Hi folks,

Ben from UnchartedX has just posted the stl file from a professional
metrological scan of a pre-dynastic rose quartz vase.

You can view the video and the one that precedes it to gain an appreciation of
exactly what this represents.

From a purely POV-Ray perspective, it would be great to get this rendered with
Thomas deGroot's Granite_21 textures, and maybe even post the results on YT and
other sites to show the capabilities of POV-Ray with regard to texture, finish,
normal, lighting, and sub-surface light transport.

The file is 44.6 MB, and it would be great if someone could convert it to a mesh
{} or preferably mesh2 {} object.  You could likely post it on a free
file-hosting service for the next 30 days like I did with F. Lohmueller's
(partial) web archive.

https://unchartedx.com/site/2023/02/19/new-video-updates-to-the-vase-scan-responses-and-the-stl-file/

Thanks,

Bill "Bald Eagle" Walker

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hi,

"Bald Eagle" <cre### [at] netscapenet> wrote:
> ...
> The file is 44.6 MB, and it would be great if someone could convert it to a mesh
> {} or preferably mesh2 {} object.  You could likely post it on a free
> file-hosting service for the next 30 days like I did with F. Lohmueller's
> (partial) web archive.

STL to GTS to POV :

<https://news.povray.org/web.5e75678e7c21754451952ca0%40news.povray.org>
<https://drive.google.com/file/d/10WT-D3MP4qYxnP1BYu5f_ZN_xmOo1P5W/view?usp=sharing>

(other, "better", 'stl2gts' converters available)


regards, jr.

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"jr" <cre### [at] gmailcom> wrote:
> ...
> STL to GTS to POV :

a v quick image made with those s/wares.


regards, jr.

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Attachments:
Download 'be-vase.png' (60 KB)

Preview of image 'be-vase.png'

- converted STL to OBJ with https://anyconv.com/stl-converter/   [40.8 Mb]
- converted OBJ to mesh2{} with Poseray   [87.0 Mb] --> [zip: 24.8 Mb]

-- 
Thomas

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Using Granite_21: "NorthAmericanPinkGranite" in my Studio setup.

-- 
Thomas

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Attachments:
Download 'predynastic_vase_01.jpg' (64 KB)

Preview of image 'predynastic_vase_01.jpg'

hi,

Thomas de Groot <tho### [at] degrootorg> wrote:
> - converted STL to OBJ with https://anyconv.com/stl-converter/   [40.8 Mb]
> - converted OBJ to mesh2{} with Poseray   [87.0 Mb] --> [zip: 24.8 Mb]

intrigued.  my "home made" mesh2 .inc file requires 117M formatted, and 99M with
leading whitespace and separating commas removed.  where does the extra 12M
saving come from?  can you post (or mail) a copy of your mesh, please?

the granite look does suit.

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On 23/02/2023 12:13, Thomas de Groot wrote:
> Using Granite_21: "NorthAmericanPinkGranite" in my Studio setup.
HI, Thomas.

Very good job ! Looks very natural, texture is high-detailed. When you
finish the scene, could you please send it to me ? I will do HD
animation and put it on my Youtube's POV-Ray channel.

All the best,
--
YB

Post a reply to this message

Thomas de Groot <tho### [at] degrootorg> wrote:
> Using Granite_21: "NorthAmericanPinkGranite" in my Studio setup.
>
> --
> Thomas

Well that certainly put a smile on my face.
I was trying to get to sleep, and I started (continued) thinking,
"He's not going to be able to resist doing it...."

And sure enough - converted, textured, and rendered.   :D

Thankfully, it's a mesh, and we can instantiate 30-40,000 of them to show how
easy it was to just bang these out with some sand and copper tools in our
copious amounts of uninterrupted free time without the need for a pesky lathe.
;)

'tis really a beautiful texture.

Thanks - off to shovel snow.

