Photomodeler 3dConstructor, and Geometra work prety much the same as far as photo to 3d is conserned.photomodelerhas a whacky camera setup that i had a hard time getting setup in the demo verson which is no more.found a e-mail from them and figured id try the demo again to see if anything had changed and thats what i found when i went to downloads.hope it works perty good on those 40+year old railroad books that i have been wanting to get the structure photos converted to some form of 3d for years.(other than a "oh gee that might look like what it was.