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

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

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

Op 30-7-2023 om 03:17 schreef Mike Miller:
> Very cool. Love the look.
> Miller
> 
Thanks Mike

-- 
Thomas

Post a reply to this message

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

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

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'

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

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

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

Post a reply to this message