WALL O TEXT ALERT
nice. ive been looking into this stuff for a while now so ill pass along some infos ive got from googling and trial and error. SORRY IF THIS GOES LONG.
123 catch is alright but some of users don't like its blackbox nature and apparently it will limit the dimension of your image for bandwidth reasons(or whatever).
another alternative way to work is detailed here http://wedidstuff.heavyimage.com/ind...etry-workflow/
Open source and gives you a good idea of how photogrammety/sfm workflows work. but apperently there are restrictions on commercial use.
My favorite program for this sort of work is Agisoft Photoscan(Standard Edition)http://www.agisoft.com/features/standard-edition/
$189(pro edition has nice feature but price is a little high(lol) for what you get SE is good enough).
WARNING SOME STEPS MAYBE PERSONAL PREFERENCE and/or UNNECESSARY EXTREMELY W.I.P
now on to shooting (I use a sony a6000 and am not the world greatest photographer so please take these as guidlines only)
Drop your iso as low as you can in the lighting conditions(i'll drop it all the way to iso 100 if i can)
Drop down you aperture if you are able(again lighting conditions) ideally you want all your subject as sharp as can be(as little bokeh as you can get)usually between f4 and f8 works for me.
shutterspeed is more dependant on how you are taking the photos i take most of mine handheld so i need a slightly faster one to avoid motion blur(SHARP!SHARP!SHARP!) but slow would probably be better if you can stabilise(but since you have to go around the subject a tripod is probaly overkill, a monopod is probably my next purchase).
MAKE SURE THE SUBJECT IS IN FOCUS(this is OBVIOUSLY important)
Also if possible use a prime lense(i don't think photoscan(or any photogrammetry progam) can deal with images of different focal lengths)
Elimination of noise and blur the key goal when setting up camera settings.
Currently i'll circle the subject twice (trees, statue, rocks) taking 2 steps then reframing as much of the object(preferabley all) into the shot as possible.
usually end up with 30 to 40 shots. Keep in mind that there must be overlapping details for this to work and there may be parts you need take extra shots for(ie under the park table,to avoid gaping holes in the mesh). Usually anything that can be obscured by other objects needs this(ie legs, arms, tree branches). COVERAGE IS KEY
Also some things will absolutly not work with this method(Leaves,grass,Hair mainly stuff with insanely high detail)
If you want to just push the images into photoscan(or others) you can just use jpgs(but use the highest quality setting allowable(again noise is the enemy)). I personally use either RAW or RAW + jpeg(gives more options). jpeg will limit you to eight bit colour(not a problem with geometry building but the textures can be processed in 16bit or as HDRs(haven't tried this yet also))I to process the RAW images into 16 bit TIFFs and remove any stray noise(probably unnecessary but im still refining this part )
(IMPORTANT NOTE- Photoscan requires Exif data to process focal length, shutterspeed, etc, automagically so don't use programs or file formats that detroy this).
RTFM with photoscan its not long and will reveal all the steps and setting involved
Photoscan can take a long time to process the image for each part(beefy gpu and cpu with a nice amount of ram a must). MEDIUM QUALITY setting will probably be more than enough for most subject(unless you really have all day).
Still learning these parts but any mesh will require ALOT of clean up work at several stages.
Most meshes will be extremely dense and with horrible topology. but these are problems that many polycounters already have solutions for so. maybe look those up.
once thats done(relatively low poly mesh with good uvs,topology) you can re import and reproject photos onto the model in Photoscan so hooray
sorry for the long post but this is something ive been having fun with lately good to see some other polycounters are checking it out though(to be honest i probably need some people to bounce ideas off, doing it all on your own sucks). HAVE FUN GUYS
P.S. Ba should have read whole thread half of my infos already there oh well.