09-09-2017, 03:25 AM | #1 |
Join Date: Apr 2015
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What if you replaced all cones with rods?
This is about vision, I am writing a novel and might also use this for a game at some point.
A character has a power that lets her transform her eyes to replace all the cones with more rods to sacrifice color vision in favor of night vision. We'll assume no neurology problems or anything from this. 1) How many levels of the Night Vision advantage would that be? 2) If she also added the eye-mirror thing into her eyes that a cat has, how would that affect things. Again we assume no compatability issues. 3) How would you stat this? Something like Night Vision X (Switchable, temporary disad: colorblindness) right? Edit: 4) What would this look like? |
09-09-2017, 05:10 AM | #2 | |||||
Join Date: Jun 2006
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Re: What if you replaced all cones with rods?
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The fact is human vision (and hearing and touch) are quite good as animals go, and smell isn't bad, particularly for the stuff primates specialize in - we're actually pretty amazing at smelling esters ("fruit flavors"). We tend to exaggerate how fantastic animal senses are. Quote:
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09-09-2017, 05:16 AM | #3 | |
Join Date: Apr 2015
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Re: What if you replaced all cones with rods?
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09-09-2017, 06:20 AM | #4 | |
Join Date: Sep 2004
Location: Canada
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Re: What if you replaced all cones with rods?
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Eyeshine is cool looking though, so if you want a character to have it and plausibly not have a permanent kinda blurry vision (which would be an interesting character flaw) you could wave your hands around with something about enhanced post-processing being done in the visual cortex. [1] They have other focal oddities caused by the slit pupil, and of course their muzzle forms a gigantic blind spot in their FOV (they use their whiskers to compensate for that). [2] Standard poodles are sight hunters, for example, and have better distance vision than cats, and don't have the slit pupil focal funkyness. But the long muzzle forms an even more gigantic blind spot.
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09-09-2017, 07:15 AM | #5 | |
Join Date: Jun 2005
Location: Lawrence, KS
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Re: What if you replaced all cones with rods?
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09-09-2017, 12:42 PM | #6 |
Join Date: Feb 2005
Location: Berkeley, CA
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Re: What if you replaced all cones with rods?
Basically zero, the night vision rules already assume in extreme darkness you're only using rods, so you've got maybe a factor of 2.
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09-09-2017, 02:06 PM | #7 | |
Join Date: Aug 2007
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Re: What if you replaced all cones with rods?
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UT already has image processing. It's hidden as a computer program on p.56. The Gurps rules are unhelpful in some respects. For example, if ever given a choice between equal levels of Acute Vision and Night Vision take the Acute Vision every time. It is twice as expensive but it's probably more than twice as useful. If it would be helpful to know, Bio-tech allows NV 2 to genetically normal humans and 5 for maximum biological modification. Acute Vision is 3 levels and 5 respectively. Tactical Shooting won't go for more than Acute Vision 2 though.
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Fred Brackin |
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09-09-2017, 02:28 PM | #8 |
Join Date: Jun 2006
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Re: What if you replaced all cones with rods?
Actually not. Acute Vision adds to your Sense rolls. Night Vision *negates penalties*. This is an important difference, Acute Vision doesn't do anything to reduce the penalties you suffer for combat in low light, Night Vision does. If your GM ever applies penalties for doing something in bad light, as many levels of Night Vision as he'll let you buy is almost a no brainer.
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09-09-2017, 03:09 PM | #9 |
Join Date: Jul 2014
Location: New Zealand.
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Re: What if you replaced all cones with rods?
A special effect that is obviously different between placental mammals and marsupial mammals is the colour of the light that is reflected when a light source is directed at the eyes. A subtle bit of flavour for a change to the structure if the eyes.
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09-09-2017, 03:26 PM | #10 |
Join Date: Feb 2005
Location: Berkeley, CA
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Re: What if you replaced all cones with rods?
It's twice as expensive and less useful. Keen eyes is effectively +1 perception (visual). Night vision is effectively +1 DX and IQ, only in situations of partial darkness.
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basic, science, vision |
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