Manual Camera collision

Ok,i have a spring arm with a little socket offset,it makes line tracing the collision impossible(sphere trace with start as spring arm location and end as camera location)it always jitter,yeah i know spring arm have a “colision test”,but it’s not great in my case,also,i’ve found that increasing or decreasing the target arm length(camera zoom system) it’s the correct way.But how can i calculate it?
if i put 0 in the spring arm socket offset it work’s fine.but then i won’t have the “over the shoulder perspective”.
any help would be great

guys i have found a solution.put another spring arm with arm length of 0 and make it use "pawn control rotation"and in the other spring arm (that is child of the other spring arm)disable “use pawn control rotation” and put the desired offset in the child spring arm,but keep the child spring arm line straight.and if you want you can use the smooth collision technique

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