se compio un attacco furtivo con un tocco del vampiro i danni bonus del furtivo li guadagno come pf temporanei?

se compio un attacco furtivo con un tocco del vampiro i danni bonus del furtivo li guadagno come pf temporanei?

sì.

if a rogue delivered a sneak attack with the vampiric touch spell, would the extra damage from the sneak attack also give her extra hit points? And could the sneak attack dice allow her to exceed the maximum damage allowed by the spell?

Yes and yes. The spell simply says that you “gain temporary hit points equal to the damage you deal.” the spell doesn’t seem to care how you get to that value (empower spell, sneak attack, and so on), so a rogue who delivered 50 points of damage with vampiric touch would gain 50 temporary hit points. The maximum damage listed for the spell only applies to the damage gained by your caster level; it doesn’t take into account any other benefits the character might have, such as sneak attack damage.