Creates a force that pushes away from the selected object. This lets you expand (blow up) a fluid system at a specific time in a specific shape, which is useful for explosions.
(Technically, the expansive force is a divergence field.)
See fluid sourcing for information on how the tool transforms the input object into a source for the effect.
Using Expand from Objects
|Create a fluid container|
|Fill a fluid container|
|Create an expansion force|
|Control the amount of expansion|
In the DOP network, find the Source Volume node importing the divergence field (named
Use the Scale source volume parameter to control the amount of expansion. You can keyframe this value to delay and/or limit the expansion time, pulse the expansion, etc.
Sometimes very high values may be necessary (100+) to have visible effects.
Most “populate containers” defaults are configured for a sphere with a radius of 1 unit. For much smaller or larger volumes, you may need to change settings on the Fluid Source surface node created by the shelf tool. The Sample Radius, Edge Location and Feather Length parameters give extensive control over how everything is sampled into a volume.