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Some time ago and entirely by chance, I came across this site/image:
https://www.printables.com/model/431413-illusion-cube
I thought this was an interesting shape and I built my own version in
POV-Ray code:
//==========================================================
#declare BaseBox =
box {
<-1.00, -1.00, -1.00>,< 1.00, 1.00, 1.00>
}
#declare InsideHollow =
union {
box {< 0.00, -0.899, -0.70>,< 1.01, 0.70, 0.899>}//+x
box {<-1.01, -0.70, -0.899>,< 0.00, 0.899, 0.70>}//-x
box {<-0.70, -0.70, 0.00>,< 0.899, 0.899, 1.01>}//+z
box {<-0.899, -0.899, -1.01>,< 0.70, 0.70, 0.00>}//-z
box {<-0.899, 0.00, -0.70>,< 0.70, 1.01, 0.899>}//+y
box {<-0.70, -1.01, -0.899>,< 0.899, 0.00, 0.70>}//-y
box {<-0.90, -0.90, -0.90>,< 0.90, 0.90, 0.90> }
}
#declare EdgeHollow = box {<-1.01, -0.2, -0.2>,< 1.01, 0.2, 0.2>}
#declare EdgeHollowsTop =
union {
object {EdgeHollow translate <0.00, 1.00,-1.00>}
object {EdgeHollow rotate 90*y translate < 1.00, 1.00, 0.00>}
}
#declare EdgeHollowsBase =
union {
object {EdgeHollow translate <0.00, -1.00, 1.00>}
object {EdgeHollow rotate 90*y translate <-1.00, -1.00, 0.00>}
}
#declare EdgeHollowsSides =
union {
object {EdgeHollow rotate 90*z translate <-1.00, 0.00, 1.00>}
object {EdgeHollow rotate 90*z translate <1.00, 0.00,-1.00>}
}
#declare IllusionBox =
difference {
object {BaseBox}
object {InsideHollow /*pigment {rgb <0,1,0>}*/}
object {EdgeHollowsTop /*pigment {rgb <1,0,0>}*/}
object {EdgeHollowsBase /*pigment {rgb <1,0,0>}*/}
object {EdgeHollowsSides /*pigment {rgb <1,0,0>}*/}
pigment {rgb 0.9}
}
object {IllusionBox}
//==========================================================
Adding a spaceship I built years ago using Silo, and a media (portal?) I
composed the present scene.
--
Thomas
Post a reply to this message
Attachments:
Download 'tdg_illusion box_final.jpg' (213 KB)
Preview of image 'tdg_illusion box_final.jpg'
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On 2023-07-29 08:34 (-4), Thomas de Groot wrote:
> [snip]
>
> Adding a spaceship I built years ago using Silo, and a media (portal?) I
> composed the present scene.
That's a nice star field! It looks more convincing than most CGI star
fields I've seen for which diffraction spikes were attempted.
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hi,
Thomas de Groot <tho### [at] degroot org> wrote:
> Some time ago and entirely by chance, I came across this site/image:
> ...
> I thought this was an interesting shape and I built my own version in
> POV-Ray code:
thanks, hope to look at this closer soon-ish.
(wondering if it could be drawn with a 3D L-system ? :-))
> Adding a spaceship I built years ago using Silo, and a media (portal?) I
> composed the present scene.
don't know much about spaceships (or star fields :-)), but the scene has that
"Twilight Zone" kind of feel. very pleasing.
regards, jr.
