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Astrophotography and Sketching >> Sketching

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Jef De Wit
Carpal Tunnel


Reged: 03/06/09
Posts: 2234
Loc: Hove, Belgium
Sketching in 3D?
      #3284224 - 08/20/09 03:41 PM

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
Lunt LS35THa, Eden XP 8x42, 6 cm 60's Towa, WO Zenithstar 80 FD & Orion Optics UK 30 cm Dobson
"Bright skies aren't empty skies" (James Mallaney)
My best solar system sketches
My deep sky sketches


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idp
sage


Reged: 08/21/09
Posts: 302
Loc: New Haven, CT
Re: Sketching in 3D? new [Re: Jef De Wit]
      #3287968 - 08/22/09 05:03 PM


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
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Reged: 06/18/08
Posts: 6562
Loc: Ottawa, Ontario, Canada
Re: Sketching in 3D? new [Re: idp]
      #3288005 - 08/22/09 05:34 PM

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 and modified binoculars
Mallincam VSS+

My Gallery (mostly DIY stuff) **UPDATED Feb 7 2013**

Simple minds discuss people. Good minds discuss events. Great minds discuss ideas. - Hyman Rickover



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kraterkid
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Reged: 03/07/05
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Re: Sketching in 3D? new [Re: GlennLeDrew]
      #3288205 - 08/22/09 08:10 PM Attachment (87 downloads)

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:

Attachment

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Rich



My CN Gallery




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JimPie
sage


Reged: 11/10/07
Posts: 474
Loc: S.E.Michigan
Re: Sketching in 3D? new [Re: kraterkid]
      #3288547 - 08/23/09 12:25 AM

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
Carpal Tunnel


Reged: 03/06/09
Posts: 2234
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Re: Sketching in 3D? new [Re: JimPie]
      #3288839 - 08/23/09 07:48 AM

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!

--------------------
Clear skies
Lunt LS35THa, Eden XP 8x42, 6 cm 60's Towa, WO Zenithstar 80 FD & Orion Optics UK 30 cm Dobson
"Bright skies aren't empty skies" (James Mallaney)
My best solar system sketches
My deep sky sketches


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frank5817
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Reged: 06/13/06
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Re: Sketching in 3D? new [Re: Jef De Wit]
      #3288887 - 08/23/09 08:50 AM

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
sage


Reged: 08/21/09
Posts: 302
Loc: New Haven, CT
Re: Sketching in 3D? new [Re: kraterkid]
      #3288935 - 08/23/09 09:38 AM Attachment (72 downloads)

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

Attachment


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Dee
scholastic sledgehammer


Reged: 03/12/06
Posts: 806
Loc: Ireland
Re: Sketching in 3D? new [Re: idp]
      #3289282 - 08/23/09 01:30 PM Attachment (70 downloads)

For some time now I have been considering doing a painting of this Lunar Anaglyph for interest and fun.

Dee

Attachment


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TenthEnemy
scholastic sledgehammer


Reged: 01/21/08
Posts: 904
Loc: Maryland
Re: Sketching in 3D? new [Re: Dee]
      #3289846 - 08/23/09 07:22 PM Attachment (69 downloads)

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.

Attachment

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Orion XT10
Bushnell Ares 6
Coronado PST
15x70 binoculars


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TenthEnemy
scholastic sledgehammer


Reged: 01/21/08
Posts: 904
Loc: Maryland
Re: Sketching in 3D? new [Re: TenthEnemy]
      #3289933 - 08/23/09 08:05 PM Attachment (76 downloads)

Here's a much better one, done in MS paint by simply moving stuff around on one side.

Attachment

--------------------
Orion XT10
Bushnell Ares 6
Coronado PST
15x70 binoculars


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JayinUT
I'm not Sleepy


Reged: 09/19/08
Posts: 2903
Loc: Utah
Re: Sketching in 3D? new [Re: TenthEnemy]
      #3290064 - 08/23/09 09:11 PM

Wonderful affect and it works but I can't hold it long. It literally makes my stomach upset.

