Thank you both for your informative responses! I did indeed go overkill with the photos. I took 50 pictures. I figured it would reduce distortion, but hey I'm learning :P Next time I'll cut back.
So I sort of understand what you guys are saying how a 360 degree photo mapped to a flat surface has to have some distortion, but I guess I'm looking to minimize it as much as possible. Also, my final product wont be viewed as a flat image anyway. It will be in a virtual tour sphere. I found one example that illustrates what I am trying to achieve quite well. http://worldwidepanorama.org/worldwidepanorama/wwp608/html/DonHofstee-4721.html As you navigate around that photo, you can clearly see distortion. the farther from the center, the more it is stretched. That makes sense and I think is what you were getting at James. Yet in spite of this, all the bars, and boards and edges stay as straight lines. This is in contrast to my image where the roof of the building is markedly curved. I also couldn't find any seams in that photo. This is also shot in quite a confined space which is the conditions I will be shooting in most of the time. Could you guys clarify for me what is causing the curving? What could I do differently without adding seams to my image? On Jul 28, 6:54 pm, Henri Chevallier <[email protected]> wrote: > As James Legg said, it's impossible to view 360° at once without huge > distortions. But from that single image it's possible to use a program that > allows you to move that image left/right/up/down showing only eg 90° at > once. Then the distortions in the middle of the image won't be that bad and > you'll feel like you're where the photograph took the pictures. > > Maybe you should check other virtual tours to see what others were able to > achieve. > > Attached is a QTVR file of your picture that can be viewed on Windows with > the free DevalVR player > athttp://www.devalvr.com/paginas/productos/qtvr.html(should also work with > QuickTime). > > By the way, how many pictures did you use for your panorama? It looks like > you really used a lot (25 or something ; 10 would probably have been > enough). Also it might be better to take your picture in portrait mode to > get more vertical information (in that case you may need 15-20 pictures). > > > > > > On Wed, Jul 28, 2010 at 11:25 PM, James Legg <[email protected]> wrote: > > On Tue, 2010-07-27 at 18:09 -0700, [email protected] wrote: > > > I am currently trying to put together a 360 degree pano for a virtual > > > tour of a house. I am running into some troubles with strange and > > > excessive distortions. > > > > I am using hugin, and I can seem to get my photos to line up in a > > > straight fashion so that edges and lines are straight as they should > > > be, and not very bowed. As you can see here: > >http://tinypic.com/r/66jdc3/3 > > > The only projection that is guaranteed to keep all straight lines > > straight is rectilinear. However, it cannot be used with a large field > > of view. The middle of the projection becomes too small after about 120 > > degrees, and spanning 180 degrees or more is impossible. > > > Unfortunately, to get 360 degrees horizontally in one shot you will have > > to either accept some bending, or use multiple rectilinear projections > > side by side, which introduces extra corners in straight lines that > > cross the rectilinear projections. > > > The biplane and triplane projections in Hugin use two and three > > rectilinear projections placed side by side respectively. > > > You can also save multiple rectilinear images manually, and if you are > > careful with the field of view and rotation they will line up. For > > example use 4 rectilinear images with 90 degrees field of view > > horizontally, rotating the yaw by 90 degrees between each one. Indoors > > you might be able to get each wall of a rectangular room exactly in one > > rectilinear image. If you place the images side by side, the edges of > > the room should be straight but anything else in the room that crosses > > them will have an additional corner. > > > A cylindrical projection would keep vertical lines an the horizon > > straight, but bends all other lines. It will span 360 degrees > > horizontally. It has the same problem as rectilinear vertically, > > however. The image you linked to looks fine for a cylindrical > > projection. > > > The panotools wiki explains projections: > >http://wiki.panotools.org/Projections > > > -James > > > -- > > You received this message because you are subscribed to the Google Groups > > "Hugin and other free panoramic software" group. > > A list of frequently asked questions is available at: > >http://wiki.panotools.org/Hugin_FAQ > > To post to this group, send email to [email protected] > > To unsubscribe from this group, send email to > > [email protected]<hugin-ptx%[email protected]> > > For more options, visit this group at > >http://groups.google.com/group/hugin-ptx > > > > 66JDC3.mov > 146KViewDownload -- You received this message because you are subscribed to the Google Groups "Hugin and other free panoramic software" group. A list of frequently asked questions is available at: http://wiki.panotools.org/Hugin_FAQ To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/hugin-ptx