- BE

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Op 23-2-2023 om 12:28 schreef Bald Eagle:
> Thomas de Groot <tho### [at] degrootorg> wrote:
>> Using Granite_21: "NorthAmericanPinkGranite" in my Studio setup.
>>
>> --
>> Thomas
> 
> Well that certainly put a smile on my face.
> I was trying to get to sleep, and I started (continued) thinking,
> "He's not going to be able to resist doing it...."
> 
> And sure enough - converted, textured, and rendered.   :D
> 
Of course I can't! I am unable to resist such a call ;-)

> Thankfully, it's a mesh, and we can instantiate 30-40,000 of them to show how
> easy it was to just bang these out with some sand and copper tools in our
> copious amounts of uninterrupted free time without the need for a pesky lathe.
> ;)
> 
As you say. I was also thinking about those Egyptian craftsmen. I wonder 
how long it took to make such a vase out of granite...

> 'tis really a beautiful texture.
> 
It is. Trying a couple of other things presently.

> Thanks - off to shovel snow.
>
Good luck! You got a couple of nasty storms already this winter.

-- 
Thomas

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Op 23-2-2023 om 10:44 schreef jr:
> hi,
> 
> Thomas de Groot <tho### [at] degrootorg> wrote:
>> - converted STL to OBJ with https://anyconv.com/stl-converter/   [40.8 Mb]
>> - converted OBJ to mesh2{} with Poseray   [87.0 Mb] --> [zip: 24.8 Mb]
> 
> intrigued.  my "home made" mesh2 .inc file requires 117M formatted, and 99M with
> leading whitespace and separating commas removed.  where does the extra 12M
> saving come from?  can you post (or mail) a copy of your mesh, please?
>
No problem. Available here for the next 30 days:

  https://ufile.io/0wv5jpfc

> the granite look does suit.
> 
You do have Granite_21.mcr on your system, don't you?

I have made a small update to it, which makes it possible to call 
texture{Granite_21} instead of material{Granite_21}. It is not entirely 
ready to be posted yet though. Just don't uncomment the (new) Mat_Tex 
command.

-- 
Thomas

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Again, using Granite_21: "NorthAmericanPinkGranite" in my Studio setup, 
but 'polished' this time.

-- 
Thomas

Post a reply to this message

Attachments:
Download 'predynastic_vase_02.jpg' (60 KB)

Preview of image 'predynastic_vase_02.jpg'

Op 23-2-2023 om 02:03 schreef Bald Eagle:
> Hi folks,
> 
> Ben from UnchartedX has just posted the stl file from a professional
> metrological scan of a pre-dynastic rose quartz vase.
> 
> You can view the video and the one that precedes it to gain an appreciation of
> exactly what this represents.
> 
>  From a purely POV-Ray perspective, it would be great to get this rendered with
> Thomas deGroot's Granite_21 textures, and maybe even post the results on YT and
> other sites to show the capabilities of POV-Ray with regard to texture, finish,
> normal, lighting, and sub-surface light transport.
> 
> The file is 44.6 MB, and it would be great if someone could convert it to a mesh
> {} or preferably mesh2 {} object.  You could likely post it on a free
> file-hosting service for the next 30 days like I did with F. Lohmueller's
> (partial) web archive.
> 
>
https://unchartedx.com/site/2023/02/19/new-video-updates-to-the-vase-scan-responses-and-the-stl-file/
> 

To be sure you get it too (I posted the link separately to jr's 
request), the Vase mesh2 files can be downloaded here for the next 30 days:

  https://ufile.io/0wv5jpfc

I still need to test how sub-surface light transport will show itself 
off in the present setting.

-- 
Thomas

Post a reply to this message

hi,

Thomas de Groot <tho### [at] degrootorg> wrote:
> ...
> No problem. Available here for the next 30 days:

done, thank you.


> > the granite look does suit.
> You do have Granite_21.mcr on your system, don't you?
>
> I have made a small update to it, which makes it possible to call
> texture{Granite_21} instead of material{Granite_21}. It is not entirely
> ready to be posted yet though. Just don't uncomment the (new) Mat_Tex
> command.

I do, macro dated Aug 29th 2021; zip September 4th.  (time does fly..)  "not
entirely ready" </sigh>  can appreciate that :-).


regards, jr.

