1-We always start with the character design made here at SHED as a reference.
For the whole hair process we use a collection of in-house compounds that are derived from krinstinka ( http://www.matkovic.com/anto/kristinka-hair.html ) and Melena (http://opensource.nestanimation.com/melena.html ). We also recently added a few nodes fromTriggerfish animation studios ( http://www.triggerfishstudios.com/en/ ).
2 - We then look up on the internet for a real life reference
of what the hairdo could look like. This
is only as a reference to capture certain real life details. Since we are going for a Cartoonish look, we
are not aiming at reproducing the reference exactly. Of course a picture of a duckface girl is
always a plus.
3 - We proceed to create an emitter fitted to the head from
which we emit guide strands with Ice.
They get their shape from nurbs surfaces. Those guides are low in number (from 200 to
400), so it's easy to work with them to groom and later simulate and cache on disk. The idea is to get the shape of the hairstyle
and the length. The bright colors are
there to help see what's going on.
4 - Next, we clone theses strands, add an offset to their
position and apply a few Ice nodes to further the styling. These nodes generally include randomizing and
clumping amongst others. We now have
around 90 000 strands and it can go up to 200 000.
5 - Then we repeat the process with the eyelashes and the
eyebrows. During the whole process the
look is tweaked in a fast rendering
scene.
6 - Once happy with
the results, we copy the point clouds and emitters to the "render
model" where the point clouds will be awaiting an Icecache for the corresponding shot. We use Alembic to transfer
animation from rig to render model and the Ice emitters are "cage
deformed" to the alembic geometries because the hair styling is done too
late in the process to include theses emitter in the alembic export.
7 - Back to the Hair model we convert the guides
strands to mesh geometries. We apply
syflex cloth simulation operators to these geometries to get ready for shot simulation. We link the guide strands to the syflex mesh
so they inherit the simulation.
8 - Next comes shot by shot simulation and Ice caching of
the guides strands (hair, lashes, eyebrows and beard if necessary).
10 - Once we are happy with the look of the hair, the movement of the simulation AND most of all once we've resolved all the problems, we give the signal to the rendering department. The hair PointClouds are always automatically linked to the appropriate simulation cache for the current shot so all they have to do is "unhide" the corresponding object in their scene and voila !
Luc Girard, our hair artist, was interviewed by the guys at TD Survival on facebook. You can watch the video here:
Cheers guys. Thats pure gold right there!
ReplyDeleteFemi
Kudos for these tips and especially for keeping a promise and delivering as Femi Adegboye said "pure gold"!
ReplyDeleteIf I may, I want to ask, how do you "...link the guide strands to the syflex mesh so they inherit the simulation."
Do you use ICE for this or do you just use syflex mesh as deformer for strands?
Also "...Ice emitters are "cage deformed" to the alembic geometries", do you mean you just simulate using baked animated mesh data or?..
And lastly, you say "With final beauty renderings taking sometimes close to 2 hours per frame". Is it on a 12-core Xeon machine and in 2538x1080 resolution? Do you use a render farm for rendering with Arnie or do you have your own in-house render farm? If you do, how many machines would you recommend for rendering a short like this one in a reasonable time?
Cheers and thanks again!
Thanks for the mention of the "Triggerfish nodes". :D Love it! Keep up the amazing work guys
ReplyDeleteThanks a lot for all the good words.
ReplyDeleteHere are the answers to your questions Serpin :
- We link the Guide Strands back to the Syflex mesh through a set of nodes in Ice.
- The animation of the mesh we use to simulate is sent to us with Alembic. We do not have the rig in the simulation scene.
-We have our own render farm with 25 nodes for rendering (20 X 24 cores machines + 5 x i7).
Luke, you're awesome. Thank you!
ReplyDelete...I cant imagine how Arnie renders on a 24 (!) core machine... It must be beeeautiful...
Good luck!
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ReplyDeleteFirst of all, great job. Your hair system is the resultsthe most beautiful that I've ever seen on such cartoon renderings. Both simulation and rendering.
Currently a senior at the ESMA (France), we make a short film where the hair is crucial. Indeed, this film takes place in a hair salon!
We are at the end of pre-production and begin to take into consideration issues rendering and simulation.
We are working on Autodesk Maya, and I wanted to know if Luc Girard, your hair artist, had already worked on this software. In fact, we'd love to enjoy the lights, advice and return of this talented artist if possible.
A big thank you for your many explanations on this blog, which are a huge resource for students like us !
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Just a silly question. Is it possible to create that kind of short hair with Kristinka, or I need to use additional nodes? That's a similar hairstyle that I would like to recreate
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