gkaefer wrote:sometimes its inpossible to get the pano alligned on horizon very well.
taf wrote:sorry for the French text, but i can't explain in english :
Je profite de ce post pour préciser une petit chose sur l'horizon... car j'ai eu recemment des panos à faire avec pas mal de ces pb.
Sur le cas de panos fait sans pied, et donc sans tete pano, il faut que les photos soient recollées avec des points de contrôles qui ne soient pas sur le premier plan, sinon, c'est l'horizon KO assuré !!! Plus les points de contrôle sont situés sur des objets loin sur l'horizon, plus celui ci sera parfait lors de l'assemblage final (au risque bien sur d'avoir des gros pb de parallax au premier plan, mais bon, on peut pas tout avoir non plus... forcement, à main levé !!!)
autopano a tendance à placer des série de points de contrôle en vertical, alors que le mieux, pour les pb d'horizon, c'est de les placer en horizontale, et forcement le plus près de l'horizon (donc pas en bas de la photo en général)...
Une petit option, dans les regles de détection, du genre "améliorer l'horizon", qui forcerait les points de controle sur le haut de la photo, et en horizontale, plutôt qu'en vertical, ferait que cela améliorerait pas mal la construction du pano...
I take this post to clarify one small thing on the horizon ... because I recently had to make panos with a lot of these points.
The case of panos done without foot, and therefore no pano head, must be glued together with photos of control points that are not in the foreground, otherwise it is the horizon KO guaranteed! More control points are located on far objects on the horizon, the more perfect will be in the final assembly (at the risk of having very large parallax bp in the foreground, but hey, we can not just have not ... necessarily, hand raised!)
autopano tends to place the set of control points in vertical, while the better for the horizon bp is to be placed horizontally, and obviously the more close to the horizon (not the bottom of the general picture) ...
A small option in the detection rules, such as "improve the horizon," which would force checkpoints on top of the photo, and horizontal, rather than vertical, it would improve a lot construction the pano ...
Artisan S. wrote:Naah, George....Mars has Olympus Mons.....about 26 Km high if memory serves....and the Netherlands has in fact not one but two highest points, Mount Scenery wich is 877 meters high (and located on the Caraïbian island of Saba which is has the same legal status as any town in Holland now) and the Vaalser Berg which is 323 meters high and on mainland the Netherlands....in fact about 70 km south of where I'm living.
Have you tried the multiple vertical technique btw.....?
Artisan S. wrote:And Klaus is (as sometimes is verry much the case) right.....I haven't had problems I could not solve.....but NASA should send Klaus to Mars (and back again) instead of a robot with the intelligence of a dungbeatle....this is what Nasa made of it:
So maybe they could send their next probe to Klaus in order for him to teach it, patiently the fine art of panorama shooting.....
klausesser wrote:Using the vertical-lines tool for horizontal correction resulted in this: http://360impressions.de/Tower/
So donÂ´t tell me thereÂ´s no horizontal correction in AP . . . :cool:
I can look for more examples if you like . . .
klausesser wrote:really - i donÂ´t understand that demand for a "automatic horizon"! An "automatic horizon" is impossible - there are too many ways to do a faulty shooting.
My suggestion: just use your camera/head levelled and you for sure get a straight horizon. Period.
Beside of that: there already is a fine working horizon-tool in Autopano for years . . . . .
IF this tool doesnÂ´t get you a straight horizon thereÂ´s something basically wrong in the shoot - and thatÂ´s not the stitcher . . .
In more than 6 years of using Autopano now i !never! had any problem to get a horizon straight. When there was something not correctly levelled it was MY fault.
Artisan S. wrote:I admit that is a problem indeed.....no CP's is no guidance.....and for those cases a horizon tool would be nice.....but I wonder, wouldn't there be controlpoints in the coulds and since these tend to move couldn't they be the culprit?
gkaefer wrote:This horizontal tool exists but not for spherical projection.
leifs wrote:In this type of horizon (inland, hills and mountains, buildings close to the horizon) there is no problem. Need no more examples.
The problem is for example when there is a line-horizon and there are water below and sky above: no CP's
It always result in a banana-shape horizon, and never a bump upwards.
(and yes: I use the XML's from the VRdrive2)
klausesser wrote:there must be something incorrect in your shooting, sorry.
klausesser wrote:The stitcher only comes in when you optimize the stitch.
a a gruntpuddock wrote:Have you tried adjusting the center point of the image?
I sometimes get this on long panos, even using a tripod but a bit of adjustment usually gets ridof mostt of the curvature.
leifs wrote:klausesser wrote:The stitcher only comes in when you optimize the stitch.
Have you shot a 90 images sphere, placed the images according to the XML and rendered it without optimizing ?
I've tried it, using "correct shooting" technique, and the XML from the VRdrive2.
leifs wrote:Verdict: the result is ugly. the pano has to be optimized.
leifs wrote:that's when the horizon-problem appears. I correct it, optimize and the problem just appear another place on the horizon. Like chasing rabbits.
leifs wrote:For the past seven years there has been a continuous, humble request for a new tool/better tool to manually help APG to produce a straight horizon (without steps). The automatic horizon tool is no option for theese cases, it just don't work.
There is a horizontal line tool in APG, but it's only available in planar projection! No help for cylinders and spheres.
klausesser wrote:There already is a vertical/horizontal tool which does fine with spheres indeed . . . . :cool:
leifs wrote:It solves a problem one place and create steps another place on the horizon.
Read this post for what this horizon tool would look like.
Alexandre himself said that it would be easy to do. This was 3 or 4 years ago... and nothing ever happened.
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