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Op 23-2-2023 om 15:40 schreef jr:
>> I have made a small update to it, which makes it possible to call
>> texture{Granite_21} instead of material{Granite_21}. It is not entirely
>> ready to be posted yet though. Just don't uncomment the (new) Mat_Tex
>> command.
> 
> I do, macro dated Aug 29th 2021; zip September 4th.  (time does fly..)  "not
> entirely ready" </sigh>  can appreciate that :-).
>
Ha! I just need to check for bugs and limitations...

-- 
Thomas

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Op 23-2-2023 om 11:23 schreef yesbird:
> On 23/02/2023 12:13, Thomas de Groot wrote:
>> Using Granite_21: "NorthAmericanPinkGranite" in my Studio setup.
> HI, Thomas.
> 
> Very good job ! Looks very natural, texture is high-detailed. When you
> finish the scene, could you please send it to me ? I will do HD
> animation and put it on my Youtube's POV-Ray channel.
> 
> 

Thanks! I shall send it to you asap.

-- 
Thomas

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Using Granite_21: "DakotaRedGranite" in my Studio setup, with 
'polished', and 'sslt'.

I am not very sure if sslt makes a difference here...

-- 
Thomas

Post a reply to this message

Attachments:
Download 'predynastic_vase_03b.jpg' (63 KB)

Preview of image 'predynastic_vase_03b.jpg'

hi,

Thomas de Groot <tho### [at] degrootorg> wrote:
> Using Granite_21: "DakotaRedGranite" in my Studio setup, with
> 'polished', and 'sslt'.
>
> I am not very sure if sslt makes a difference here...

it's all v subjective, of course, but I think this image "best" of the three,
think the difference of the top surface alone made it worth having.

re the mesh.  looks like either of the s/wares you used did some optimisation
(of vertices).  luckily the "geom" file contained a very useful header, I used
that to have a few tries with the (gts) 'cleanup' utility, and got down to 55M
without any apparent/visual differences.  hope to find some more time over the
weekend, see how small it can be made.  (thanks)

regards, jr.

Post a reply to this message

Op 24-2-2023 om 07:53 schreef jr:
> hi,
> 
> Thomas de Groot <tho### [at] degrootorg> wrote:
>> Using Granite_21: "DakotaRedGranite" in my Studio setup, with
>> 'polished', and 'sslt'.
>>
>> I am not very sure if sslt makes a difference here...
> 
> it's all v subjective, of course, but I think this image "best" of the three,
> think the difference of the top surface alone made it worth having.
> 
I agree. I had come to the same conclusion.

> re the mesh.  looks like either of the s/wares you used did some optimisation
> (of vertices).  luckily the "geom" file contained a very useful header, I used
> that to have a few tries with the (gts) 'cleanup' utility, and got down to 55M
> without any apparent/visual differences.  hope to find some more time over the
> weekend, see how small it can be made.  (thanks)
> 
Interesting. I have no idea what those conversion programs are doing 
under the hood, but if you can work out a smaller conversion output, I 
would be the first to cheer. ;-)

-- 
Thomas

Post a reply to this message

On 24/02/2023 11:37, Thomas de Groot wrote:
> Interesting. I have no idea what those conversion programs are doing 
> under the hood, but if you can work out a smaller conversion output, I 
> would be the first to cheer. ;-)
You can also compare it with my version of conversion ).
STL->ZBrush->OBJ->PoseRay->POV

Download: 
https://drive.google.com/file/d/12xbZmiV09RMdWOIC6t5nWv2qXKDyvB-T/view?usp=share_link
--
YB

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According to this site:

https://www.theglobaleducationproject.org/egypt/articles/hrdfact3.php

The grain size of the stone looks more like the example attached here. 
However, all depends on the /real size/ of the objects themselves, and 
most seem to be on the scale of inches/centimetres.

-- 
Thomas

Post a reply to this message

Attachments:
Download 'predynastic_vase_04c.jpg' (67 KB)

Preview of image 'predynastic_vase_04c.jpg'

On 24/02/2023 16:10, Thomas de Groot wrote:
> According to this site:
> 
> https://www.theglobaleducationproject.org/egypt/articles/hrdfact3.php
> 
> The grain size of the stone looks more like the example attached here. 
> However, all depends on the /real size/ of the objects themselves, and 
> most seem to be on the scale of inches/centimetres.

