Fluid Effects > Add/Edit Contents > Gradients

Density/Velocity/Temperature/Fuel: Turn on the properties you want to be represented by gradients. You must select at least one property. When a property is turned off, the default method is applied (for Density and Velocity, Dynamic Grid, and for Temperature and Fuel, Off (zero).

Density/Velocity/Temperature/Fuel Gradient

Select which predefined set of values you want to place in the container:

Constant: Sets the value to 1 throughout the fluid.
X Gradient: Sets a ramp of values from 1 to 0 along the X axis.
Y Gradient: Sets a ramp of values from 1 to 0 along the Y axis.
Z Gradient: Sets a ramp of values from 1 to 0 along the Z axis.
-X Gradient: Sets a ramp of values from 0 to 1 along the X axis.
-Y Gradient: Sets a ramp of values from 0 to 1 along the Y axis.
-Z Gradient: Sets a ramp of values from 0 to 1 along the Z axis.
Center Gradient: Sets a ramp of values from 1 at the center, to 0 along the edges.