Everything related to http://resources.maxwellrender.com
By JDHill
#169388
Not Complex IOR, but here's a link to a page with IOR values for many polymers (too many to print here): Here's a page with IOR values for many other materials: Thanks for all your work, hdesbois...you're a machine. 8)

~JD
User avatar
By hdesbois
#169401
Good info. Maybe we should start a thread with all links like these in the goodies section.
yellow green tourmaline

Image

Data from same soource as above.

Data:
4 415 725 62
1.658 0.00000402799
1.659 0.000003654
1.659 0.0000033065
1.659 0.00000296614
1.657 0.00000267525
1.656 0.00000239624
1.654 0.00000218851
1.653 0.0000019944
1.651 0.0000018837
1.65 0.00000182988
1.648 0.00000178281
1.647 0.00000174088
1.645 0.0000016929
1.644 0.00000164448
1.642 0.00000159565
1.641 0.00000155918
1.639 0.00000150678
1.637 0.00000146
1.636 0.00000142612
1.634 0.00000139434
1.632 0.00000135342
1.631 0.00000132184
1.629 0.0000012894
1.628 0.00000125822
1.626 0.00000124334
1.625 0.00000121716
1.623 0.00000120445
1.622 0.000001199
1.62 0.00000119658
1.618 0.00000120736
1.617 0.00000121814
1.615 0.00000122892
1.614 0.0000012397
1.613 0.00000126556
1.612 0.00000129168
1.612 0.00000133576
1.613 0.00000137207
1.614 0.0000014184
1.614 0.00000148346
1.615 0.00000154818
1.615 0.00000160884
1.615 0.00000164796
1.614 0.00000167625
1.614 0.00000167076
1.613 0.00000163449
1.612 0.0000016064
1.612 0.00000155961
1.611 0.0000015067
1.611 0.00000146196
1.61 0.00000140844
1.609 0.00000135527
1.609 0.000001307036
1.608 0.000001259415
1.607 0.000001210536
1.607 0.000001156417
1.606 0.000001109244
1.605 0.000001063211
1.605 0.00000102984
1.604 0.000000999408
1.604 0.0000009514
1.603 0.000000915486
1.602 0.000000896256
1.602 0.000000884645

S.L.: 19
Render Cost: LOW
Remarks: scale sensitive material
Last edited by hdesbois on Mon Jul 10, 2006 10:23 am, edited 1 time in total.
User avatar
By Tyrone Marshall
#169438
Hdesbois, can you elaborate on your process for getting these graphs into numerical input? We could give you a hand on some of these. I may need to adjust the scene for 1.1 - you can see there are some differences in lighting versus 1.0.
User avatar
By hdesbois
#169510
Hi,
Findgraph has a function to get numerical values from a graph. As I mentionned, with colored dielectrics, absorbance is much more important than refraction. I usefind graph to get absorbance values and interpolate them in the visible range. Then I multiply by wavelength in nm and divide by a big number (500000000 is a good start). Though there are formulas to convert absorbance to extinction coefficient, the results are sometime weird, probably due to unit mismatch (in some cases, you don't have any info about the sample thickness, so the formulas are useless). That's why I prefer to experiment by trial and error. For refraction, most of time, you cannot get accurate data at different wavelengths, so, I assume that the value you can find is ok near the minimum absorption, then i set it a bit higher at short wavelengths and lower near red. Just for fun, you can raise it near absorption maxima, but it hardly makes any difference at render time.
You can use illustrator to draw a graph, export as bit map and use findgraph to get numerical values: it's pretty fast. On the other hand, you can also make a non dispersive material and decide refraction is the same for all wavelength, since it's very unlikely to come by a scene where you would see dispersion trough a colored material.
I began writing a tutorial, but I hope this helps in the meantime.
HD
User avatar
By hdesbois
#170585
deep blue sapphire

Image



data extrapolated from:
http://www.gemresearch.ch/journal/No1/page20.htm

Data:

4 380 725 69
1.771 0.0000008385
1.771 0.000001436625
1.771 0.00000186105
1.772 0.0000018024
1.772 0.0000018
1.772 0.000002044425
1.772 0.0000022866
1.773 0.000002283525
1.772 0.0000020514
1.772 0.000001818
1.771 0.00000155775
1.771 0.000001312388
1.77 0.0000010662
1.77 0.000000813405
1.769 0.000000552675
1.769 0.00000033108
1.768 0.00000014187
1.768 0.000000000255
1.767 0.000000036255
1.767 0.000000227175
1.766 0.00000048936
1.766 0.00000083295
1.765 0.00000125004
1.765 0.000001690725
1.765 0.00000222825
1.764 0.00000276
1.765 0.0000033429
1.765 0.000003989775
1.766 0.000004632
1.766 0.0000053715
1.767 0.00000608355
1.768 0.0000068553
1.768 0.0000075828
1.769 0.0000083871
1.77 0.00000919575
1.771 0.000009941925
1.771 0.0000106656
1.772 0.00001096755
1.773 0.00001105005
1.774 0.000011019375
1.774 0.0000109074
1.775 0.0000107121
1.776 0.0000104049
1.776 0.00001003665
1.777 0.000009624
1.777 0.000009156975
1.777 0.00000867105
1.776 0.00000822135
1.776 0.0000080322
1.775 0.000007922625
1.774 0.00000783795
1.774 0.00000774075
1.773 0.000007698
1.772 0.000007604625
1.771 0.00000756675
1.771 0.000007487475
1.77 0.0000074451
1.769 0.00000735075
1.768 0.0000073038
1.767 0.00000725475
1.767 0.0000072138
1.766 0.0000071709
1.765 0.0000071778
1.764 0.000005984625
1.764 0.000005382
1.763 0.00000683175
1.762 0.00000699105
1.761 0.000006926175
1.761 0.0000068592
1.76 0.000006790125

S.L.: 19
Render Cost: LOW
Remarks: Material is scale sensitive. If it comes a bit too clear on gemstone sized object, use a spreadsheet to multiply the second column by 1.5 to 3 or 4.
User avatar
By Tyrone Marshall
#171564
Hdesbois, I have updated your collection.

Something changed with the exposure and your last few images, it may need to be set lower to match 1.0 versions.
User avatar
By hdesbois
#171659
Thailand ruby.
A more accurate version of ruby gemstone.

Image


Data:

4 380 725 69
1.788 0.000025268
1.789 0.000032433
1.789 0.000039146
1.79 0.000044198
1.79 0.000049
1.791 0.000053417
1.792 0.000056857
1.792 0.000058451
1.793 0.000057374
1.793 0.0000536575
1.794 0.000047683
1.794 0.000039767
1.793 0.000031212
1.791 0.0000234092
1.789 0.0000180875
1.786 0.00001419835
1.784 0.000010128
1.781 0.00000637115
1.778 0.0000042852
1.776 0.00000250125
1.774 0.0000016496
1.772 0.0000020905
1.771 0.0000035412
1.77 0.00000582455
1.769 0.000008885
1.769 0.0000128355
1.769 0.0000175886
1.77 0.0000230782
1.77 0.0000292816
1.771 0.0000359855
1.772 0.000042989
1.773 0.000050126
1.775 0.000057008
1.776 0.000063352
1.777 0.000068755
1.778 0.0000727445
1.78 0.000075
1.781 0.0000750215
1.782 0.000072806
1.783 0.000068295
1.783 0.00006172
1.784 0.000053381
1.784 0.000043826
1.784 0.0000340514
1.784 0.000024866
1.783 0.0000171782
1.781 0.0000117794
1.779 0.00000790505
1.777 0.0000052164
1.774 0.0000034375
1.772 0.00000227
1.769 0.00000151965
1.767 0.0000011072
1.764 0.00000080225
1.763 0.0000006855
1.761 0.0000008466
1.759 0.0000013778
1.758 0.000001556
1.757 0.0000016813
1.756 0.00000127325
1.755 0.0000011156
1.754 0.00000103595
1.753 0.0000025265
1.753 0.00000298045
1.752 0.00000227
1.752 0.00000175895
1.751 0.000001679
1.751 0.0000017177
1.751 0.0000016904
1.751 0.00000171175

