Here's a list of the events currently available in Spline:
Mouse Down - A transition happens when a mouse button is pressed.
Mouse Up - A transition happens when a mouse button is released.
Mouse Hover - A transition happens when the cursor hovers an object.
Scroll wheel - Transitions follows steps of mouse scroll wheel.
Key Down - A transition happens when a keyboard key is pressed.
Key Up - A transition happens when a keyboard key is released.
Start - A transition happens as soon as the scene is loaded.
Look At - An object with this event always faces the cursor.
Follow - An object with this event follows the cursor.
Play Sound - An object with this event plays a sound.
Game Controls - An object with this event can be used to navigate around your scene, with key inputs, gravity, and collision detection.