So, I've been trying to figure this out and have come up empty. So maybe you guys can assist me here.

For this scenario, I cast improved invisibility on a car. For being an Advanced object, that requires 4+ hits on the spellcasting roll. If I achieve those 4 hits, does it also mean that those 4 also count towards a spell resistance roll? Or is it anything above those 4 hits required for the threshold? If the 4 hits aren't counted, then casting improved invisibility seems exceptionally difficult or painfully worthless.

Also, what is rolled to resist the effects of improved invisibility?


TIA
-Lago

Force caps total hits.

You need a number of net hits equal to the object resistance of an observing object for it to not see you. Your net hits are your hits rolled in excess of the threshold of the object you are casting it on.

So making a car invisible to enemy drones is really hard, you need 7 hits (and a Force 7 spell). Making a person invisible to drones is merely kind of difficult, needing 4 hits.

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One of the things that is different about the way Shadowrun´s rules are set up, is that rules that apply to several things are mostly not repeated but mentioned once. So when your looking for how area effect works for a specific spell, you should be looking at how it works for all spells, and when your looking for what to use for resisting a specific illusion, you should be looking at what is said about all illusions. It´s a bit less user friendly than having everything you need to know in the spell discription, I know.

As for object resistance, it replaces the resistance roll that all involontary targets get. Resisted spell tests are treated as opposed tests, and thus the object resistance is sutracted from your hits. Objects resist being made invisible, so they get less invisible if you succeed.