A constant value of 0.
Time in seconds since the particle was emitted.
Time in seconds since the action became active.
An action becoming active is for example the delay from NodeAttributes being over, or the active State changing, making a node change which of its configs is active.
Time in seconds between the effect being created and the particle being emitted. Stays constant per particle.
An external value.
In property modifiers, which external value is used is controlled by a field in the modifier.
Arguments used when evaluating properties.
There is no way to change what argument is given to a property. Each property has one specific argument given to it, and this is sometimes the only difference between two properties in the same action.