S.L.: 19
Render cost: LOW
Remarks: scale dependant material. See: http://www.maxwellrender.com/forum/view ... 731#171731 to compare with the colour of a gemstone size object.
User avatar
By hdesbois
#173526
zinc.ior
(see tutorials section for details)
Image

data:

1 1.6 3 69
3.978 4.747
3.947 4.739
3.9115 4.7245
3.8835 4.706
3.8505 4.6675
3.8075 4.609
3.7675 4.5535
3.7345 4.5055
3.7055 4.4575
3.6745 4.41
3.639 4.364
3.5965 4.3205
3.5485 4.278
3.5015 4.2355
3.451 4.1945
3.393 4.1555
3.32 4.12
3.2115 4.0925
2.9685 4.083
2.6025 4.125
2.3885 4.1785
2.201 4.243
2.021 4.31
1.84 4.373
1.642 4.4185
1.2865 4.2565
1.16405 4.17
1.10905 4.1555
1.0644 4.153
1.0253 4.154
0.9895 4.154
0.95615 4.1505
0.92445 4.141
0.8947 4.1225
0.8661 4.091
0.8406 4.0445
0.81815 3.9865
0.79795 3.92
0.7794 3.8505
0.76175 3.781
0.7443 3.7155
0.72665 3.6555
0.7083 3.605
0.6888 3.563
0.66825 3.5265
0.64705 3.4945
0.6256 3.4655
0.6044 3.4395
0.58365 3.414
0.56385 3.3905
0.5452 3.367
0.52795 3.343
0.51235 3.3175
0.4987 3.291
0.48705 3.263
0.47715 3.234
0.4687 3.205
0.46145 3.175
0.4552 3.1455
0.44975 3.116
0.44485 3.0865
0.44035 3.058
0.436 3.03
0.43165 3.0025
0.4272 2.977
0.42245 2.9515
0.4174 2.9275
0.4121 2.904
0.4069 2.882
0.40185 2.8615

S.L.: 19
Render cost: LOW
Remarks: data is average between perpedicular and parallel to C axis (very little difference anyway).
User avatar
By hdesbois
#175457
red wine:

Image

data extrapolated from:
http://radio.weblogs.com/0101365/2003/04/23.html
(black swan shiraz)

data:

4 401 726 65
1.379 0.000008214441
1.379 0.000007772579
1.379 0.000007391269
1.378 0.000007138092
1.376 0.000007007985
1.375 0.000006991574
1.374 0.000007072362
1.373 0.000007167504
1.372 0.000007276173
1.371 0.000007412196
1.369 0.000007557535
1.368 0.000007719299
1.367 0.000007888304
1.366 0.000008077308
1.365 0.000008279835
1.364 0.000008504809
1.363 0.000008739877
1.361 0.000008986721
1.361 0.000009248556
1.36 0.000009503428
1.359 0.000009775064
1.359 0.000010048692
1.359 0.000010281352
1.36 0.000010462452
1.361 0.000010563852
1.361 0.000010603722
1.362 0.000010608975
1.363 0.000010541689
1.364 0.000010429093
1.365 0.000010224161
1.366 0.000009982308
1.366 0.000009674328
1.367 0.000009305331
1.368 0.000008877273
1.369 0.000008393943
1.37 0.000007895589
1.371 0.000007347223
1.371 0.000006802299
1.372 0.000006259404
1.371 0.000005708126
1.369 0.000005191776
1.367 0.000004689666
1.366 0.000004213377
1.364 0.00000374344
1.362 0.000003330508
1.36 0.000002942356
1.359 0.000002585428
1.357 0.000002237732
1.355 0.00000194385
1.354 0.000001681149
1.352 0.000001465892
1.351 0.000001267789
1.349 0.000001105355
1.348 0.000000979672
1.346 0.000000863046
1.345 0.000000781476
1.344 0.000000698603
1.342 0.000000628422
1.341 0.000000569785
1.34 0.000000514409
1.339 0.00000047542
1.339 0.000000432223
1.338 0.000000397535
1.337 0.000000368975
1.336 0.000000338895
1.336 0.000000319686