I like how it looks, but don't you think that little bit more light at 
the bottom will enhance perception of material and shape ?
--
YB

Post a reply to this message

Op 24-2-2023 om 13:56 schreef yesbird:
> On 24/02/2023 11:37, Thomas de Groot wrote:
>> Interesting. I have no idea what those conversion programs are doing 
>> under the hood, but if you can work out a smaller conversion output, I 
>> would be the first to cheer. ;-)
> You can also compare it with my version of conversion ).
> STL->ZBrush->OBJ->PoseRay->POV
> 
> Download: 
>
https://drive.google.com/file/d/12xbZmiV09RMdWOIC6t5nWv2qXKDyvB-T/view?usp=share_link
> -- 
> 
168 Mb?? No way!  ;-)

-- 
Thomas

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On 24/02/2023 16:16, Thomas de Groot wrote:
> 168 Mb?? No way!  ;-)

It's up to you, no doubt, but I only wonder how did you get 168 Mb ?
--------------------------------------------------------
-- OBJ --
-rw-r--r-- 1 Serge None 37802447 Feb 24 15:33 Vase.obj

-- STL --
-rw-r--r-- 1 Serge None 46857234 Feb 24 15:32 Vase.stl

-- POV --
-rw-r--r-- 1 Serge None 91690504 Feb 24 15:39 Vase_POV_geom.inc
-rw-r--r-- 1 Serge None     1192 Feb 24 15:39 Vase_POV_main.ini
-rw-r--r-- 1 Serge None    15189 Feb 24 15:39 Vase_POV_mat.inc
-rw-r--r-- 1 Serge None     3534 Feb 24 15:39 Vase_POV_scene.pov
--------------------------------------------------------
YB

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Op 24-2-2023 om 14:25 schreef yesbird:
> On 24/02/2023 16:16, Thomas de Groot wrote:
>> 168 Mb?? No way!  ;-)
> 
> It's up to you, no doubt, but I only wonder how did you get 168 Mb ?

that is what is mentioned on the download site for the zip file.

-- 
Thomas

Post a reply to this message

On 24/02/2023 16:36, Thomas de Groot wrote:
> that is what is mentioned on the download site for the zip file.
))), understand, here is a version optimized by ZBrush retopology algorithm:

https://drive.google.com/file/d/17_vDzUOItuiWXtEAk7PXM7WeEzQhcPRn/view?usp=share_link
--
YB

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Here it is. Also increased the light intensity a tad (personally, I 
prefer the darker version where the surroundings are less visible)

The optimised mesh has the same quality as the 'heavier' one. Well done!

-- 
Thomas

Post a reply to this message

Attachments:
Download 'predynastic_vase_optimised_01.jpg' (124 KB)

Preview of image 'predynastic_vase_optimised_01.jpg'

On 24/02/2023 19:27, Thomas de Groot wrote:
> Here it is. Also increased the light intensity a tad (personally, I 
> prefer the darker version where the surroundings are less visible)
I like how it looks now, but this is your project - your rules :)
And don't you think that it's time to animate it now (putting on
turntable first) ?

 > The optimised mesh has the same quality as the 'heavier' one. Well done!
This is Pixologic's magic, not mine :)
--
YB

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hi,

Thomas de Groot <tho### [at] degrootorg> wrote:
> ...
> Interesting. I have no idea what those conversion programs are doing
> under the hood, but if you can work out a smaller conversion output, I
> would be the first to cheer. ;-)

cheer away :-)  link to 6.1M zip, 17M mesh.  looks unchanged, afaict.  (started
playing with a rose quartz material, so sample scene is .. untidy)

<https://drive.google.com/file/d/11yr1A4GXITRcXe-YZFwRRybKmaij9e8H/view?usp=sharing>


regards, jr.

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"Bald Eagle" <cre### [at] netscapenet> wrote:

Analysis of the provided mesh is a work in progress.
All measurements are in the Imperial inch system as stated by the metrologists
Alex Dunn and Nick Sierra in the video.
Therefore all <x, y, z? vertex coordinates are in inches as well.

