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Re: [dq-rules] Digest Number 209

I know about the vacation access problem. I may be gone for a week or so to take care of my father in the near future.
Where did the 'factor of 6' for cats come from? Are cats eyes generally able to see 6 times farther away than humans? Or is it that with altitude (sitting in a tree, etc) they have a less obstructed view. Perhaps just adding an extra value of, say, 6 to 20 hexes (depending on the size of the cat or other conditions) to their vision range would be more appropriate.
I have not studied night vision or IR goggle for a while, but it seems to me that the range of this type of apparatus is dependant more on the conditions (relative difference in size and temperature difference between heat source and background for IR and actual ambient light available (for scatter) and reflectivity of the target for night vision). Thus for IR a hot tank stands out from farther away because it is much hotter than its surroundings and is large. 

Anyway, just curious.


 >       2. Re: On Sights and Vision

            From: Martin Gallo <martimer@mindspring.com>

Martin:
Sorry for the delay in answering. I'm on vacation and it is hard to get a connection. To set the cat vision I just multiplied by 6 the values for human ranges. I took dusk as 10 hexes because dwarves see in the open as the human does at dusk (10 hexes) and decreased the ranges from there on. Also it is a way to limit the tactical display size on poor lighting conditions; 
remember that an average TMR is 4-5 hexes.
On the infravision debate, I'd like to make a remark. The IR goggles that are used by the military, don't have a range in excess to a handful of meters for natural sources of heat as a human being or an animal. They are used mainly to detect tank engines (that are a lot hotter), and also a lot of tanks that use IR sightings for their guns, also have IR lightsources that are used to illuminate the surroundings. To detect mansized targets, the military uses nocturnal light 
enhancers.
Best regards...     Arturo



 Message: 2
    Date: Sat, 17 Jan 2004 15:15:07 -0600
    From: Martin Gallo <martimer@mindspring.com>
 Subject: Re: On Sights and Vision

 Arturo,

 This is a VERY GOOD list. Thanks you very much!

 My only questions are about what you based your
 cat vision ranges on and the ongoing debate on
 whether infravision should have a longer range
 than regular vision.




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