[HN Gopher] Raytracing diamonds
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       Raytracing diamonds
        
       Author : pizza
       Score  : 75 points
       Date   : 2021-12-26 19:06 UTC (3 hours ago)
        
 (HTM) web link (11011110.github.io)
 (TXT) w3m dump (11011110.github.io)
        
       | gjsman-1000 wrote:
       | The math is sadly above my knowledge, but how cool!
        
       | seunosewa wrote:
       | I would have loved to see ray-traced images of diamonds tho.
        
       | rbobby wrote:
       | If you shine a laser into diamond centered and perpendicular to
       | the table face, the beam will be split and returned out of the
       | table to show a pattern of dots (some bright, some dim). The
       | pattern is unique to each diamond.
       | 
       | Gemprint.com uses this to fingerprint diamonds. You can see some
       | images of "gemprints" here: https://www.gemprint.com/light-
       | performance.html
        
         | herodoturtle wrote:
         | This is precisely the sort of randomly insightful comment I've
         | come to love from HN.
        
           | dylan604 wrote:
           | I agree. I actually found the GP link more interesting than
           | the posted link. Not that the original wasn't interesting.
        
         | cronix wrote:
         | I did something similar in college in the 90's, except using
         | cut crystals. One laser in, hundreds of beams out (faded, of
         | course). You know the kind of faceted crystal balls that some
         | people put in their cars and hang from the rearview mirror that
         | cast rainbows everywhere when the sun hits it. Looked cool with
         | a fog machine in the dorm.
        
         | Pulcinella wrote:
         | Looks similar to an X-ray crystallography diffraction pattern,
         | except that requires X-rays.
        
           | boxed wrote:
           | X-rays are just one frequency of light. You can use any.
           | 
           | Also you can use electrons to get electron crystallography
           | which is (arguably) more powerful as you can reform the
           | original image after, it requires WAY smaller crystals, can
           | see lighter atoms, and more.
        
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       (page generated 2021-12-26 23:00 UTC)