HY - Emission Stop

One common question is how to stop the emission of new particles? There are several methods to do this.

Defining a Volume

The relevant settings are located in the Hybrido emitter node under HY_Emitter node > Node Params > Emitter:

• When “Stream” is set to “No” RealFlow creates a certain number of particles based on the shape of the object under Node Params > Emitter > Object.
• Once the simulation starts no more particles will be created. 

Stream Animation

In simulations where “Stream” is set to “Yes” it is possible to animate the parameter:

• Let's say the emission of particles should stop at frame 50.
• Stream > Yes
• Shift the timeline slider to frame 49.
• Click on the dot next to the “Stream” parameter.
• Go to frame 50, set “Stream” to “No”, and click again on the dot.
• Right-click on “Stream” and choose “Open curve”. The “Curve Editor” is opened.
• Select the two keys and click on “Set Selected Points Type to Stepped” (see image below).

Stream Expression

A very simple, yet effective method is to manage emission with an → expression:

• Right-click on “Stream” and choose “Open curve”. The “Curve Editor” is opened.
• In the empty field to the left of "Delete Expression" enter: if(f>49,0,1)
• This expression says that if the current frame is greater than 49 the “Stream” option will be set from “Yes” to “No”.
• These two states are represented as binary numbers here: 1 and 0.