IMTU, Jump masking and jump shadows of intervening objects don't count; your entry point and exit point ONLY matter. You can enter from within a shadow, but if your exit is within a shadow, you are displaced to the surface of said shadow. Masking only applies in as much as your destination might be inside the star shadow, the planet shadow, or in regina's case, the GG's shadow.
Vectors: IMTU, a vector CAN be retained, and it's related stellar and planetary positions (Ray from largest Jump shadow to second largest Jump shadow being the reference point for vector). Excess velocity is corrected by the jump-space travel.
But , to get a "Bingo Jump", one MUST have been goingin the right direction, and exit at the right point.
Vectors: IMTU, a vector CAN be retained, and it's related stellar and planetary positions (Ray from largest Jump shadow to second largest Jump shadow being the reference point for vector). Excess velocity is corrected by the jump-space travel.
But , to get a "Bingo Jump", one MUST have been goingin the right direction, and exit at the right point.