The original mesh is roughly center-of-mass with the top pointing in the -z
direction.
Height is 4.72 inches
Radius of body is 1.67 inches

Still working on establishing a center axis and radius for the lug handles.
The measured data points only extend so far beyond the surface, making the use
of trace {} difficult.

Once that is established, next would be the
best-fit sphere center and radius for the vase body
best-fit sphere center and radius for the vase lip bottom
best-fit cone and radii for the vase bottom


https://unchartedx.com/site/2023/02/19/new-video-updates-to-the-vase-scan-responses-and-the-stl-file/

Granite_21 macro by Thomas deGroot is here:
https://news.povray.org/povray.binaries.scene-files/thread/%3C6134aced%40news.povray.org%3E/

Tabulated macro by jr is here:
http://news.povray.org/povray.text.scene-files/message/%3Cweb.610402268669d715e0fed26cde94f1%40news.povray.org%3E/#%3Cw
eb.610402268669d715e0fed26cde94f1%40news.povray.org%3E



Bill "Bald Eagle" Walker

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Attachments:
Download 'vase_pov_scene.png' (230 KB)

Preview of image 'vase_pov_scene.png'

hi,

"Bald Eagle" <cre### [at] netscapenet> wrote:
> Analysis of the provided mesh is a work in progress.
> ...

neat.  when I use the 'vase_3.pov' with shadowless lights and explicit no
reflection on anything, and use a srgbft pigment (like yr recent "gyroid"
thing), I see interior "features" too.


regards, jr.

Post a reply to this message

Op 27-2-2023 om 03:22 schreef Bald Eagle:
> "Bald Eagle" <cre### [at] netscapenet> wrote:
> 
> Analysis of the provided mesh is a work in progress.
> All measurements are in the Imperial inch system as stated by the metrologists
> Alex Dunn and Nick Sierra in the video.
> Therefore all <x, y, z? vertex coordinates are in inches as well.
> > The original mesh is roughly center-of-mass with the top pointing in 
the -z
> direction.
> Height is 4.72 inches
> Radius of body is 1.67 inches
> 
Very good.
I did my transformations (on the original converted OBJ files) in 
Poseray, centering and then rotating the vase, and dropping it to y=0, 
/before/ exporting to POV-Ray.

> Still working on establishing a center axis and radius for the lug handles.
> The measured data points only extend so far beyond the surface, making the use
> of trace {} difficult.
> 
In my studio set-up I used trace {} to put the vase on the 'pedestal'. 
The 'base' of the vase effectively is situated at y=0 in the geometry file.

//Bounding Box....... from x,y,z=(-1.8839052,0,-1.7086791)
//                      to x,y,z=(1.8823464,4.72023337158,1.6314062)
//                 size dx,dy,dz=(3.7662516,4.72023337158,3.3400853)
//                  center 
x,y,z=(-0.000779399999999986,2.36011668579,-0.0386364499999997)
//                       diagonal 6.90082777701024

And the same from the 'optimized' version (note that for some reason, 
the size is much larger. yesbird?):

//Bounding Box....... from 
x,y,z=(-14.3452792176383,-3.5527136788005E-15,-12.7048841803871)
//                      to 
x,y,z=(14.3585772287516,35.890494,12.6954582633151)
//                 size dx,dy,dz=(28.70385644639,35.890494,25.4003424437023)
//                  center 
x,y,z=(0.00664900555663106,17.945247,-0.00471295853600395)
//                       diagonal 52.5092023431736

> Once that is established, next would be the
> best-fit sphere center and radius for the vase body
> best-fit sphere center and radius for the vase lip bottom
> best-fit cone and radii for the vase bottom
> 
Ok.

-- 
Thomas

Post a reply to this message

"jr" <cre### [at] gmailcom> wrote:
> hi,
>
> "Bald Eagle" <cre### [at] netscapenet> wrote:
> > Analysis of the provided mesh is a work in progress.
> > ...
>
> neat.  when I use the 'vase_3.pov' with shadowless lights and explicit no
> reflection on anything, and use a srgbft pigment (like yr recent "gyroid"
> thing), I see interior "features" too.
>
>
> regards, jr.

