re: renderman dual scattering in softimage, appears someone has it working in 3delight
https://vimeo.com/19108621 also someone at mental ray did implement a dual scattering shader for 3.12 - see here for details under human hair, not sure if its included in 2015 or not look for basehair best Rob On 6 December 2014 at 20:53, Anto Matkovic <a...@matkovic.com> wrote: > Custom Rman shaders available around, they are only 'core' part. Even you > can apply them as 3dl property, you can't get proper point-based GI in most > cases, especially not path traced GI, MIS an so on.Custom color mapping, > coming from SI, won't work too, of course. > All of free Marschner Rman shaders are single scatter model ( single > scatter = Muh Hair). Implementation of fancy dual scattering model, this > seems to belong to additional coding in RMan and 3delight, not a plain RSL > - so, unless Pixar will have a mercy, don't believe you'll be able to get > the dual thing in upcoming Renderman, too. Maya or SI, doesn't matter. > > Perhaps the shortest path for one man band and single machine, it is to > just hack the RSL of 3dl emulation of SI hair shader, add code for shifted > highlight, map the parameter to something unused in PPG ( 'flat light' for > example), use two or three opaque shaders in render tree, pass the result > through constant shader for transparency and GI, at the end. 3delight is > quite good in optimizing the structure of this kind. But this is really a > hack. > > Regarding Mr, old Muh Hair definitively won't work, but there is a chance > to get working version of p_HairTK, somewhere. Or, maybe, working > implementation of built in 'basehair' in latest Mental Ray 3.12. Both are > single scatter model, but, still more than out of the box solution. > > ------------------------------ > *From:* Leendert A. Hartog <hirazib...@live.nl> > *To:* softimage@listproc.autodesk.com > *Sent:* Saturday, December 6, 2014 1:55 PM > *Subject:* Re: realistic hair shading SI-MR > > Any chance of achieving better results with 3delight (as it's so "budget > friendly"), possibly with custom shaders? > > > > > Greetz > Leendert > > -- > > Leendert A. Hartog AKA Hirazi Blue > Administrator NOT the owner of si-community.com > > > >
