Non-Newtonian and Viscoelastic Fluids

1.Non Newtonian Fluids  viscosity does not depend on on the stress state and velocity of the flow. On the other hand the viscosity of non-Newtonian fluids is dependent on shear rate or shear rate history. In Shear thickening non-Newtonian fluid, apparent viscosity increases with increased stress. Such as, Application in Houdini,  In example below, increased pressure make fluid […]

Houdini Bullet Solver 1

1 Bullet Altering Attributes In fallowing example deforming and in-active bullet object is transformed non-deforming active object. It is done by transferring second objects attributes (box) to bullet object in sopsolver inside dop. 3)object merge, merges animated box with attributes of active=1 deforming=0 4)attribute transfer for point attributes of active and deforming   2 Bullet Constraint […]

Houdini Solvers Mutual Interaction

1A. Cloth – Pyro Interaction  On default, pyro interacts withj cloth(if pyro solver connected first to merge node). However in this method,  pyro  do not colide but just affect as field force(left example) . In order to have proper colision, cloth obj should be imported with sop solver as colision source. (right example) importing velocity and density from […]

Houdini Micro Solvers 2

In fallowing example gas analyses micro solver is used in order to calculate curl and curvature fields for more detailed fluid shape. importing points to sim. particles advected by velocity. normal curl and curvature fields are matched with reference “vel” field. gasParticletoField, particle normals transfered to field with “normal” name. gasAnalysis:  curl analyses has been […]

Houdini Micro Solvers 1

Micro Solvers are building blocks in Houdini simulation. Mostly they are doing one task in a clean way. SideFx’ fluid solvers from scratch tutorial and  Pater  Claes’ master theses about custom fields helps a lot for learning however there are tons of them and started to a bit confusing. Hence I make little list of these nodes with some examples attasched. It is […]

EvolutionBox 1.2.0

EvolutionBox 1.2.0 EvolutionBox is unity based simulation. I tried to take evolution as main mechanism for creating AI.  Here is first steps for creating agent interacting with environment, evolve accordingly. On next steps, I will work more on pattern recognition, and self learning.  Download Sim : Sim download is possible with the link below,  extract zip and […]

Feather Creator

I did little coding on wing rigging automation. Seems like all birds have same pattern except number of feathers in primary and secondary row, So rig is flexible on wide range of wing types. However I see some differences which system can not create for now, For instance; On chickens secondery Coverts becomes two layers of […]

mel script for correctiveBlendShapes

In facial rigging, corrective blend shapes can become very tedious and time consuming process.  Sometimes it take more effort to arrange and connect blend shapes than actually sculpting them. So wrote a script for standardizing and making process easier. Limitations :In current script target geometry should not have any  outputs. Still working by disconnecting  outputs before creating or editing shapes need. Also being able to create corrective for more than two target […]

secondaryAnim script

Lately i had a project about growing plants in VR environment. With help of any “L system based software”  it is fairly easy task however platform was unity and unity can’t import changing vertex numbers. All animation had to be done joint or blendShape based. So update one of my old script, secondaryAnim Script basically takes first […]