I wanted to give a quick context before jumping into the question.
Street art in Amsterdam is at danger.
An entire neighborhood will be renovated and entire buildings and graffiti made by world famous street artists will be demolished and lost forever.
My task is to try to preserve them. The initial plan was to use 360 pictures but after stumbling upon Meshroom I think photogrammetry could be a viable option. The caveat: I know nothing about 3D modeling
Let’s go to the question: Yesterday I tried making a test in my backyard and after drawing on a wall with some chalk i took RAW pictures with my DSLR (Canon 200D, f 11, iso 200, 18 mm). I took 191 pictures with some enphasis on the 2 trash bins you see on the left.
Fragment of a 360 picture i took:
The problem is that my PC got stucked for more than 8 hours on the meshing step ( I have an i7 6700K, GTX 1070 with 16GB of RAM). I think i took too many photos for such a small area and my question is: how many pictures would i roughly need to get a decent scan? Are we in the range of 20, 50, 100 or 200?
I know the rule of the 66% overlap, but given that i am shooting with a pretty wide angle lens i could tehcnically take just 20 pictures…
Any help would be really appreciated!