+ HOUDINI PYRO NOTES

Houdini pyro notes

SOP

fluid source:

  • scalar volumes:

    • settings:

      • division size: 0.025
    • noise:

      • cell influence: 1

      • pulse duration: 0.2

      • turbulence settings:

        • sharpness: 1

        • amplitude: 2

        • turbulence: 4

        • element sixe: 0.5


DOP

source volume

  • scale source volume: animated
    (frame:value) -> 1:1, 3:2, 7:0
  • scale temperature: animated
    (frame:value) -> 1:1, 36:0.2, 72:0

gas resize fluid

  • delay frames: 1

  • bounds:

    • padding: 1

pyro solver

  • simulation:

    • temperature diffusion: 0.2

    • cooling rate: 0.5

    • bouancy lift: 2

  • combustion:

    • fuel inefficiency: 0.5

    • gas released: 25

    • flames:

      • flame height: 6
    • smoke:

      • create dense smoke: 1

      • smoke amount: 2


gas shred


gas disturbance (3 of varying block sizes)

  • disturb settings

    • block size: 0.3 / 0.1 / 0.03
  • control settings

    • use control filed: vel
      (since we use a vector value velocity we need to adjust the gas disturbance HDA to allow for this. We allow editing of contents of the node and dive in. Continue to dive in in the “disturb_vectorfield”. Find the “control_field” parameter. Since we want to use a vector as a control field we want to change the type from flot to vector. Since we want to use the magnitude of the velocity i.e. the speed, we insert a length vop between the “control_field” parameter and the if-then block vop)
    • control influence: 1.0
  • bindings

    • disturb field is vector field: 1

    • disturb field: vel


gas turbulence

  • time scale: 0.5
    a value less than 1 causes the sim to appear to be run in slow motion (seem larger)
  • turbulence settings:

    • scale: animated
      (frame:value) -> 1:1, 15:0.75, 30:0.0
    • swirl size: 2

    • pulse length: 0.9
      (how fast the noise moves)
    • turbulence: 3
  • bindings:

    • density field: temperature
      since there will not be much density in the beginning we use temperature

gas dissipate

  • diffusion: 0.1

  • evaporation rate: 0.01


drag force

  • scale force: 0.1

smoke object

  • multi field:

    • smoke

      • density filed: density

      • diffuse filed: density

    • emission

      • emmision scale: 1

      • emmision field: heat

      • emmision color field: temperature

      • emmision color range: 0 -> n
        use a number that gives a nice color distribution