Use this option to animate one property in response to changes in one of each particle’s other properties. For example, the following code animates particles’ size as a function of their velocity, causing particles to become larger when they move faster:
To refine the relationship between a range of property values and a range of input values for the controller’s animation, use the inputBias and inputScale properties.
If you specify a vector property (such as acceleration) as the input property, SceneKit uses that vector’s length for the input value.
A node whose distance to each particle provides input values for the controller’s animation.
This documentation contains preliminary information about an API or technology in development. This information is subject to change, and software implemented according to this documentation should be tested with final operating system software.