Jef De Wit
super member
Reged: 03/06/09
Posts: 123
Loc: Hove, Belgium
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Talking about my hobby, a friend asked if it was possible to make a astrosketch in 3D? My first guess is a rotating planet. Or working with the red/blue-pair of glasses. Did anybody tried or succeeded?
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Clear skies, Jef De Wit
7x50 bino, Meade ETX-70 & Orion Optics UK 12" Dobson
"Bright skies aren't empty skies" (James Mallaney)
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idp
journeyman
Reged: 08/21/09
Posts: 6
Loc: New Haven, CT
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I am not sure if I understand what you exacly mean, but in the case of planetary objects you can definitely have a 3D appearance in some cases so I guess it makes sense to wonder what's the best way to give this feeling in a sketch. I think of the Moon in particular, and Saturn under certain conditions. I remember seeing it "popping out" of the eyepiece when both the shadow of the globe on the ring and of the ring on the globe were visible with good seeing.
I fear I am not a good artist enough to answer your question though, hope someone else here around is.
IDP
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GlennLeDrew
Pooh-Bah
Reged: 06/18/08
Posts: 1269
Loc: Ottawa, Ontario, Canada
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Jef,
I assume that you mean a *pair* of sketches which are representations as seen from two slightly different perspectives so as to yield a *true* 3-D appearance with suitable viewing apparatus.
If that's the case, then I can say that many, many years ago I experimented with simple perspective drawings that did result in very real depth perception when viewed either through lenses or via the crossed eye technique.
A more sophisticated astro sketch is indeed possible, but will take a bit of careful attention and time to execute.
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Home-made 11X50 right angle bino, 8.1 deg. FOV
Modified 26X100 bino, 3.5 deg. FOV
Home-made Mk II RA bino, using interchangeable objectives and eyepieces
My Gallery
Mediocre minds discuss people. Good minds discuss events. Great minds discuss ideas.
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kraterkid
Post Laureate
Reged: 03/07/05
Posts: 4550
Loc: Jacumba, California
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Jef, IDP and Glenn,
I used to play around with 3D effects the same way Glenn describes his experiences, generally by shifting the shadows though and not so much changing the perspective. Here's a drawing I just did that kind of demonstrates the technique. You must know how to do cross eyed viewing and concentrate on the center image:
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Rich
My CN Gallery
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JimPie
sage
Reged: 11/10/07
Posts: 229
Loc: S.E.Michigan
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Quote:
Jef, IDP and Glenn,
I used to play around with 3D effects the same way Glenn describes his experiences, generally by shifting the shadows though and not so much changing the perspective. Here's a drawing I just did that kind of demonstrates the technique. You must know how to do cross eyed viewing and concentrate on the center image:
Rich
 That hurts way too much.
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Jim
12.5",f=4.8 truss dob
EQ platform,24mm pan,14mm radian, vixen LVs
Edited by JimPie (08/23/09 12:27 AM)
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Jef De Wit
super member
Reged: 03/06/09
Posts: 123
Loc: Hove, Belgium
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Rich, thanks for posting the sketch. It's a good way to create 3D in a sketch. But I don't arrive to get the two immages to one... Although I succeeded to see 4 craters!! Special view too!
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Clear skies, Jef De Wit
7x50 bino, Meade ETX-70 & Orion Optics UK 12" Dobson
"Bright skies aren't empty skies" (James Mallaney)
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frank5817
Post Laureate
Reged: 06/13/06
Posts: 4084
Loc: Illinois
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Rich,
It works for me. It helps to put the tip of your index finger below and between the two images about 8 inches from your face to get your eyes to merge the images.
Very nice Rich.
Frank 
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my gallery
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idp
journeyman
Reged: 08/21/09
Posts: 6
Loc: New Haven, CT
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Quote:
Jef, IDP and Glenn,
I used to play around with 3D effects the same way Glenn describes his experiences, generally by shifting the shadows though and not so much changing the perspective. Here's a drawing I just did that kind of demonstrates the technique. You must know how to do cross eyed viewing and concentrate on the center image:
Excellent drawings and post. I wonder whether it would work the same for Saturn, for exemple by using sketches made at different times during the apparition, with slightly different breadths of the shadow and tilts of the ring. In situations like the one below I definitely happened to get a 3D felling.
IDP
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Dee
professor emeritus
Reged: 03/12/06
Posts: 738
Loc: Ireland
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For some time now I have been considering doing a painting of this Lunar Anaglyph for interest and fun.
Dee
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TenthEnemy
sage
Reged: 01/21/08
Posts: 428
Loc: Maryland
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This is really neat, here is my first attempt, done from a previous sketch of the ring nebula. I'm going to try some more by moving the stars around in some of my sketches on the computer.
