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PostPosted: Tue, 15-07-14, 16:40 GMT 
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Maybe this will be of some interest to the 3D modellers round here?

NASA: Astronomers Bring The Third Dimension To A Doomed Star's Outburst
MNRAS: Steffen et al. (2014) "The three-dimensional structure of the Eta Carinae Homunculus"


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PostPosted: Tue, 15-07-14, 21:06 GMT 
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The 3D model is available in STL and OBJ format, downloadable from the link within NASA article. No clue about its Celestia orientation, from my part...

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PostPosted: Wed, 16-07-14, 2:39 GMT 
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on average the axis of rotation is X
with blender an "odd ball" X ( top / northpole) is in front pointing at you

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PostPosted: Thu, 17-07-14, 0:31 GMT 
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I printed one, it is realy nice. I hope it doesn't explode.

G

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PostPosted: Thu, 17-07-14, 17:39 GMT 
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abramson wrote:
I printed one, it is realy nice. I hope it doesn't explode.

G
"It" will, sooner or later! 8)

Nice one G. Is it a solid or hollow model, and how big did you print it?

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PostPosted: Thu, 17-07-14, 17:57 GMT 
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chuft-captain wrote:
Nice one G. Is it a solid or hollow model, and how big did you print it?


12 cm. It is solid (well, not solid, there is a mesh inside, I don't remember the name in English). It has no flat surface, so it had to be printed with suport material. I would have liked to make it orange, but it was not available. A student in my course of Classical Mechanics last year is a genius of robotics and made the printer himself at home.

The name "homunculus" was given to this nebula by the father of Physics in Argentina, Enrique Gaviola. He studied in Germany with Einstein, Born, Sommerfeld, Noether and many others. We heve his University book with his grades signed by all those great masters in our library. He was Director of my Institute, and instrumental in its creation in 1955. He was a great experimental physicist and astrophysicis. During his years at the head of the Cordoba Observatory he studied Eta Car, made its first spectroscopy and measured its winds, and christened the thing. He was the founder of the Argentine Physical Society. He's a kind of a hero around here.

Guillermo


Attachments:
homunculo 3d.JPG
homunculo 3d.JPG [ 421.79 KiB | Viewed 3792 times ]

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PostPosted: Thu, 17-07-14, 18:15 GMT 
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Quote:
I don't remember the name in English
"Honeycomb" perhaps? -- So it has quite a lot of empty space inside? That's a good thing for 3D printing because it uses less material.
I might do a print myself, in that case!

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PostPosted: Thu, 17-07-14, 18:45 GMT 
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chuft-captain wrote:
Quote:
I don't remember the name in English
"Honeycomb" perhaps? -- So it has quite a lot of empty space inside? That's a good thing for 3D printing because it uses less material.
I might do a print myself, in that case!


That's it, honeycomb.

Attachment:
printing.jpg
printing.jpg [ 60.69 KiB | Viewed 3788 times ]

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PostPosted: Fri, 18-07-14, 18:28 GMT 
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A quick and dirty rendering in Celestia:
Attachment:
Eta-Carinae-2.jpg
Eta-Carinae-2.jpg [ 129.2 KiB | Viewed 3753 times ]

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PostPosted: Sat, 19-07-14, 1:42 GMT 
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That should be easy to texturing. The stretching of the spherical UV map on both the heads would follows the gases expansions.

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PostPosted: Sat, 19-07-14, 2:48 GMT 
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random noise
Image

Image

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PostPosted: Sat, 19-07-14, 4:55 GMT 
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Good one! Maniacs could (3D) paint on it like from pictures. :o

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PostPosted: Sat, 19-07-14, 5:59 GMT 
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Thx for the texture John,

Here it is in Celestia with texture (+red-shift color) applied (Model has the texture applied to diffuse and emissive channels, 70pc opaque) and Emissive = true in SSC.
Attachment:
Eta-Carinae-3.jpg
Eta-Carinae-3.jpg [ 106.08 KiB | Viewed 3734 times ]

I'm not too satisfied with these results so far....
... especially in OpenGL2.0 mode, where the "Emissive" directive appears to be ignored (Celestia 1.6):
Attachment:
Eta-Carinae-3-OGL2.jpg
Eta-Carinae-3-OGL2.jpg [ 66.08 KiB | Viewed 3734 times ]

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PostPosted: Sat, 19-07-14, 7:07 GMT 
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here is a UV mapped cmod using a 2k map
https://drive.google.com/file/d/0B6ZYAd ... sp=sharing
( click on "file / download")

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PostPosted: Sat, 19-07-14, 8:01 GMT 
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Here's your model in Celestia John.

Seems to suffer from some kind of depth-sorting problem in Celestia. Notice the missing triangles, which will render OK if the viewing angle changes.
(My model, to some extent, also suffers from similar but slightly different effects).
Attachment:
Eta-Carinae-4-JVV-OGL2.jpg
Eta-Carinae-4-JVV-OGL2.jpg [ 86.88 KiB | Viewed 3732 times ]

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