Post a reply to this message
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Thomas de Groot <tho### [at] degrootorg> wrote:
> Some time ago and entirely by chance, I came across this site/image:
> https://www.printables.com/model/431413-illusion-cube
>
> I thought this was an interesting shape and I built my own version in
> POV-Ray code:
>
> //==========================================================
> #declare BaseBox =
> box {
> <-1.00, -1.00, -1.00>,< 1.00, 1.00, 1.00>
> }
>
> #declare InsideHollow =
> union {
> box {< 0.00, -0.899, -0.70>,< 1.01, 0.70, 0.899>}//+x
> box {<-1.01, -0.70, -0.899>,< 0.00, 0.899, 0.70>}//-x
>
> box {<-0.70, -0.70, 0.00>,< 0.899, 0.899, 1.01>}//+z
> box {<-0.899, -0.899, -1.01>,< 0.70, 0.70, 0.00>}//-z
>
> box {<-0.899, 0.00, -0.70>,< 0.70, 1.01, 0.899>}//+y
> box {<-0.70, -1.01, -0.899>,< 0.899, 0.00, 0.70>}//-y
>
> box {<-0.90, -0.90, -0.90>,< 0.90, 0.90, 0.90> }
> }
>
> #declare EdgeHollow = box {<-1.01, -0.2, -0.2>,< 1.01, 0.2, 0.2>}
>
> #declare EdgeHollowsTop =
> union {
> object {EdgeHollow translate <0.00, 1.00,-1.00>}
> object {EdgeHollow rotate 90*y translate < 1.00, 1.00, 0.00>}
> }
>
> #declare EdgeHollowsBase =
> union {
> object {EdgeHollow translate <0.00, -1.00, 1.00>}
> object {EdgeHollow rotate 90*y translate <-1.00, -1.00, 0.00>}
> }
>
> #declare EdgeHollowsSides =
> union {
> object {EdgeHollow rotate 90*z translate <-1.00, 0.00, 1.00>}
> object {EdgeHollow rotate 90*z translate <1.00, 0.00,-1.00>}
> }
>
> #declare IllusionBox =
> difference {
> object {BaseBox}
> object {InsideHollow /*pigment {rgb <0,1,0>}*/}
> object {EdgeHollowsTop /*pigment {rgb <1,0,0>}*/}
> object {EdgeHollowsBase /*pigment {rgb <1,0,0>}*/}
> object {EdgeHollowsSides /*pigment {rgb <1,0,0>}*/}
>
> pigment {rgb 0.9}
> }
>
> object {IllusionBox}
> //==========================================================
>
> Adding a spaceship I built years ago using Silo, and a media (portal?) I
> composed the present scene.
>
> --
> Thomas
Very cool. Love the look.
Miller
Post a reply to this message
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Op 29-7-2023 om 19:31 schreef Cousin Ricky:
> On 2023-07-29 08:34 (-4), Thomas de Groot wrote:
>> [snip]
>>
>> Adding a spaceship I built years ago using Silo, and a media (portal?) I
>> composed the present scene.
>
> That's a nice star field! It looks more convincing than most CGI star
> fields I've seen for which diffraction spikes were attempted.
>
Thanks. The star field is Milkyway_BG.exr which I found a year ago...
somewhere. Typically, I failed to note its exact origin :-(
I have not used it much yet but I also like it.
--
Thomas
Post a reply to this message
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Op 29-7-2023 om 20:56 schreef jr:
> hi,
>
> Thomas de Groot <tho### [at] degrootorg> wrote:
>> Some time ago and entirely by chance, I came across this site/image:
>> ...
>> I thought this was an interesting shape and I built my own version in
>> POV-Ray code:
>
> thanks, hope to look at this closer soon-ish.
>
> (wondering if it could be drawn with a 3D L-system ? :-))
>
Ha! Who knows? I'll leave that to the L-system gang which is haunting
these ng's lately... ;-)
>
>> Adding a spaceship I built years ago using Silo, and a media (portal?) I
>> composed the present scene.
>
> don't know much about spaceships (or star fields :-)), but the scene has that
> "Twilight Zone" kind of feel. very pleasing.
>
Thanks, jr. I didn't think about the "Twilight Zone" when I worked on
this, but I agree.
--
Thomas
Post a reply to this message
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Op 30-7-2023 om 03:17 schreef Mike Miller:
> Very cool. Love the look.
> Miller
>
Thanks Mike
--
Thomas
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Thomas de Groot <tho### [at] degrootorg> wrote:
> Some time ago and entirely by chance, I came across this site/image:
> https://www.printables.com/model/431413-illusion-cube
>
> I thought this was an interesting shape and I built my own version in
> POV-Ray code:
Nice. :)
I would have been tempted to do it as a union, probably trying to be (too)
clever and using some kind of algorithm to use +/- <x, y, z>, etc.
