DO_SET_CAM_TRIGG_DIST=0 problem

What is the third parameter of DO_SET_CAM_TRIGG_DIST.
It always set to “1” when generate by “Auto WP”
It make wrong shutter distance and also loss some photo.
Everything OK when set it to “0” but very bad for large area.

How to permanent set it to “0” ?
Thank You
JK

Can you provide us with the parameter file and also the flight log. So that we can help.
Thank You