Thread

1. vermarish · 1785859472 · focus · HN ↗

   This is beautiful work! First, I thought this would involve using PCA to go from 3D to 2D, which would result in an easier selector to use, but at the expense of representing every person.

   Then, I thought this would stop at using the U-space vectors (the ones that form the basis of the PCA image) and their corresponding ellipse to form our color space, but no, the function fitting is a very slick idea, even if it was executed by hand.

   Lastly, I love the presentation of sampling from different r values. Whether you sample from a fixed r value or a range of r values, I bet this has great applications in game design or animation.

   I still don't quite get the manual data labeling process at the beginning? It seems like it would encode some bias, but the consistency of the first point cloud and the results certainly speak for themselves.

   1. dr_scully · 1785860437 · focus · HN ↗

      If you look at my doctoral thesis, in fact skin colour can be parametrised using melanin and haemoglobin concentration; which it means it is indeed (roughly) two dimensional. This allows you to invert the colour of a pixel and identify someone’s chromophore concentration. This is based on previous work of others cited in the thesis.

      <a href="https:&#x2F;&#x2F;discovery.ucl.ac.uk&#x2F;id&#x2F;eprint&#x2F;10093345&#x2F;" rel="nofollow">https:&#x2F;&#x2F;discovery.ucl.ac.uk&#x2F;id&#x2F;eprint&#x2F;10093345&#x2F;

      1. GolDDranks · 1785860788 · focus · HN ↗

         I&#x27;ve heard that the so-called &quot;yellowish&quot; skin color that non-tanned East Asians tend to have, is due to relative abundance of subcutaneous fat. If that&#x27;s true, is that captured by the haemoglobin dimension or is it a yet another degree of freedom?

         1. Joel_Mckay · 1785862874 · focus · HN ↗

            All skin is slightly translucent, and color&#x2F;tones forms a gradient across the surface of the skin. Your upper cheeks and forehead are usually slightly reddish, and the chin&#x2F;neck are slightly bluish.

            People only turn yellow if they have kidney or liver damage. However, some distinctive features like Lucy Liu&#x27;s natural freckles are tough to draw right.

            We looked around a lot for a procedural texture&#x2F;shader to help make the project characters look less sickly, and please also consider supporting the persons work if you are able:

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            Best of luck =3

            1. CITIZENDOT · 1785871143 · focus · HN ↗

               I didn&#x27;t know chin&#x2F;neck are slightly bluish, can we make it more explicit without side effects?

               1. Joel_Mckay · 1785873297 · focus · HN ↗

                  It is a classic artist starting off point to first drop a red&#x2F;blue gradient as a base mixing layer, and add skin details&#x2F;masks for each additional texture layer&#x2F;feature.

                  The &quot;The Ultimate Blender 3D Sculpting Course&quot; covers several sculpting techniques, and while this course has a number of challenges it does cover several basics. Probably wise to wait for a sale event if interested.

                  <a href="https:&#x2F;&#x2F;www.udemy.com&#x2F;course&#x2F;blender-3d-sculpting-course&#x2F;" rel="nofollow">https:&#x2F;&#x2F;www.udemy.com&#x2F;course&#x2F;blender-3d-sculpting-course&#x2F;

                  Best of luck =3

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