It _does_ kind of scream ... 3D L-system, now doesn't it? :D
This IS very well done - it has a very nice overall space fields, where all of
the elements come together and blend into a nicely composed space scene.
- BW
Post a reply to this message
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Op 30-7-2023 om 13:40 schreef Bald Eagle:
> Thomas de Groot <tho### [at] degrootorg> wrote:
>> Some time ago and entirely by chance, I came across this site/image:
>> https://www.printables.com/model/431413-illusion-cube
>>
>> I thought this was an interesting shape and I built my own version in
>> POV-Ray code:
>
> Nice. :)
>
> I would have been tempted to do it as a union, probably trying to be (too)
> clever and using some kind of algorithm to use +/- <x, y, z>, etc.
>
Oh, I am sure there are better ways; I just did a quick-and-dirty
modelling without thinking too deeply about other options. ;-)
> It _does_ kind of scream ... 3D L-system, now doesn't it? :D
>
Now, you are the second one here to mention that. I have not paid much
attention to the L_system discussion here however.
> This IS very well done - it has a very nice overall space fields, where all of
> the elements come together and blend into a nicely composed space scene.
>
Thanks indeed. It was a good occasion to use that Milkyway star field
together with my old spaceship. Always nice dig into the old dusty
coffers with discarded and forgotten models... :-)
--
Thomas
Post a reply to this message
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Thomas de Groot <tho### [at] degrootorg> wrote:
>
> Adding a spaceship I built years ago using Silo, and a media (portal?) I
> composed the present scene.
>
Hi,
that's a wonderful piece of art.
(Might be interesting to test it with Chris Colefax' Galaxy plugin.)
It reminds me of a SciFi series called 'Andromeda' and there it was a portal to
a different universe.
And yes, it's a form of a Hilbert curve and it was used as logo for SGI.
Cheers, Droj
(one of the Lsystem gang)
Post a reply to this message
Attachments:
Download 'ls_hilb_0a.png' (320 KB)
Preview of image 'ls_hilb_0a.png'
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Op 31/07/2023 om 20:50 schreef Droj:
> Thomas de Groot <tho### [at] degrootorg> wrote:
>
>>
>> Adding a spaceship I built years ago using Silo, and a media (portal?) I
>> composed the present scene.
>>
>
> Hi,
>
> that's a wonderful piece of art.
> (Might be interesting to test it with Chris Colefax' Galaxy plugin.)
>
Thank you indeed. Correct, I forgot about CC's plugin. When I have some
time I shall dig that one up. Thanks for reminding me.
> It reminds me of a SciFi series called 'Andromeda' and there it was a portal to
> a different universe.
>
> And yes, it's a form of a Hilbert curve and it was used as logo for SGI.
>
Ah! A Hilbert curve. Appropriate for the scene ;-)
> Cheers, Droj
> (one of the Lsystem gang)
>
Keep up the good work, gang!
--
Thomas
Post a reply to this message
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Thomas de Groot <tho### [at] degrootorg> wrote:
> Some time ago and entirely by chance, I came across this site/image:
> https://www.printables.com/model/431413-illusion-cube
>
> I thought this was an interesting shape and I built my own version in
> POV-Ray code:
>
> [code]
>
> Adding a spaceship I built years ago using Silo, and a media (portal?) I
> composed the present scene.
>
> --
> Thomas
Cool scene, Thomas!
It's an intriguing shape to be sure, and I can't help but wonder if it's
possible to make it work for other Platonic solids (tetrahedron, octahedron,
etc.)
> [...] The star field is Milkyway_BG.exr which I found a year ago...
> somewhere. Typically, I failed to note its exact origin :-(
Are you familiar with tineye.com? You can upload an image or give it an image
link, and it will try to find other images on the web. It fails sometimes but,
when successful, it will find even higher-resolution images.
Sam
Post a reply to this message
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Op 07/08/2023 om 23:32 schreef Samuel B.:
> Thomas de Groot <tho### [at] degrootorg> wrote:
>> I thought this was an interesting shape and I built my own version in
>> POV-Ray code:
>>
>> [code]
>>
>> Adding a spaceship I built years ago using Silo, and a media (portal?) I
>> composed the present scene.
