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Old 03-04-2010, 03:14 PM   #21
LemmingLord
 
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Default Re: Infravision vs. the Invisibility Spell

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Originally Posted by Kromm View Post
Magic doesn't care about your physics. It produces a big Doesn't Work field that blocks vision and Infravision "just because." The energy doesn't disappear. You don't cook in your own heat. Nothing like that happens. It's just that the mana starts interacting with the energy in some way that specifically and cunningly prevents others from ever detecting it. End of discussion.
I see by the extra page discussion so far that saying "End of discussion" didn't exactly end the discussion now did it? ;)
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Old 03-04-2010, 03:20 PM   #22
David Johnston2
 
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Default Re: Infravision vs. the Invisibility Spell

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Originally Posted by LemmingLord View Post
I see by the extra page discussion so far that saying "End of discussion" didn't exactly end the discussion now did it? ;)
Well of course it didn't. After all, nobody told us what happens when it's dark and an invisible person turns on a flashlight so he can see better!
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Old 03-04-2010, 03:27 PM   #23
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Default Re: Infravision vs. the Invisibility Spell

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Originally Posted by entitivity View Post
In GURPS Magic, the standard invisibility spell blocks infrared radiation (i.e., it states that "infravision cannot see [the caster]").

However, considering that most organisms produce plenty of heat, it would seem as though this would still leave tell-tale traces of heat. Just standing in one location might leave footprints, handprints, or a heat halo in the caster's location.

So, two questions:

1. How much and how obvious would such leakage be? (Do any of you have experience in thermal imaging?)

2. Was the design of the invisibility spell intended to prevent such leakage entirely? (That is, does it utterly block infrared radiation around the caster, somehow magically preventing the caster from inadvertently heating objects around him?)
The clear intent of those words is to say "Infravision does not spot an invisible person". Since almost all character races are warm blooded, and leave the heat signatures that would be spotted, your interpretation essentially would negate the restriction on the spell.

There is a word for this sort of thing.

The word is NO!
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Old 03-04-2010, 03:42 PM   #24
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Default Re: Infravision vs. the Invisibility Spell

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Originally Posted by Fish View Post
Ah, that's interesting! So if there are bright heat sources around, like a torch, it completely ruins the scale?
For a character with infravision, or for the camera? For the character, possibly - but note that shining a bright light in someones face also tends to screw up their definitions of "light" and "dark" as well, so that's nothing new.

Thermal imaging cameras do normalization in post processing. Humans use a restricted apature and chemical fatigue in the rods and cones to suppress overstimulation before it even hits the sensor.
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Old 03-04-2010, 03:43 PM   #25
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Default Re: Infravision vs. the Invisibility Spell

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Originally Posted by Lonewulf View Post
This is awesome.

Don't kill the cat girls. :)
Catgirls go to Valhalla so if God kills them they wake up the next day anyway.

;)
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