Posted by: Jeff | 2017/02/06

Houdini: FLIP History


Here’s an unofficial list of updates and changes made throughout the development of the FLIP Solver and FLIP Object DOPs in Houdini from H11 to H16.5.

FLIP Fluids

Houdini 16.5
  • Volume Motion
    • NEW: Air
      • NEW: Enforce Air Incompressibility
      • NEW: Apply Moving Collisions
      • NEW: Min Air Region Voxels
      • H16_5_air.png
  • NEW: Narrow Band
    • NEW: Enable Particle Narrow Band
    • NEW: Bandwidth
    • H16_5_narrowband

Houdini 16.0
  • Volume Motion
    • Volume Limits
      • NEW: Fill New Volume
      • NEW: Use Waterline
      • NEW: Use Boundary Layer
      • H16_volumelimits
    • Collisions
      • NEW: Stick On Collision Group Box (Folder: Simple)
      • H16_stickoncollisionbox
    • Viscosity
      • NEW: Slip on Collision
      • NEW: Slip Scale
      • NEW: Use Control Field
      • NEW: Control Field
      • H16_sliponcollision
    • Surface Tension
      • NEW: Enable Surface Tension Blur
      • NEW: Blur Radius
      • NEW: Blur Filter
      • NEW: Blur Mask Field
      • H16_surfacetension
    • Solver
      • NEW: Collision Field for Solver
        • NEW: Collision Surface
        • NEW: Collision Weights
        • NEW: Collision Velocity
      • NEW: Guiding Fields
        • NEW: Source Surface
        • NEW: Sink Surface
      • H16_solverfields

Houdini 15.5
  • Volume Motion
    • NEW: Surface Tension
      • NEW: Enable Surface Tension
      • NEW: Surface Tension
      • H15_5_surfacetension

Houdini 15.0
  • Particle Motion
    • NEW: Vorticity and Rest tabs
  • Volume Motion
    • NEW: Velocity Transfer (Splashy & Swirly Kernels)
  • Solver
    • NEW: Distributed Pressure
  • Initial Data
    • NEW: Add Temperature Attribute
  • CHANGE: “Closed Boudaries” moved from Initial Data tab to Properties Tab.

Houdini 14.0
  • Substeps
    • NEW: Quantize to Max Substeps
  • Particle Motion
    • NEW: Interpolate Attributes
  • Volume Motion
    • CHANGE: “Smoothing” to “Velocity Smoothing”
    • CHANGE: Velocity Smoothing default from 0.3 to 0.1
    • NEW: Smooth Surface
    • Collisions
      • CHANGE: Velocity type from “Rigid” to “Point”
      • Point is good for animated geos
    • Viscosity
      • NEW: Float Precision Dropdown Menu
    • Solver
      • NEW: Use OpenCL
  • Physical
    • NEW: Temperature
* Houdini UI with check boxes are mis-aligned.

Houdini 13.0
  • Particle Motion
    • X: Ignore Particle Mass for Forces
    • Under-Resolved Dropdown:
      • NEW: Use Extrapolated Velocity [default](Former default was “Treat as Ballistic”)
    • NEW: Behavior
      • NEW: Age Particles
      • NEW: Reap Particles
      • NEW: Delete Attributes
    • Reseeding
      • NEW: Random Seed
    • Solver
      • NEW: Automatic Extrapolation By Speed

Houdini 12.5
  • FlipSolver::2.0
  • Particle Motion
    • NEW: Droplets tab
  • Volume Motions
    • Collision
      • NEW: Normal Scale
      • NEW: Tangent Scale
      • NEW: Control Field
    • Solver
      • NEW: Extrapolation Mode(with compatibility option)

Houdini 12.0
  • Substeps
    • Particle Advection CFL
  • Particle Motion
    • NEW: Ignore Particle Mass for Forces
    • CHANGE: Moved Force Override from Volume Motion Tab
    • NEW: Under-Resolved Particles
    • NEW: Collision Detection
    • X: Detect Particle Collisions
    • X: Integrate Particles
    • NEW: Reseeding tab
    • NEW: Separation tab
    • CHANGE: Moved Particles Separation controls to a new tab
  • Volume Motion
    • A bunch of old and new parameters
    • Rearranged and organized the parameters
    • Volume Limits tab is unchanged
    • CHANGE: The Pre-conditioner was formerly a dropdown menu
    • Old tabs:
      • Surface
      • Divergence
      • Projection
      • Volume Limits
  • NEW: Flip Object DOP
  • Internally uses a Particle Fluid Object DOP
Houdini 11.0
  • NEW: Flip Solver DOP
  • No Flip Object DOP yet
  • A Flip Configure Object DOP was used to setup a Flip Object

Houdini 17.0 (Placeholder)

Particle Fluids (SPH)

In relation to the FLIP Fluids, the former type of liquid simulation used in Houdini was referred to as Particle Fluids, or most commonly know as Smooth Particle Hydrodynamics simulation (SPH).

Houdini 11.0
  • Advanced
    • NEW: Create Substep Data
Houdini 9.0
  • NEW: Particle Fluid Solver DOP

* Particle Fluids are basically untouched since version 11. Focus has shifted to FLIP since then.

For an unofficial history of SideFX Houdini, I also did a list at the odforce forums here.


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