Auragen docs
Auragen docs

Getting Started

OverviewInterfaceNode GraphParameters and Controls

Operators

Surfaces
Particles

System

Particle System

Emitters

EmitterMesh EmitterImage Emitter

Effectors

Curl Noise EffectorTurbulence EffectorQuantized Motion EffectorGravity / Wind EffectorWind EffectorDrag EffectorAttractor EffectorPoints EffectorVortex EffectorTwist EffectorSpring EffectorMesh Attract EffectorImage Form EffectorField Flow EffectorFluid EffectorExplode EffectorShockwave EffectorSoft Collision EffectorPrimitive Collision EffectorKill Box EffectorColorize Effector

Renderers

Point RendererSprite RendererMesh RendererPoint Geometry RendererConnection RendererTrail Renderer

Other

Hologram
3D PreviewperformMODE
3D & SimulationParticles

Fluid Effector

A fluid solver whose velocity field carries the particles; wired video injects motion as force.

The Fluid Effector runs a 2D fluid simulation and moves particles with it. Wire a video and its motion stirs the fluid.

Fluid Effector

  • Sim Resolution, Vorticity (Swirl), Velocity Dampening, Solver Iterations
  • Video Force with optical-flow downsampling
  • Found in the node graph under Particles → Effectors
Example patch — drag onto the app to load

The image on the right is the example patch itself. Drag and drop it onto the app, or load it with File → Load, to open the full graph. A Plasma generator wired into the Video / Motion port.

Inputs and outputs

Fluid Effector node

PortTypePurpose
Effectors InEffectorThe previous effector in the chain, if any.
Video / MotionTextureA moving picture whose motion is injected as force.
Field ImageTextureA texture read by the Image field shape.
Origin ObjectSurfaceA Null to parent the effector to.
Effectors OutEffectorWire it into the next effector, or into the Particle System's Effectors port.

Parameters

Fluid Effector parameters
  • Velocity Scale (0–10, default 1), Apply Mode (Velocity (Stick) default or Force (Inertia)), Stickiness (0.5–60, default 18).
  • Plane Size (0.5–50, default 10), Flatten To Plane (0–20, default 1).
  • Sim Resolution — 64, 128 (default), 192, 256.
  • Vorticity (Swirl) (0–60, default 25), Velocity Dampening (0–4, default 0.25), Solver Iterations (4–50, default 20).
  • Video Force (0–10, default 2), Flow Downsample (1/8 recommended), Motion Smoothing (0–0.95, default 0.35).
  • Particle Use Amount (0–1, default 1) — the share of particles this effector acts on. Two effectors with the same amount act on different particles.
  • Speed Variance (0–4, default 0) and Speed Bias (−1 to 1, default 0) — scatter the force per particle.

Field

  • Field (default off) — limits the effector to a region. Field Shape (Sphere, Box, Plane, Image), Field Size (default 3), Falloff (default 0.5), Inner Radius, Invert Field, Field Follows Mouse, and Image Channel for the Image shape. The Field Position / Heading / Pitch / Roll / Scale block places it.

Every slider has a per-parameter animation bar, so it can be animated, audio driven, or MIDI mapped.

Examples

Dancer smoke — a Webcam into Video / Motion, Video Force 4.

Troubleshooting

Nothing moves. The effector's Effectors Out must reach the Particle System's Effectors port, directly or through the last effector in a chain.

Frame rate drops — lower Sim Resolution.

Related

FluidSIM

The 2D fluid generator.

Field Flow Effector

Reads a texture's red and green channels as an XY velocity field.

Explode Effector

A radial impulse fired in a short window after each particle spawns.

On this page

Inputs and outputsParametersFieldExamplesTroubleshootingRelated