bruno021 opened this issue on Sep 14, 2005 ยท 9 posts
bruno021 posted Wed, 14 September 2005 at 5:48 PM
Hi all, Struggling to get a material right, I'd like to know if someone can point me to a link where I could get a list of refraction indexes of materials in the real world. What I'm trying to get is a semi transparent plastic material for a chair, and though it looks fine in C4D, it looks pretty bad in Vue. No maths, please, just figures!
Cheers posted Wed, 14 September 2005 at 6:00 PM
Attached Link: http://www.renderaid.com/infoDetail~p~d~id~1027~sid~1005~f~Resource.aspx
I think this should be enough for you ;) Found by me. Courtesy of Google ;) Cheers
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bruno021 posted Wed, 14 September 2005 at 6:07 PM
Now, thank you so much Cheers! No plastic though! Lol! Guess I'll have to try different settings for that!
bruno021 posted Wed, 14 September 2005 at 6:08 PM
Ok I need glasses, plastic's on the list!
Cheers posted Wed, 14 September 2005 at 6:13 PM
My pleasure, mate :) Cheers
Website: The 3D Scene - Returning Soon!
Twitter: Follow @the3dscene
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jc posted Wed, 14 September 2005 at 7:26 PM
Notice that the most dense common (well, not so very common) transparent material, diamond, has the highest index of refraction. meaning the it bends light the most because the speed of light through diamond is the slowest.
And the index of refraction is relative to the speed of light in a vacuum, but the speed in air is pretty close to the same.
I was wondering what it was that makes the index of refraction different for different frequencies (causing rainbows and such). A gentleman at the alt.sci.physics newsgroup informed me that materials have a frequency dependent electric "resistivity" and magnetic "permeability". Light being electromagnetic energy is therefore affected.
I've know for a long time that light is EM radiation, but never before knew an example of it acting "electric". An "aha" moment for the geek in me.
Message edited on: 09/14/2005 19:28
jb11 posted Thu, 15 September 2005 at 4:14 AM
That's a useful list.
Burrowing around the web (looking for an index for wine - anyone know? - I never found it), I made a note of a few others that I came across. Might be useful to somebody so I'll post them. I can't vouch for their accuracy (I'm no natural scientist), but they came from optics/physics/materials science sites.
salt (sodium chloride) 1.54
ashphalt 1.635
flint 1.7-1.98
lead 2.6
sea water 1.341-1.36
vinegar 1.305
malachite 1.655
Jane
bruno021 posted Thu, 15 September 2005 at 4:49 AM
Now salt and vinegar are pretty useful, jb!!! In a salad, that is! lol! Interesting though that sea water has a higher index than unsalted one.
jc posted Thu, 15 September 2005 at 11:28 AM
I bet wine is close to vinegar. These indexes are interesting, and might be a good starting place, but i sure would change them if they didn't look right, lol. Poetic license, art and all that - unless you are making a physics simulation.