ikoframe at zoznam.sk
Sun Apr 3 13:51:39 CEST 2005
indeed it is not negative, if one ior was i_1 than for the opposite
direction the ior is i_2 = 1/i_1
it comes out from senll's law
On Sun, 2005-04-03 at 12:56 +0200, Frédéric van der Essen wrote:
> Of course it can !
> the ior isn't lightspeed_in_void / Lightspeed_in_material !!!
> this is the special case of an object standing in void.
> the real formula = lightspeed_in_first_material /
> if the light goes slower in the first than in the second, then the ior
> is smaller than one.
> in the case of a bubble in water, the lightspeed is slower in the water
> than in the air, so the ior is negative when the light
> enters the bubble, and positive when the light goes out the bubble.
> Daniel Barbeau wrote:
> >ior_of_material = Lightspeed_in_void / Lightspeed_in_material
> >Lightspeed_in_void is light's maximum speed. 300 000 km/sec If i
> >recall well.
> >Lightspeed_in_material can't be higher than Lightspeed_in_void, so
> >ior_of_material can't be lower than 1.
> >I guess this could be an Elysiun question and an Elysiun answer.
> >Bf-committers mailing list
> >Bf-committers at projects.blender.org
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