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Orion XT10
70mm refractor
12x50 binoculars
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TenthEnemy
sage
Reged: 01/21/08
Posts: 428
Loc: Maryland
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Here's a much better one, done in MS paint by simply moving stuff around on one side.
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Orion XT10
70mm refractor
12x50 binoculars
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JayinUT
I'm not Sleepy
Reged: 09/19/08
Posts: 944
Loc: Utah
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Wonderful affect and it works but I can't hold it long. It literally makes my stomach upset.
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Jay in Utah
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Location: Lat: 40.514N Long: -112.032W
Mortal as I am, I know that I am born for a day. But when I follow at my pleasure the serried multitude of the stars in their circular course, my feet no longer touch the earth.
— Ptolemy, c.150 AD
My Blog
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jcrew
sage
Reged: 08/07/08
Posts: 386
Loc: Mechanicsville, VA.
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Is anyone else laughing imagining all the people sitting at their computer going cross-eyed?
Brad
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Orion EON80ed (the rider)
Orion Skyquest XT10i
Sirius EQ-G Mount (the horse)
Orion ST-80
Starshoot II Color CCD Camera
SSAG
40mm, 25mm, 10mm Plossl
13mm Hyperion
5mm TMB Planetary
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Jef De Wit
super member
Reged: 03/06/09
Posts: 123
Loc: Hove, Belgium
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Tenth Enemy, thanks for posting your 3D-sketches. Nice that it works for some, but not for me 
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Clear skies, Jef De Wit
7x50 bino, Meade ETX-70 & Orion Optics UK 12" Dobson
"Bright skies aren't empty skies" (James Mallaney)
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TenthEnemy
sage
Reged: 01/21/08
Posts: 428
Loc: Maryland
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To get these to work you should hold something like a finger or pen between the image any your eyes. Move the object in and out while focusing on it until the images merge in the background, now focus on the background while keeping your eyes crossed, remove the object if you need to. If you can't keep them merged just keep trying, your eyes should get used to it after a few tries.
If you back away from the screen it should be easier to get them to snap together and reduce any eye strain that you might experience because you won't have to cross your eyes as much.
I've got to stop making these, it's becoming addictive.
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Orion XT10
70mm refractor
12x50 binoculars
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Jef De Wit
super member
Reged: 03/06/09
Posts: 123
Loc: Hove, Belgium
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Tenth Enemy
I tried and tried, but maybe my eye-muscles are too rigid...
Addictive is one thing, but don't take the risk that your eyes will stay crossed forever!
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Clear skies, Jef De Wit
7x50 bino, Meade ETX-70 & Orion Optics UK 12" Dobson
"Bright skies aren't empty skies" (James Mallaney)
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Jef De Wit
super member
Reged: 03/06/09
Posts: 123
Loc: Hove, Belgium
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Hello
I tried all night long to make a (part of a) sketch 3-D. Put those special red/blue-pair of glasses on your nose. But like you will see... it doesn't work 
Although there is a psychedelic touch...
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Clear skies, Jef De Wit
7x50 bino, Meade ETX-70 & Orion Optics UK 12" Dobson
"Bright skies aren't empty skies" (James Mallaney)
Edited by Jef De Wit (08/25/09 04:37 PM)
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Jef De Wit
super member
Reged: 03/06/09
Posts: 123
Loc: Hove, Belgium
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The original in 2-D is still better. 30 cm Dobson, magnification x92.
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Clear skies, Jef De Wit
7x50 bino, Meade ETX-70 & Orion Optics UK 12" Dobson
"Bright skies aren't empty skies" (James Mallaney)
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starquake
member
Reged: 02/02/08
Posts: 172
Loc: Nádasdladány
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Wow, that's so cool! Those galaxies are really in the background! I have to try this technique too.
edit:
Ok, here's my first try:
M10 in 3D. It's not that perfect because it seems that some of the stars are behind the globular cluster, which is not possible.
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"At night astronomers agree." /Matthew Prior/
"Astronomers, like burglars and jazz musicians, operate best at night." /Miles Kington/
10x50, 114x900, 300x1500
My astronomical sketches: Graphite Galaxy
Don't take my words too seriously, I might be wrong. And sorry for my English.
Edited by starquake (08/26/09 05:48 AM)
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starquake
member
Reged: 02/02/08
Posts: 172
Loc: Nádasdladány
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I got the 3D fever.
M34 in 3D
btw, the key to create such 3d stereograms is that if you move a star to the right compared to the original, it will become a foreground star. if moving it to the left, it will become a background star. the more you move, the closer or farther it will be.
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"At night astronomers agree." /Matthew Prior/
"Astronomers, like burglars and jazz musicians, operate best at night." /Miles Kington/
10x50, 114x900, 300x1500
My astronomical sketches: Graphite Galaxy
Don't take my words too seriously, I might be wrong. And sorry for my English.
Edited by starquake (08/27/09 04:51 AM)
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