>>
>
> Cool scene, Thomas!
Thanks Sam!
>
> It's an intriguing shape to be sure, and I can't help but wonder if it's
> possible to make it work for other Platonic solids (tetrahedron, octahedron,
> etc.)
Possibly yes; a hint for the L-systems gang? ;-)
>
>> [...] The star field is Milkyway_BG.exr which I found a year ago...
>> somewhere. Typically, I failed to note its exact origin :-(
>
> Are you familiar with tineye.com? You can upload an image or give it an image
> link, and it will try to find other images on the web. It fails sometimes but,
> when successful, it will find even higher-resolution images.
>
Yes I am familiar with it but in this case it failed. Very strange...
--
Thomas
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Il 29/07/2023 14:34, Thomas de Groot ha scritto:
> Some time ago and entirely by chance, I came across this site/image:
> https://www.printables.com/model/431413-illusion-cube
>
Very interesting!
Paolo
Post a reply to this message
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Thomas de Groot <tho### [at] degrootorg> wrote:
> Some time ago and entirely by chance, I came across this site/image:
> https://www.printables.com/model/431413-illusion-cube
>
> I thought this was an interesting shape and I built my own version in
> POV-Ray code:
>
> //==========================================================
> ............
>
> object {IllusionBox}
> //==========================================================
>
> --
> Thomas
It emits light.
Why ghost appears like that?
Maybe ghost looks more like a human...
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Op 13/10/2023 om 06:31 schreef And:
> It emits light.
> Why ghost appears like that?
>
> Maybe ghost looks more like a human...
>
>
I guess that it is a portal...
--
Thomas
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Thomas de Groot <tho### [at] degrootorg> wrote:
> Op 13/10/2023 om 06:31 schreef And:
> > It emits light.
> > Why ghost appears like that?
> >
> > Maybe ghost looks more like a human...
> >
> >
> I guess that it is a portal...
>
> --
> Thomas
Do you use facebook, Thomas?
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Op 14/10/2023 om 05:49 schreef And:
> Thomas de Groot <tho### [at] degrootorg> wrote:
>> Op 13/10/2023 om 06:31 schreef And:
>>> It emits light.
>>> Why ghost appears like that?
>>>
>>> Maybe ghost looks more like a human...
>>>
>>>
>> I guess that it is a portal...
>>
>> --
>> Thomas
>
> Do you use facebook, Thomas?
>
No.
--
Thomas
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Thomas de Groot <tho### [at] degrootorg> wrote:
> Op 14/10/2023 om 05:49 schreef And:
> >>
> >> --
> >> Thomas
> >
> > Do you use facebook, Thomas?
> >
>
> No.
>
> --
> Thomas
Thank you.
I have found that it is hard to search.
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Op 15-10-2023 om 07:49 schreef And:
> Thomas de Groot <tho### [at] degrootorg> wrote:
>> Op 14/10/2023 om 05:49 schreef And:
>>>>
>>>> --
>>>> Thomas
>>>
>>> Do you use facebook, Thomas?
>>>
>>
>> No.
>>
>> --
>> Thomas
>
> Thank you.
>
> I have found that it is hard to search.
>
To be more specific about the "ghost": it is not so much the media
inside the structure which I named so in the subject's title, but rather
the box-like structure itself which is a kind of 'non-box' which only
'suggests' where the 'real' box should be. Difficult to describe this in
words indeed; just try to visualise this in your mind looking at the image.
--
Thomas
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Thomas de Groot <tho### [at] degrootorg> wrote:
>
> To be more specific about the "ghost": it is not so much the media
> inside the structure which I named so in the subject's title, but rather
> the box-like structure itself which is a kind of 'non-box' which only
> 'suggests' where the 'real' box should be. Difficult to describe this in
> words indeed; just try to visualise this in your mind looking at the image.
> --
> Thomas
Ha ha...
I can't feel the mathematics trick (shape) is an unusual thing now.
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