S.L.: 19
Render cost: LOW
Remarks: good material for a rather young dark red wine.
User avatar
By hdesbois
#188520
Thanks, and here is a new one:

spessartite (mandarine garnet):

Image

Image
1.91 0.00003149801
1.907 0.000030453092
1.904 0.000030354613
1.901 0.000027347751
1.898 0.000022882674
1.895 0.000017991166
1.893 0.000014709331
1.891 0.000014180126
1.889 0.000030034912
1.89 0.00006844851
1.893 0.00004916496
1.895 0.00004473736
1.898 0.0000422312
1.9 0.0000427512
1.903 0.000018737692
1.906 0.000008439513
1.907 0.000006349375
1.895 0.000007253665
1.88 0.000009774058
1.864 0.000012250888
1.848 0.000011484394
1.837 0.000010434732
1.837 0.000011626851
1.837 0.000013619356
1.838 0.000013427687
1.839 0.000010556583
1.84 0.000008272522
1.841 0.000007125472
1.839 0.000006984234
1.834 0.000006935353
1.83 0.000007455755
1.829 0.000008109429
1.83 0.000008710867
1.83 0.00000855297
1.831 0.000008047581
1.832 0.000007098652
1.832 0.00000590685
1.833 0.000004708157
1.832 0.000003786226
1.83 0.000002988351
1.828 0.000002521835
1.825 0.000002025748
1.823 0.000001686522
1.821 0.000001297845
1.819 0.000001074581
1.816 0.000000926117
1.814 0.00000087649
1.812 0.000000835817
1.81 0.000000594316
1.807 0.000000579738
1.805 0.000000515346
1.803 0.000000427234
1.801 0.000000356756
1.799 0.000000294922
1.797 0.000000244515
1.794 0.000000148207
1.793 0.000000286943
1.791 0.000000314418
1.789 0.000000342042
1.787 0.000000343405
1.785 0.000000436329
1.784 0.000000538426
1.782 0.000000595178
1.781 0.000000606229
1.78 0.000000652796
1.78 0.000000627282
1.78 0.000000599031
1.779 0.000000597413
1.779 0.000000655455
1.779 0.000000650129
1.778 0.000000639457
1.778 0.000000635578
1.778 0.000000596574
1.778 0.000000669247
1.777 0.000000572815
1.777 0.000000421521
1.776 0.000000428933
1.776 0.000000529261
1.776 0.000000622402
1.775 0.000000492263
1.775 0.000000494113
1.774 0.000000443392
1.774 0.000000401879
1.774 0.000000451703
1.773 0.000000582852
1.773 0.000000445188
1.772 0.000000494856
1.772 0.000000405702
1.771 0.000000499651
1.771 0.000000713695
1.77 0.000000500525
[/quote]


S.L.: 19
Render cost: LOW
Remarks: scale dependant material, shown here on a gemstone object.

HD
Last edited by hdesbois on Tue Oct 31, 2006 1:51 am, edited 1 time in total.
User avatar
By Tyrone Marshall
#190132
Elucidesign wrote:Thanks for the start on this valuable work... however the Scene file link seems to be broken. I would like to help adding some engineering coating renders, but want to maintain the consistency of the scene.

Sef.
Link is restored!
User avatar
By misterasset
#194758
[EDIT] Post taken down for techincal reasons. I'll put it back up after V1.2. Hopefully.[EDIT]
Last edited by misterasset on Sun Nov 12, 2006 7:55 pm, edited 1 time in total.
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