Szymon Kapeniak


About Me

CG Supervisor


Recent Forum Posts

ROP nodes dependency graph Feb. 14, 2019, 11:32 a.m.

render -p gives a sorted list of nodes + dependency and frame list.
/ -> render -p -c out/comp_shot/
1 [ ] sim_hair  1
2 [ 1 ] bake_textures   1
3 [ 2 ] render_body     ( 1 10 1 )
4 [ 2 ] render_hair     ( 1 10 1 )
5 [ 3 4 ] comp_shot     ( 1 10 1 )

Mantra Light Shaders Nov. 14, 2018, 4:15 a.m.

Checkout ASAD Light/Shadow SHOPS as they are comprehensive source of information on how to write custom light shaders.

Ziva muscles vs Houdini muscles Oct. 9, 2018, 2:56 p.m.

Ziva FEM solver is specifically designed for muscle simulation which enables many optimizations. Main challange for the solver in case of muscles is interpenetration and collision between muscles, and in fact this is the slowest part of Houdini FEM. We run sims with 50+ muscles in minutes without piecewise collisions. I can't really complain. Typical scenario is using SDF approximation of muscles for fast collisions with a very little lost of accuracy in terms of volume preservation. Houdini, being general FEM solver, doesn't do that (it's a pity FEM solver does't allow micro solvers for custom collision handling, but this might be technically tricky as I presume since collision response has to be efficiently injected into finite elements matrix).

Personally I don't see big advantage of Ziva over Houdini muscles. And as always, Houdini flexibility will be huge win for any advanced system. Do any complicated character with skin, mixed muscles with linear skinning, post process corrections and blend shapes, and you will see the difference.

And yes, Vellum (XPBD) is a new chapter for muscles in Houdini.