Bits are always like this in each column : $0, $1, $2, $4, $8..
so, after $08 it is $10... and so on. (since each hex column is a set of 4 bits)
The default is probably quicker, yes. The ability to define your own, is useful of course if you want to apply your own special collision handling.
I think the difficulty is understanding how the different flags and groups interact. Hopefully, now that the example works as it should, you can see what all the flags/groups do.
so, after $08 it is $10... and so on. (since each hex column is a set of 4 bits)
The default is probably quicker, yes. The ability to define your own, is useful of course if you want to apply your own special collision handling.
I think the difficulty is understanding how the different flags and groups interact. Hopefully, now that the example works as it should, you can see what all the flags/groups do.