fluidEmitter

Basic Emitter Attributes

Emitter Type

Select one of the following emitter types:

Omni: Sets the emitter type to an omnidirectional point emitter. Fluid properties emit in all directions.
Surface: Emits fluid properties from randomly distributed positions on or near a NURBS or polygonal surface. When you emit from an object, the emitter is a surface emitter. For information, see Display fluid container contents.
Curve: Emits fluid properties from randomly distributed positions on or near a curve.
Volume: Emits fluid properties from a closed volume. You pick the shape from the Volume Shape option.

NoteIf you select Volume, make sure the emitter is bigger than one voxel.

Cycle Emission: Cycling emission restarts the random number stream after an interval in frames, specified by the Cycle Interval attribute.

Setting “Cycle Emission” to Frame and Cycle Interval to 1 causes the random stream to restart every frame. Cycle Interval values greater than 1 can be used to generate cycles for games work.

This only resets the random stream used by the emitter. It does not reset the random number stream used by MEL, shaders, and so on. Note also that the Frame option resets at most once per frame. However, oversampling does not affect the results.
Cycle Interval: Specifies the number of frames between restarts of the random number stream. See Cycle Emission. Has no effect if Cycle Emission is set to None.
Max Distance: Maximum distance at which new property values are created from emitter. Not used for volume emitters.
Min Distance: Minimum distance at which new property values are created from emitter. Not used for volume emitters.

Fluid Attributes

Density/Voxel/Sec: Sets the average rate at which Density values are emitted into the grid voxels per second. Negative values remove Density from the grid.
Heat/Voxel/Sec: Sets the average rate at which Temperature values are emitted into the grid voxels per second. Negative values remove heat from the grid.
Fluid/Voxel/Sec: Sets the average rate at which Fuel values are emitted into the grid voxels per second. Negative values remove Fuel from the grid.
Fluid Dropoff: Sets the dropoff value for fluid emission. For Volume emitters the dropoff specifies how much the emission drops off as you move away from the volume axis (dependent on the volume shape). For Omni, Surface, and Curve emitters the drop off is based on the emission point and radiates out from Min Distance to Max Distance.
Emit Fluid Color: Turn this option on to emit color into the fluid color grid. The grid must be dynamic.
Fluid Color: Click the color swatch and select the emitted fluid color from the Color Chooser. This color is used only when Emit Fluid Color is turned on.
Jitter: Turn this option on to provide better anti-aliasing around the edgesof emitting volumes. Some effects, such as oceans and pond wakes appear better with this option turned off.

Fluid Emission Turbulence

Turbulence Type

Select the type of turbulence to apply to fluid emission.

Turbulence: The intensity of a force simulating a turbulent wind that evolves over time.
Turbulence Speed: The rate of change of the turbulence over time. The turbulence loops seamlessly every 1.0/Turbulence Speed seconds. To animate this rate attach a new time node to the time input and animate the time value on the time node.
Turbulence Freq: Controls how many repeats of the turbulence function fit inside the bounding volume of the emitter. Low values create a very smooth turbulence.
Turbulence Offset: Use this option to translate the turbulence within the volume. Animating it can simulate blowing turbulent wind.
Detail Turbulence: The relative intensity of a second higher frequency turbulence. This can be used to create fine features in large scale flows. Both the speed and the frequency on this second turbulence are higher than the primary turbulence. When the Detail Turbulence is non-zero the simulation may run a bit slower, due to the computation of a second turbulence.

Volume Emitter Attributes

Volume Shape: Indicates the shape of volume the emitter will use if the emitter is of volume type. Has an effect only if emitter type is Volume. Otherwise volume controls are disabled.
Volume Offset X, Y, Z: This is the parent attribute for the translational offset of the emission volume's center from the emitter's origin.
Volume Sweep: The arc of the volume emission. Used for sphere, cone, cylinder and torus.
Section Radius: Applies to torus volumes only. Defines the radius of a section of the torus.

Object Display

For details, see the Basics guide.

Extra Attributes

For details, see the Basics guide