Revisited : Killeen's M27 nebula with Robert Gendler picture

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jll
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Revisited : Killeen's M27 nebula with Robert Gendler picture

Post #1by jll » 10.12.2005, 23:04

Hi again,

I am always wondering of Rob Gendler astroimages 8O
( http://www.robgendlerastropics.com/ ).

He gave me its gracious agreement for use his picture to create new add-ons.

Here is a first test with M27 (I use Killeen's add-on for stc and ssc files and create a new mesh and texture).
http://j.leboutet.free.fr/celestia/models/M27_3D.zip

Image

Image

Image

Enjoy

Jll
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ANDREA
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Post #2by ANDREA » 11.12.2005, 00:15

Jill, now you are our nebula guru! :wink:
M27 is wonderful, as is the new RCW_79 nebula you just released. :D
Very well done, indeed!
Go one this way, please, there are a lot of beautiful nebuae waiting for you (M42, just for an example?). :wink:
Bye and thanks a lot.

Andrea :D
"Something is always better than nothing!"
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Topic author
jll
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With us: 22 years 10 months

Post #3by jll » 11.12.2005, 11:34

It's a big challenge, M42 is more complex :?

I tried some meshes but the result wasn't as good as i expected :cry: (especially from a side point of view)

Image

even if some details are fun

Image

Well, ... i'll must test other meshes ... :wink:

If you like nebula, i uploaded some others on motherlode some time ago.
(Helix, M57, NGC 3132, Eta Carinae, MZ3, He2-104)

Bye
Jll
AMD Ath1800+ 512mb : Nvidia GeForce6200 AGP 256mb

WinXPPro:FS1280x1024x32:

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ANDREA
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Post #4by ANDREA » 11.12.2005, 11:59

jll wrote:It's a big challenge, M42 is more complex :?
I tried some meshes but the result wasn't as good as i expected :cry: (especially from a side point of view)Well, ... i'll must test other meshes ... :wink: If you like nebula, i uploaded some others on motherlode some time ago. (Helix, M57, NGC 3132, Eta Carinae, MZ3, He2-104) Bye Jll

I understand that diffused nebulae like M42 are much more difficult than the planetary ones, but I'm sure that in a close future Chris, Fridger, Toti and someone else will allow a different nebulae rendering, more realistic for nebulae like M42. :wink:
BTW, I have all your nebulae, and I love M57 and Helix. :D
Thank you.
Bye

Andrea :D
"Something is always better than nothing!"
HP Omen 15-DC1040nl- Intel® Core i7 9750H, 2.6/4.5 GHz- 1TB PCIe NVMe M.2 SSD+ 1TB SATA 6 SSD- 32GB SDRAM DDR4 2666 MHz- Nvidia GeForce GTX 1660 Ti 6 GB-WIN 11 PRO

ElChristou
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Post #5by ElChristou » 11.12.2005, 12:41

Hello Jll,

As I see you are still working on more nebulaes, I want you to test this pseudo addon based in your last one (rcw79). The purpose was more transparent textures, and I think the result is not bad (I have placed it in an arbitrary location for the stars/MW background with some more fictitious stars for a nice effect when you go through). Note I have done some color change, this because my LCD, so don't worry about that.
Now as always, the side view is bad, bad, bad... but there is nothing to do.

Download -> Neb (2.5mo)

What do you think of it?
Last edited by ElChristou on 12.12.2005, 00:21, edited 1 time in total.
Image

Topic author
jll
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With us: 22 years 10 months

Post #6by jll » 11.12.2005, 22:42

Nice indeed (even if I prefer more colorful nebula :wink: )

As I'm not an astro-expert I don't know where is the truth :
does nebula texture needs to be as transparent as your test or not ?

Any advice out there ?

May be the best way will be to define mesh with numerous very transparent "layers" ?

Perhaps we would gain on various aspects :
- more gas effect
- to make the structure less visible from side view
- the colors would be obtained by addition of the various layers

On the other side :
- add-ons are heavier
- more complex to define (need to split texture into different component)

I tried this in M42 and M27 (with only 2 layers but without very transparent texture) : it's not so pretty :( ,
and with your transparent texture (from a previous post) with 3 layers (a smaller mesh inside and bigger outside the main mesh ... again I wasn't satisfied :(

Well, the world wasn't made in 1 day ! :wink:

So I go on my way ...

Bye
Jll
AMD Ath1800+ 512mb : Nvidia GeForce6200 AGP 256mb

WinXPPro:FS1280x1024x32:

Celestia 1.4.1:Earth 4Kdds:Clouds 4Kdds:Night 4Kdds:Moon 4kdds:Galaxy ON

ElChristou
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Post #7by ElChristou » 12.12.2005, 00:19

jll wrote:...May be the best way will be to define mesh with numerous very transparent "layers" ?

Perhaps we would gain on various aspects :
- more gas effect
- to make the structure less visible from side view
- the colors would be obtained by addition of the various layers

Yep, that's it; your third point will not be easy to control but I think a serious try could be done :wink:

jll wrote:...On the other side :
- add-ons are heavier
- more complex to define (need to split texture into different component)

I don't think the size is a big problem if the work is really nice and yes, the work on the texture need some special attentions in that case...

jll wrote:...I tried this in M42 and M27 (with only 2 layers but without very transparent texture) : it's not so pretty Sad ,
and with your transparent texture (from a previous post) with 3 layers (a smaller mesh inside and bigger outside the main mesh ... again I wasn't satisfied Sad...


The main problem is those nebula are a volume, so trying to create a real 3D representation will not be possible using only 2D picture. We generally only have 1 point of view, so no one can say how will look X or Y nebula from 90?° left, right, up or down... I think there is a big part of interpretation so the final product will never be really accurate; now how you will work will depend on what exactly you want to do. If you want an accurate view then IMO it won't be possible with the actual possibilities; if you want to create some nice personal interpretation based on the reals documents, then trying with the above points can result in some nice addons. In that case, I think you should try not to use the same texture on the meshes to avoid some irrealistic "double views" of this texture, and use your imagination to create the rest of the meshes...
I think the result is good when you go through the nebula and have a nice 3D effect...

If I have some time (quite hard for now), I will do more test to give you (if I can) some ideas for this hard task :wink:

Bye.
Image

Topic author
jll
Posts: 64
Joined: 12.06.2002
With us: 22 years 10 months

Post #8by jll » 14.12.2005, 00:05

Hi all,

Some additional test about multi-layered transparent mesh around M1.
With an external one with red and yellow part and inner part with blue-grey cloud and a decreased limunosity.

Face vue seem good (except "double views" sorry ElChristou, it's late and I to tired to do additional work now :wink: )
Image

Side view ... :?
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Inside view 8O
Image

Well, I will add more layers, but my PC seems to be short in memory with this mesh and texture (512 Mo is not enouth :cry:)

Have a pleasant trip around beta M1 (12.5 Mo ...).
http://j.leboutet.free.fr/celestia/models/M1_CrabNebula_3D.zip

Jll
AMD Ath1800+ 512mb : Nvidia GeForce6200 AGP 256mb

WinXPPro:FS1280x1024x32:

Celestia 1.4.1:Earth 4Kdds:Clouds 4Kdds:Night 4Kdds:Moon 4kdds:Galaxy ON


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