day.
> 
Of course. Still, a great progress already and worth a warm round of 
applause!

-- 
Thomas

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And here is a first view of the logo with triplanar mapping (and other 
background changes).

Still wip scene of course...

-- 
Thomas

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Attachments:
Download 'logoplanet_triplanar.png' (832 KB)

Preview of image 'logoplanet_triplanar.png'

hi,

Thomas de Groot <tho### [at] degrootorg> wrote:
> And here is a first view ...

"Just turn your eyeballs into craters ..." ;-)


(could that device be Hawkwind's long sought for "Orgone Accumulator" ?)


regards, jr.

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Op 17-1-2024 om 18:19 schreef jr:
> hi,
> 
> Thomas de Groot <tho### [at] degrootorg> wrote:
>> And here is a first view ...
> 
> "Just turn your eyeballs into craters ..." ;-)
> 
Thanks! I am very happy to have triplanar mapping available within 
POV-Ray now. Could solve some issues I had in the past.

> 
> (could that device be Hawkwind's long sought for "Orgone Accumulator" ?)
> 
LOL yes, might well be indeed...

[now playing: Hawkwind - "Orgone Accumulator" from Space Ritual album]

...ancient memories... ;-)

-- 
Thomas

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Thomas de Groot <tho### [at] degrootorg> wrote:
> And here is a first view of the logo with triplanar mapping (and other
> background changes).
>
> Still wip scene of course...
>
> [...]
>
> Thanks! I am very happy to have triplanar mapping available within
> POV-Ray now. Could solve some issues I had in the past.

It's coming right along! I like the idea of the moon-textured P exterior around
the planet.

I forgot to mention it (and you probably already know this), but triplanar
mapping doesn't play well with hard edges. I can't really see a problem in your
image due to the shadows on the inside of the round shape, but discontinuities
are likely there.

SAm

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Op 19-1-2024 om 00:54 schreef Samuel B.:
> It's coming right along! I like the idea of the moon-textured P exterior around
> the planet.
> 
Thanks Sam, yes, this triplanar mapping is what was needed here. 
Different little ideas I got at night while not sleeping I want to 
try/implement into the next version.

> I forgot to mention it (and you probably already know this), but triplanar
> mapping doesn't play well with hard edges. I can't really see a problem in your
> image due to the shadows on the inside of the round shape, but discontinuities
> are likely there.
> 
No problem here and, possibly, not even a real problem if visible: I can 
imagine that craters would not line-up over hard edges like here. I have 
not decided yet if the inside of the crescent should not get a different 
texture though...

-- 
Thomas

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Thomas de Groot <tho### [at] degrootorg> wrote:
> Op 19-1-2024 om 00:54 schreef Samuel B.:
> > It's coming right along! I like the idea of the moon-textured P exterior around
> > the planet.
> >
> Thanks Sam, yes, this triplanar mapping is what was needed here.
> Different little ideas I got at night while not sleeping I want to
> try/implement into the next version.

What is it with not being able to sleep as well over time? Less endogenous
melatonin?

> > I forgot to mention it (and you probably already know this), but triplanar
> > mapping doesn't play well with hard edges. I can't really see a problem in your
> > image due to the shadows on the inside of the round shape, but discontinuities
> > are likely there.
> >
> No problem here and, possibly, not even a real problem if visible: I can
> imagine that craters would not line-up over hard edges like here.

Right, that makes sense. The only way that would happen is if the impacts blew
holes through the edges, but making that work wouldn't be easy...

> I have not decided yet if the inside of the crescent should not get a different
> texture though...
>
> --
> Thomas

Like what? Something half molten? Or crumbly?

Sam

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Op 22/01/2024 om 02:10 schreef Samuel B.:
> Thomas de Groot <tho### [at] degrootorg> wrote:
>> Op 19-1-2024 om 00:54 schreef Samuel B.:
>>> It's coming right along! I like the idea of the moon-textured P exterior around
>>> the planet.
>>>
>> Thanks Sam, yes, this triplanar mapping is what was needed here.
>> Different little ideas I got at night while not sleeping I want to
>> try/implement into the next version.
> 
> What is it with not being able to sleep as well over time? Less endogenous
> melatonin?
> 
Oh no! nothing as dramatic! :-) I sleep very well indeed (eight to nine 
hours on an average night) which, at my age, is rather exceptional. 
However, and I think that many experience the same, I may wake up at 
night with an idea/solution for something I have been working on during 
the previous day(s).

>>> I forgot to mention it (and you probably already know this), but triplanar
>>> mapping doesn't play well with hard edges. I can't really see a problem in your
>>> image due to the shadows on the inside of the round shape, but discontinuities
>>> are likely there.
>>>
>> No problem here and, possibly, not even a real problem if visible: I can
>> imagine that craters would not line-up over hard edges like here.
> 
> Right, that makes sense. The only way that would happen is if the impacts blew
> holes through the edges, but making that work wouldn't be easy...
> 
Correct, but I am not modelling the Real World, as you probably may have 
noticed by now... :-)

>> I have not decided yet if the inside of the crescent should not get a different
>> texture though...
> 
> Like what? Something half molten? Or crumbly?
> 
Not sure yet. The ideas are in flux...

-- 
Thomas

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Il 17/01/2024 17:49, Thomas de Groot ha scritto:
> And here is a first view of the logo with triplanar mapping (and other 
> background changes).
> 
> Still wip scene of course...
> 

A very nice improvement of the scene, Thomas!
Just a question: the detail of the planet seems different respect the 
detail of the rusted P of the logo. Is it intended?

Paolo

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