How to know if a moving 3d point has passed dest.

Let's say you have an object starting from pos0 and moving to dest0. How do you know if it has reached (or past) dest0 when at currPos?float lenToPos = vec3Length( currPos - pos0 );float totalLen = vec3Length( dest0 - pos0 );if( fabs(totalLen) <= fabs(lenToPos) ){// Reached or exceeded destination}