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] For more options, visit this group at http://groups.google.com/group/hugin-ptx
