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Thomas de Groot <tho### [at] degrootorg> wrote:
> Op 02/01/2021 om 01:55 schreef Ton:
> > That's well done. I hope that when they write the review for 2021 next
> > year they can use a thumbs-up for the 1, and not a middle finger.
> >
> > Let's all have a good POV-year.
> >
> > Cheers
> > Ton
> >
>
> Yes, I join you in this. Happy POV Year to all.
>
2021 HAS to be better than 2020!
Just during the last three weeks, my older brother and his wife came down with
Covid-19, plus two local friends of mine and one of their wives. They are all
recovering, which is good news of course. I'm still feeling fine, I'm happy to
say.
Here in the United States, there have been TWO equally devastating viruses that
we have had to deal with: One is called 'Covid-19', the other is 'President
Donald Trump.' :-P One infects the body, the other infects the mind. I can't
even imagine how the rest of the world views our current and crazy U.S.
situation.
Cousin Ricky wrote:
> With blurred reflection on the floor.
Nice!
How did you get those blurred reflections? My few attempts over the years to use
micro-normals have always resulted in Moire patterns that I could not eliminate.
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On 2021-01-04 10:18 AM (-4), Kenneth wrote:
>
> Cousin Ricky wrote:
>> With blurred reflection on the floor.
>
> Nice!
Thanks!
> How did you get those blurred reflections? My few attempts over the years to use
> micro-normals have always resulted in Moire patterns that I could not eliminate.
I rendered 10 frames, with each frame having the micronormal translated
and rotated randomly, then averaged the 10 frames.
In retrospect, the rotation was probably overkill. My initial trials
with translation only showed what looked like a blend of sharp
reflection and blurred reflection, and since I have noticed regular
patterns in the bumps normal, I figured rotating the normal would help
the blurriness. Rotating did not help, but reducing(!) bump_size did.
Evidently, there is some sort of phase transition, somewhere between 0.1
and 0.5, above which increasing bump_size led to poorer results. The
final scene uses bump_size 0.05.
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"Cousin Ricky" <rickysttATyahooDOTcom> wrote:
> With blurred reflection on the floor.
The blurred reflection version is very nice, well done sir!
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"Kenneth" <kdw### [at] gmailcom> wrote:
> Here in the United States, there have been TWO equally devastating viruses that
> we have had to deal with: One is called 'Covid-19', the other is 'President
> Donald Trump.' :-P One infects the body, the other infects the mind. I can't
> even imagine how the rest of the world views our current and crazy U.S.
> situation.
I agree 100% Kenneth, Trumpty Dumpty is obviously (and literally) insane. Stay
safe!
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> Thomas de Groot <tho### [at] degrootorg> wrote:
>> Op 02/01/2021 om 01:55 schreef Ton:
>>> That's well done. I hope that when they write the review for 2021 next
>>> year they can use a thumbs-up for the 1, and not a middle finger.
>>>
>>> Let's all have a good POV-year.
>>>
>>> Cheers
>>> Ton
>>>
>>
>> Yes, I join you in this. Happy POV Year to all.
>>
>
> 2021 HAS to be better than 2020!
>
> Just during the last three weeks, my older brother and his wife came down with
> Covid-19, plus two local friends of mine and one of their wives. They are all
> recovering, which is good news of course. I'm still feeling fine, I'm happy to
> say.
>
> Here in the United States, there have been TWO equally devastating viruses that
> we have had to deal with: One is called 'Covid-19', the other is 'President
> Donald Trump.' :-P One infects the body, the other infects the mind. I can't
> even imagine how the rest of the world views our current and crazy U.S.
> situation.
>
> Cousin Ricky wrote:
>> With blurred reflection on the floor.
>
> Nice!
>
> How did you get those blurred reflections? My few attempts over the years to use
> micro-normals have always resulted in Moire patterns that I could not eliminate.
>
>
I tend to use some averaged micro-normals. Around 5 to 10 seems to work
well.
I prefer to use granite as my base pattern.
I also use rather large random translations after the scaling.
Also, when doing blurred reflection, I increase the AA recursion depth
to 5 or 6 and reduce the threshold to around 0.01 or even 0.001.
D. Trump is probably the worst leader to ever lead any country in Human
History. And, yes, he's bat shit crazy.
Alain
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Alain Martel <kua### [at] videotronca> wrote:
>
> I tend to use some averaged micro-normals. Around 5 to 10 seems to work
> well.
> I prefer to use granite as my base pattern.
> I also use rather large random translations after the scaling.
Granite-- I never thought of that. It is nicely 'random'. My own trials used
overlapped and rotated 'linear' patterns... like sine waves or scallop waves for
the normals, IIRC. Maybe that was the cause of my Moire patterns? I need to
experiment with your method.
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> Alain Martel <kua### [at] videotronca> wrote:
>
>>
>> I tend to use some averaged micro-normals. Around 5 to 10 seems to work
>> well.