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Thanks,

Jay

My Observing Blog

My Sketches

Scopes: XT10, 14" Dobstuff Strut w/Zambuto,
EPs: Pentax XW's, a few ES, a couple of TV's and a few others

"I believe in the pursuit of happiness. Not its attainment, nor its final definition, but its pursuit." Andrew Sullivan.


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jcrew
sage


Reged: 08/07/08
Posts: 392
Loc: Mechanicsville, VA.
Re: Sketching in 3D? new [Re: JayinUT]
      #3290148 - 08/23/09 10:03 PM

Is anyone else laughing imagining all the people sitting at their computer going cross-eyed?

Brad

--------------------
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
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Jef De Wit
Carpal Tunnel


Reged: 03/06/09
Posts: 2234
Loc: Hove, Belgium
Re: Sketching in 3D? new [Re: jcrew]
      #3291416 - 08/24/09 03:16 PM

Tenth Enemy, thanks for posting your 3D-sketches. Nice that it works for some, but not for me

--------------------
Clear skies
Lunt LS35THa, Eden XP 8x42, 6 cm 60's Towa, WO Zenithstar 80 FD & Orion Optics UK 30 cm Dobson
"Bright skies aren't empty skies" (James Mallaney)
My best solar system sketches
My deep sky sketches


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TenthEnemy
scholastic sledgehammer


Reged: 01/21/08
Posts: 904
Loc: Maryland
Re: Sketching in 3D? new [Re: Jef De Wit]
      #3291561 - 08/24/09 04:30 PM Attachment (76 downloads)

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.

Attachment

--------------------
Orion XT10
Bushnell Ares 6
Coronado PST
15x70 binoculars


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Jef De Wit
Carpal Tunnel


Reged: 03/06/09
Posts: 2234
Loc: Hove, Belgium
Re: Sketching in 3D? new [Re: TenthEnemy]
      #3293007 - 08/25/09 11:08 AM

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!

--------------------
Clear skies
Lunt LS35THa, Eden XP 8x42, 6 cm 60's Towa, WO Zenithstar 80 FD & Orion Optics UK 30 cm Dobson
"Bright skies aren't empty skies" (James Mallaney)
My best solar system sketches
My deep sky sketches


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Jef De Wit
Carpal Tunnel


Reged: 03/06/09
Posts: 2234
Loc: Hove, Belgium
Re: Sketching in 3D? new [Re: Jef De Wit]
      #3293618 - 08/25/09 04:36 PM Attachment (67 downloads)

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...

Attachment

--------------------
Clear skies
Lunt LS35THa, Eden XP 8x42, 6 cm 60's Towa, WO Zenithstar 80 FD & Orion Optics UK 30 cm Dobson
"Bright skies aren't empty skies" (James Mallaney)
My best solar system sketches
My deep sky sketches

Edited by Jef De Wit (08/25/09 04:37 PM)


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Jef De Wit
Carpal Tunnel


Reged: 03/06/09
Posts: 2234
Loc: Hove, Belgium
Re: Sketching in 3D? new [Re: Jef De Wit]
      #3293626 - 08/25/09 04:39 PM Attachment (62 downloads)

The original in 2-D is still better. 30 cm Dobson, magnification x92.

Attachment

--------------------
Clear skies
Lunt LS35THa, Eden XP 8x42, 6 cm 60's Towa, WO Zenithstar 80 FD & Orion Optics UK 30 cm Dobson
"Bright skies aren't empty skies" (James Mallaney)
My best solar system sketches
My deep sky sketches


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starquake
sage


Reged: 02/02/08
Posts: 254
Loc: Nádasdladány
Re: Sketching in 3D? new [Re: TenthEnemy]
      #3294729 - 08/26/09 03:02 AM

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.



--------------------
Ferenc Lovró

{ The observer | The scopes | The sketches }

Edited by starquake (08/26/09 05:48 AM)


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starquake
sage


Reged: 02/02/08
Posts: 254
Loc: Nádasdladány
Re: Sketching in 3D? new [Re: starquake]
      #3297085 - 08/27/09 04:50 AM

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.

--------------------
Ferenc Lovró

{ The observer | The scopes | The sketches }

Edited by starquake (08/27/09 04:51 AM)


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