Yeah - I did an intersection to slice it in half, and was wondering what all
that was about.  Might be just poor mesh structure due to conversion from a raw
point cloud / stl-obj-pov .... ?

Post a reply to this message

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

> I did my transformations (on the original converted OBJ files) in
> Poseray, centering and then rotating the vase, and dropping it to y=0,
> /before/ exporting to POV-Ray.

I didn't play a lot with Poseray once I got the file converted.
I wanted all the subsequent processing to be done in a way that's easily traced
(SDL) and preserved the raw data.  But the sweet textured renders of the
processed mesh are nice and really show the results possible with POV-Ray and
granite_21   :)

https://sketchfab.com/3d-models/pre-dynastic-egyptian-vase-9d0564976fec4d718aca1d661cec212a


Did you do your transformations by eye/feel?
My -z rotation was based on some trace() results on the lug handles, followed by
some atan2 () hocus-pocus that I'm calling good-enough for now.



> In my studio set-up I used trace {} to put the vase on the 'pedestal'.
> The 'base' of the vase effectively is situated at y=0 in the geometry file.


The bounding box that Poseray assigns to the vase seems fine heightwise, but
overly wide, so getting it to sit at y=0 was fairly straightforward.
I'm wondering what Poseray and Meshlab, and even Matlab have for mesh-feature
analysis tools.

I'm guessing that Polyworks has all the pricey bells and whistles for
identifying such features and fitting planes, spheres and cones in a
least-squares best-fit fashion to a model.

Maybe I need to slice the vas at the lug handle hole and inspect the mesh at a
high magnification to see why I'm not getting good trace() results.

Post a reply to this message

Op 27-2-2023 om 12:47 schreef Bald Eagle:
> Thomas de Groot <tho### [at] degrootorg> wrote:
> 
>> I did my transformations (on the original converted OBJ files) in
>> Poseray, centering and then rotating the vase, and dropping it to y=0,
>> /before/ exporting to POV-Ray.
> 
> I didn't play a lot with Poseray once I got the file converted.
> I wanted all the subsequent processing to be done in a way that's easily traced
> (SDL) and preserved the raw data.  But the sweet textured renders of the
> processed mesh are nice and really show the results possible with POV-Ray and
> granite_21   :)
> 
Sure!

>
https://sketchfab.com/3d-models/pre-dynastic-egyptian-vase-9d0564976fec4d718aca1d661cec212a
> 
> 
> Did you do your transformations by eye/feel?
> My -z rotation was based on some trace() results on the lug handles, followed by
> some atan2 () hocus-pocus that I'm calling good-enough for now.
> 
No. I let Poseray give me the necessary values and acted on them.


>> In my studio set-up I used trace {} to put the vase on the 'pedestal'.
>> The 'base' of the vase effectively is situated at y=0 in the geometry file.
> 
> 
> The bounding box that Poseray assigns to the vase seems fine heightwise, but
> overly wide, so getting it to sit at y=0 was fairly straightforward.

You think so? Once rendered, I do not see any significant width 
difference compared to the STL original.

> I'm wondering what Poseray and Meshlab, and even Matlab have for mesh-feature
> analysis tools.
> 
> I'm guessing that Polyworks has all the pricey bells and whistles for
> identifying such features and fitting planes, spheres and cones in a
> least-squares best-fit fashion to a model.
> 
> Maybe I need to slice the vas at the lug handle hole and inspect the mesh at a
> high magnification to see why I'm not getting good trace() results.
> 
Just wondering: did you try to trace the model while still on its side? 
I have not been trying that so I wouldn't know indeed about bounding box 
issues there.