>> I prefer to use granite as my base pattern.
>> I also use rather large random translations after the scaling.
>
> Granite-- I never thought of that. It is nicely 'random'. My own trials used
> overlapped and rotated 'linear' patterns... like sine waves or scallop waves for
> the normals, IIRC. Maybe that was the cause of my Moire patterns? I need to
> experiment with your method.
>
>
You can also try bozo/bumps/spotted or agate as your base pattern.
You can mix different patterns.
For example, you can use a large scale bozo and overlay it with
micro-normals using granite.
There are so many possibilities, you need to explore.
Tip when using averaged textures for complex objects or multiple objects
with blurred reflection :
Make two copies of your objects with blurred reflection. The first have
the full averaged texture and the no_reflection attribute. The second
have only the non-averaged micro-normals and the no_image attribute.
That way, when that object self reflect, or several objects that have
blurred reflection inter reflect, the number of rays to trace is kept to
a reasonable level.
This is not useful in the present case as the only surface with blurred
reflection is a ground plane.
Also, using averaged textures can be much faster that rendering multiple
times and averaging the resulting images externally. The render time hit
only affect the part of the image where there are averaged normals.
Multiple renders need to render the whole image multiple times, then,
you have the time needed to post process them.
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On 2021-01-06 1:44 PM (-4), Alain Martel wrote:
>> Alain Martel <kua### [at] videotronca> wrote:
>>
>>> I tend to use some averaged micro-normals. Around 5 to 10 seems to work
>>> well.
>>> I prefer to use granite as my base pattern.
>>> I also use rather large random translations after the scaling.
>>
>> Granite-- I never thought of that. It is nicely 'random'. My own
>> trials used
>> overlapped and rotated 'linear' patterns... like sine waves or scallop
>> waves for
>> the normals, IIRC. Maybe that was the cause of my Moire patterns?
I suspect so. Think of the regular patterns you see in 4-color
halftones in comic books.
However, Rune Johansen has a brushed metal texture that just averages 2
wood layers. It is quite convincing, even with no blur effect. It was
written for MegaPOV 0.5, but it is easily converted to 3.7/3.8.
http://runevision.com/3d/povgoodies/
> You can also try bozo/bumps/spotted or agate as your base pattern.
I tried crackle once, but it took longer than bumps and didn't look all
that great. Facets coords gives results similar to bumps, without
taking longer.
I have never thought to try granite or agate. Have you tried wrinkles?
> Tip when using averaged textures for complex objects or multiple objects
> with blurred reflection :
>
> Make two copies of your objects with blurred reflection. The first have
> the full averaged texture and the no_reflection attribute. The second
> have only the non-averaged micro-normals and the no_image attribute.
> That way, when that object self reflect, or several objects that have
> blurred reflection inter reflect, the number of rays to trace is kept to
> a reasonable level.
My RC3Metal module in the Object Collection uses this trick. Thanks
again for that idea.
> Also, using averaged textures can be much faster that rendering multiple
> times and averaging the resulting images externally. The render time hit
> only affect the part of the image where there are averaged normals.
> Multiple renders need to render the whole image multiple times, then,
> you have the time needed to post process them.
This was my first plan. But I had written the original scene using
POV-Ray 3.7, so to get the same effect as finish-level Fresnel, I had
used a layered texture. (Trust me, reflection-level Fresnel looked
horrible.) Then when I tried to change the bumpy layer to an averaged
texture, I got the old "Cannot layer a patterned texture over another"
error. Rather than attempt to rearrange the texture, or unravel the
texture to work with 3.8's finish-level Fresnel, I just chose the easy
way out. But yes, I agree that putting in the extra work would probably
have shortened the render time.
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Alain Martel <kua### [at] videotronca> wrote:
>
> Tips when using averaged textures for complex objects or multiple objects
> with blurred reflection...
Some very good tips; thanks Alain.
Cousin Ricky wrote:
> Rune Johansen has a brushed metal texture that just averages 2
> wood layers. It is quite convincing, even with no blur effect. It was
> written for MegaPOV 0.5, but it is easily converted to 3.7/3.8.
> http://runevision.com/3d/povgoodies/
Ah yes, thanks. I had lost that link. (I think it was my initial 'introduction'
to blurred reflections and such.)
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Hi(gh)!
On 05.01.21 16:17, Alain Martel wrote:
> D. Trump is probably the worst leader to ever lead any country in Human
> History. And, yes, he's bat shit crazy.
I disagree - far from being a Trumpist, I would say that Hitler, Stalin,
Pol Pot and Mao Tse-Tung were far worse! At least as long as Trump
doesn't declare a full-scale nuclear war on Russia and China just hours
before his tenure ends, just to ultimately demonstrate his psychopathy...
See you in Khyberspace!
Yadgar
Now playing: Little Neutrino (Klaatu)
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