If we apply object resistance invisibility is very difficult to break as cars are highly processed objects.
However, in my opinion invisibility does not effect the van itself, but the mind of the viewers.
(the improved one is in the grey area of interpretation like too many parts of the rules)
From the book:
"Invisibility affects the minds of viewers. Improved Invisibility
mimics the subject’s surroundings from all angles
and affects technological sensors as well."
So the way I read this phrase is that the improved invisibility is a special case of trid that instead of creating a location based illusion creates an object base illusion as if the object is not there. I am not sure that object itself is effected in any way - but if you think it does I am all game
I know that the rules of this game are badly written and the fluff does not always effect the game mechanics and stuff like that.
I think that as a rule - illusion magic cannot effect the real world it is not effected by object resistance. not require object resistance.
another illusion spell that specifically designed to effect cars also do not mention the word object resistance in its description:
VEHICLE MASK
(REALISTIC, MULTI-SENSE)
Type: P Range: T
Duration: S Drain: F – 3
Vehicle Mask is a variant of Physical Mask (p. 291,
SR5) designed to mask the identities of vehicles and
drones. By touching the targeted vehicle, the spellcaster
creates an illusion that masks it to appear to be a completely
different vehicle of roughly the same size. In
addition to the visual mask, this spell affects the vehicle’s
sound, smell, and other identifiable characteristics.
Vehicle Mask can also modify a vehicle’s Signature (p.
184, SR5); each net hit scored by the caster can be used
to raise or lower the vehicle’s Signature modifier by 1.
The caster must be actively touching the vehicle being
In contrast, Manipulation spells do mention object resistance. (like the fashion spell in SG).
FASHION
(ENVIRONMENTAL, AREA)
Type: P Range: T
Duration: P Drain: F – 1
This spell instantly tailors clothing, transforming garments
into any fashion the caster wishes. The net hits
over the clothing’s object resistance (defense pool for
the clothing can be between 6 and 9, depending on the
complexity of the material and whether it interweaves
electronics into the threads) measure the degree of
style in the tailoring. The spell cannot change clothing’s
protective value, only its cut, color, pattern, and fit. The
weight of the clothing does not change, and it must cover
approximately the same amount of area (for example,
a jumpsuit can’t be converted into a bikini). The caster
must touch the clothing.