-- 
Thomas

Post a reply to this message

On 27/02/2023 12:25, Thomas de Groot wrote:
> And the same from the 'optimized' version (note that for some reason, 
> the size is much larger. yesbird?):

Perhaps ZBrush doing rescale while importing and optimization, in any
case applying 'scale' should not me a problem, I suppose.
--
YB

Post a reply to this message

On 27/02/2023 12:25, Thomas de Groot wrote:
> And the same from the 'optimized' version (note that for some reason, 
> the size is much larger. yesbird?):

Perhaps ZBrush does rescale while importing and/or optimizing, in any
case applying 'scale' before rendering should not be a problem, I suppose.
--
YB

Post a reply to this message

hi,

"Bald Eagle" <cre### [at] netscapenet> wrote:
> ...
> Yeah - I did an intersection to slice it in half, and was wondering what all
> that was about.  Might be just poor mesh structure due to conversion from a raw
> point cloud / stl-obj-pov .... ?

in the stl data, I guess.  although TdG uses different OS and tools, both meshes
have the same "shadows".


regards, jr.

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This makes me curious....

https://polyworks.software.informer.com/12.0/

Anyone willing to give it a go?

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Op 27-2-2023 om 15:15 schreef yesbird:
> On 27/02/2023 12:25, Thomas de Groot wrote:
>> And the same from the 'optimized' version (note that for some reason, 
>> the size is much larger. yesbird?):
> 
> Perhaps ZBrush doing rescale while importing and optimization, in any
> case applying 'scale' should not me a problem, I suppose.
> -- 
> 
I guessed that to be the case indeed, and no, it is not a problem by 
itself. However, it is good to be aware of this especially if the goal 
is to recreate a 1:1 scale model.

-- 
Thomas

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Op 27-2-2023 om 13:19 schreef Thomas de Groot:
> Op 27-2-2023 om 12:47 schreef Bald Eagle:
>> The bounding box that Poseray assigns to the vase seems fine 
>> heightwise, but
>> overly wide, so getting it to sit at y=0 was fairly straightforward.
> 
I forgot to mention in my earlier comment that in Poseray I generally 
start (in the Groups window) on a new model:

1- 'Weld vertices'
2- 'Remove orphan vertices'
3- 'Recalculate normals'

without changing 'Crease angle' or 'Tolerance'.

If stray vertices exist, the bounding box may thus be improved.

Then, I do the transforms I deem necessary for my subsequent use in 
POV-Ray. Poseray is very efficient for this although you may have to 
play a bit with the application before you get it right.

-- 
Thomas

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Update:

A link to this detailed analysis of the vase has just been posted.

https://unsigned.io/granite-artifact/

I'll be out to work and then doing things this afternoon, but maybe if others
are interested, they can read, play with it, write some macros and scenes, etc.

- BW

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Op 27-2-2023 om 03:22 schreef Bald Eagle:
> Height is 4.72 inches
> Radius of body is 1.67 inches
> 

Ok. I used this to apply to the vase in my studio setup.

1- I converted inches to centimeters
2- I used the following code by Alain to scale the vase to POV-unit scale:
 
http://news.povray.org/povray.newusers/thread/%3C60c8e000%241%40news.povray.org%3E/
3- I scaled the object the object to Real World sizes

The result is attached. Note that the grid on the pedestal is a 1 meter 
square corresponding to 1 POV-unit. Subdivisions in 10 centimeter 
squares. The grid was applied as an object pattern to the texture of the 
pedestal.

-- 
Thomas

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Attachments:
Download 'predynastic_vase_06.jpg' (58 KB)

Preview of image 'predynastic_vase_06.jpg'

Op 1-3-2023 om 12:12 schreef Bald Eagle:
> Update:
> 
> A link to this detailed analysis of the vase has just been posted.
> 
> https://unsigned.io/granite-artifact/
> 
> I'll be out to work and then doing things this afternoon, but maybe if others
> are interested, they can read, play with it, write some macros and scenes, etc.
> 
> 

To answer (part of) the questions of the author, see for instance:

https://www.oocities.org/unforbidden_geology/ancient_egyptian_stone_vase_making.html

-- 
Thomas

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Op 25-2-2023 om 16:20 schreef jr:
> cheer away :-)  link to 6.1M zip, 17M mesh.  looks unchanged, afaict.  (started
> playing with a rose quartz material, so sample scene is .. untidy)
> 
> <https://drive.google.com/file/d/11yr1A4GXITRcXe-YZFwRRybKmaij9e8H/view?usp=sharing>
> 
> 
Somehow, I am snowed under by all the messages on miscellaneous subjects 
lately (and other matters) that I must have missed your contribution. :-/

I added the granite_21 texture and got this. Indeed, the mesh is as 
smooth as the earlier/heavier ones.

