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Astrophotography and Sketching >> Sketching

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Jef De Wit
Carpal Tunnel

Reged: 03/06/09

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?

Post Extras:

idp
sage

Reged: 08/21/09

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
Postmaster

Reged: 06/18/08

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.

Post Extras:

kraterkid
Post Laureate

Reged: 03/07/05

Loc: Jacumba, California

Re: Sketching in 3D? new

[Re: GlennLeDrew]
#3288205 - 08/22/09 08:10 PM Attachment (86 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:

Post Extras:

JimPie
professor emeritus

Reged: 11/10/07

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.

Edited by JimPie (08/23/09 12:27 AM)

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Jef De Wit
Carpal Tunnel

Reged: 03/06/09

Loc: Hove, Belgium

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!

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frank5817
Postmaster

Reged: 06/13/06

Loc: Illinois

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

Post Extras:

idp
sage

Reged: 08/21/09

Loc: New Haven, CT

Re: Sketching in 3D? new

[Re: kraterkid]
#3288935 - 08/23/09 09:38 AM Attachment (71 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

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Dee
scholastic sledgehammer

Reged: 03/12/06

Loc: Ireland

Re: Sketching in 3D? new

[Re: idp]
#3289282 - 08/23/09 01:30 PM Attachment (69 downloads)

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
scholastic sledgehammer

Reged: 01/21/08

Loc: Maryland

Re: Sketching in 3D? new

[Re: Dee]
#3289846 - 08/23/09 07:22 PM Attachment (68 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.

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TenthEnemy
scholastic sledgehammer

Reged: 01/21/08

Loc: Maryland

Re: Sketching in 3D? new

[Re: TenthEnemy]
#3289933 - 08/23/09 08:05 PM Attachment (75 downloads)

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

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JayinUT
I'm not Sleepy

Reged: 09/19/08

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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jcrew
sage

Reged: 08/07/08

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

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Jef De Wit
Carpal Tunnel

Reged: 03/06/09

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

Post Extras:

TenthEnemy
scholastic sledgehammer

Reged: 01/21/08

Loc: Maryland

Re: Sketching in 3D? new

[Re: Jef De Wit]
#3291561 - 08/24/09 04:30 PM Attachment (75 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.

Post Extras:

Jef De Wit
Carpal Tunnel

Reged: 03/06/09

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!

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Jef De Wit
Carpal Tunnel

Reged: 03/06/09

Loc: Hove, Belgium

Re: Sketching in 3D? new

[Re: Jef De Wit]
#3293618 - 08/25/09 04:36 PM Attachment (66 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...

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

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Jef De Wit
Carpal Tunnel

Reged: 03/06/09

Loc: Hove, Belgium

Re: Sketching in 3D? new

[Re: Jef De Wit]
#3293626 - 08/25/09 04:39 PM Attachment (61 downloads)

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

Post Extras:

starquake
sage

Reged: 02/02/08

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.

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

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starquake
sage

Reged: 02/02/08

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.

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

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