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 The The instructions on this page will guide you in adding a void object to make fluid content disappear in a fire/smoke simulation.

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Start with a simulation. This example will create a volume with a layer of smoke.

Use the Cold

Smoke Quick Simulation Setup

 with a flattened cube as the emitter object.

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the Grid

 rollout, adjust

the X/Y/Z Size

 of the

Simulator to make it more compact.

The emitter object will be used to create a dense layer of smoke at the beginning of the simulation, so we have it expand beyond the simulator volume for full coverage.

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 to Disabled. 

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the Fire Source

 node. Set the

 Emit Mode

 to Volume Brush. Disable

the Temperature (K)

 channel since we will only use Smoke.

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the Discharge

 value. On frame 4, set the value

to 95.0. Right-click the field to set a key. On frame 5, set the value

to 0.0

 and set a  key. This will allow the simulator to fill the volume with smoke for four frames, then stop producing smoke afterward.

the Dynamics

 rollout, set

the Smoke Dissipation

 to 0.0. This will prevent the smoke from disappearing by itself over time. 

you Start

 the simulation and set the viewport

to Wireframe

 mode, the volume will fill with smoke, then sit untouched.

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Simulator.

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second Fire Source

 node in the scene. To connect it to the cylinder, click

the Edit Object Set

 button to launch

the Relationship Editor. On the left, select phxSource_set2 and then select the cylinder on the right.

To make the cylinder act like a void object instead of an ordinary emitter, navigate to the Fluid Discharge section. Set

the Emit Mode

 to Volume Inject. Phoenix will prompt you to convert the emitter object, the cylinder, into

a Non-Solid.

Select Yes.

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Next, set

the Discharge

 to a negative value such

as -50.0. Disable

the Temperature (K)

 and Smoke channels. This will make the cylinder remove fluids from the

Simulator.

Simulator.

the Example Scenes

 page, uses a Maya Vortex Field in a cloud simulation. The Void Object (cylinder) is placed under the Vortex.

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