So, what does it say about the /need/ for POV-Ray use of such a 'heavy' 
mesh? I guess that for most cases we could do with less. It is a pity 
that Poseray does not allow for simplifying meshes, only subdividing it 
further (afaik).

-- 
Thomas

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Attachments:
Download 'vase_3.jpg' (91 KB)

Preview of image 'vase_3.jpg'

Il 01/03/2023 12:12, Bald Eagle ha scritto:
> Update:
> 
> A link to this detailed analysis of the vase has just been posted.
> 
> https://unsigned.io/granite-artifact/
> 
> I'll be out to work and then doing things this afternoon, but maybe if others
> are interested, they can read, play with it, write some macros and scenes, etc.
> 
> - BW
> 
> 

The analysis is very thorough, are you the author of the pictures?

Paolo

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Paolo Gibellini <p.g### [at] gmailcom> wrote:

> The analysis is very thorough, are you the author of the pictures?
>
> Paolo

Nope.  That's Mark Qvist.   I got in touch with him through github, and he's
supposed to get back to me sometime soon.  :)

Check this out too:

https://twitter.com/mariusderomanu3

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hi,

Thomas de Groot <tho### [at] degrootorg> wrote:
> Op 25-2-2023 om 16:20 schreef jr:
> > cheer away :-)  ...
> Somehow, I am snowed under by all the messages on miscellaneous subjects
> lately (and other matters) that I must have missed your contribution. :-/

it is small.  </grin>


> So, what does it say about the /need/ for POV-Ray use of such a 'heavy'
> mesh? ...

had not realised earlier that a scale-correct 1:1 representation is the goal.
but in light of that, I'd argue that while it's a WIP, the highest possible
resolution, then scale down for use.  (much like oversizing a render (gut
feeling))


regards, jr.

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Op 3-3-2023 om 12:25 schreef jr:
> had not realised earlier that a scale-correct 1:1 representation is the goal.
> but in light of that, I'd argue that while it's a WIP, the highest possible
> resolution, then scale down for use.  (much like oversizing a render (gut
> feeling))
> 
Well, there is no specific goal afaiac, except if one wants to use 
Granite_21 in a 'natural' way, then it might be important. However, that 
is a choice and all options are free of course. ;-)

...and when we want to reproduce the object at its true size/aspect.

-- 
Thomas

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Thomas de Groot <tho### [at] degrootorg> wrote:
> Op 3-3-2023 om 12:25 schreef jr:
> > had not realised earlier that a scale-correct 1:1 representation is the goal.
> > but in light of that, I'd argue that while it's a WIP, the highest possible
> > resolution, then scale down for use.  (much like oversizing a render (gut
> > feeling))
> >
> Well, there is no specific goal afaiac, except if one wants to use
> Granite_21 in a 'natural' way, then it might be important. However, that
> is a choice and all options are free of course. ;-)
>
> ...and when we want to reproduce the object at its true size/aspect.

Well, there are different goals at different stages.

The first goal was to rapidly get a very nice looking render with the Granite_21
material to show off POV-Ray's textures and the potential for
near-photorealistic render quality.

The second is to poke around the mesh and examine whatever features may present
themselves, given that we have a very high quality mesh, and the tools to play
with normals, lighting, signal processing, trace (), and anything else you can
think of.

Here's a sort of uv-unwrapped render of the outer and inner surfaces, done with
trace (), 2 arrays, and 4 million triangles.  I still need to correct the
scaling and positioning of the lower color_map.  <eyroll>

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Attachments:
Download 'vasesurface.png' (113 KB)

Preview of image 'vasesurface.png'

hi,

"Bald Eagle" <cre### [at] netscapenet> wrote:
> ...
> Here's a sort of uv-unwrapped render of the outer and inner surfaces, ...

wow, neat.  (what do you (collective) make of the interior?  paint?)


regards, jr.

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