iltriumph
Posts: 34
Location:
Registered: 9 Oct 2008
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Please help
Posted: 9 Oct 2008 at 9:10 GMT
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Dear guys,
Why is it that sometimes our pano shots get curved in at the bottom?
Thank you
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Henri Smeets
Posts: 63
Location: Amsterdam, Netherlands
Registered: 28 Nov 2006
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Re: Please help
Posted: 9 Oct 2008 at 9:36 GMT
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That's because the time-space-continuum reflects you intentions upon the picture.... nah,
You mean Panoshots displayed as an equirectangular image like the ones you see in this header, that is the only way to display a 360 degree image, if straight lines remain straight the image would be infinitely long.
Have a look at the How-to section of this site to learn more on the technique.
www.panoguide.com/howto/
Or visit Panoramas.dk for more explanation on the subject.
Or explain exactly what you mean, like if you are already experimenting and have stumbled upon a problem. Let us know the equipment, workflow and software you are using.
Good luck.
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iltriumph
Posts: 34
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Registered: 9 Oct 2008
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Re: Please help
Posted: 9 Oct 2008 at 10:23 GMT
updated: 9 Oct 2008 at 10:26 GMT
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Hi Henri,
I have a picture to show but i don't know how to upload it 
So i guess my next question is how to upload a picture to be shown here
Thank u
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mediavets
Posts: 475
Location: Isleham, Cambs., United Kingdom
Registered: 8 Feb 2008
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Re: Please help
Posted: 9 Oct 2008 at 12:27 GMT
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This forum does not support uploading of photos.
You'd have to place your picture on the Web somewhere - one of the online phot sites is an option - and then place a link to it in your post.
The inability to upload images on this forum is a major weakness IMO. A photo-related forum to which one cannot upload photos - what is that about?
Andrew
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Henri Smeets
Posts: 63
Location: Amsterdam, Netherlands
Registered: 28 Nov 2006
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Re: Please help
Posted: 9 Oct 2008 at 13:49 GMT
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It looks like the input image was resized to hide the tripod and missing parts of the bottom of the panorama. You should leave the equirectangular image intact (2:1 aspect ratio) and edit the hole in the cubeface-fase with Photoshop
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Doug Aurand
Posts: 789
Location: Albuquerque, NM, United States
Registered: 2 Jan 2008
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Re: Please help
Posted: 9 Oct 2008 at 14:04 GMT
updated: 9 Oct 2008 at 14:05 GMT
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iltriumph
Henri is reight. The "viewer" is trying to cover the whole interior of the projection (a sphere or a cube), so it stretches what you give it to work with.
Intead of cropping out the part of the image with the tripod, you can convert to cube faces or a cubic strip, copy some of the surrounding area over the tripod or nadir hole on the bottom cube face or just use a tripod cap to cover the area, then convert back to an Equirectangular Projection
Good luck
Doug Aurand
www.VirtualAlbuquerque.com
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iltriumph
Posts: 34
Location:
Registered: 9 Oct 2008
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Re: Please help
Posted: 9 Oct 2008 at 14:56 GMT
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Hi Henri and Doug,
First of all, thank u Henri for helping me with the uplaoding of the photo. Very kind of u to trace me all the way to my email.
The attached picture was the bottom part of those 6 cubes converted from a rquirectangular already. The funny thing is that with the same setting for all my panos, sometimes i get a proper 'hole' at the bottom but other times it curves in like the one shown above.
Any idea?
Thank u guys
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mediavets
Posts: 475
Location: Isleham, Cambs., United Kingdom
Registered: 8 Feb 2008
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Re: Please help
Posted: 9 Oct 2008 at 15:02 GMT
updated: 9 Oct 2008 at 15:03 GMT
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iltriumph said: Hi Henri and Doug,
First of all, thank u Henri for helping me with the uplaoding of the photo. Very kind of u to trace me all the way to my email.
The attached picture was the bottom part of those 6 cubes converted from a rquirectangular already. The funny thing is that with the same setting for all my panos, sometimes i get a proper 'hole' at the bottom but other times it curves in like the one shown above.
Any idea?
Thank u guys
Which stitching program are you using?
What camera and lens are you using?
What pano head are you using?
What shooting technique do you use - eg. 6-around at zero pitch plus Z at +90 pitch?
Andrew
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Vilmer
Posts: 156
Location: Argentina
Registered: 23 May 2007
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Re: Please help
Posted: 9 Oct 2008 at 15:10 GMT
updated: 9 Oct 2008 at 15:12 GMT
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I have had this problem to, if you import your image in pano2vr, be sure to set it to 'equirectangular' instead of 'auto'. Pano2vr misinterprets every now and then..
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iltriumph
Posts: 34
Location:
Registered: 9 Oct 2008
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Re: Please help
Posted: 9 Oct 2008 at 15:11 GMT
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PTGui, D80 with 10.5mm and Nodal Ninja
7 shots, 6 around at -15 and Z at +90
Thank u Andrew
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iltriumph
Posts: 34
Location:
Registered: 9 Oct 2008
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Re: Please help
Posted: 9 Oct 2008 at 15:20 GMT
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Hi Vilmer,
Where can i turn off the auto setting? Is it in the tile size? If so, then what size should i set it to?
Thank u
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Hans Nyberg
Posts: 866
Location: Denmark
Registered: 28 Aug 2005
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Re: Please help
Posted: 9 Oct 2008 at 15:26 GMT
updated: 9 Oct 2008 at 15:30 GMT
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Unless you cropped the image manually PTGui should deliver a full 1/2 proportional equirectangular image from your setup.
Have you checked that PTGui is not placing controlpoints on the rotator.
With -15 you will get most of the rotator in the image.
This will confuse the optimizer and can give some weird results at nadir.
On a Nikon you should only need -10 to cover everything down to the edge of the rotator.
Hans
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Vilmer
Posts: 156
Location: Argentina
Registered: 23 May 2007
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Re: Please help
Posted: 9 Oct 2008 at 17:04 GMT
updated: 9 Oct 2008 at 17:12 GMT
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@ Andrew:
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Hans Nyberg
Posts: 866
Location: Denmark
Registered: 28 Aug 2005
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Re: Please help
Posted: 9 Oct 2008 at 17:24 GMT
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I did a check on the Pano2VR behaviour.
If you try to convert a pano which is missing a few pixels in height for the correct 1/2 proportions pano2VR believs it is a cylindric and makes a cylinder.
This is not the case here.
If you select equirectangular and imports the same file you will get a cubic pano which looks like iltriumph's
This is definitely a bug in Pano2VR. Pano2VR should not accept the file but report back that it is not an equirectangular panorama.
The question is how did he get a panorama with wrong proportions.
You can get it if you use auto stitching and give PTGui some files which does not have enough FOV for the zenith.
But this is not the case. He has a zenith image and PTGui should not crop that.
It may be that he has changed the output size without having the option for "Link width and height" booked.
Hans
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Vilmer
Posts: 156
Location: Argentina
Registered: 23 May 2007
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Re: Please help
Posted: 9 Oct 2008 at 17:35 GMT
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Hi Hans,
in fact, pano2vr did interpret some of my 2:1 pano's as cylindrical for some reason, with the same messed up nadir as described by Andrew. When I changed the 'auto' setting to equirectangular, the problem was solved. This has happened only a few times btw.
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