Friction Quick Tip #4 - Use expression and current scene frame to create procedural animation

In friction, you can use the current frame number through expresions to create quickly and without any keyframe simple animations. - Create a square to animate its rotation - Open the expression editor by right clicking the rotation property - In the Binding section, create a named variable for the $frame scene attribute : current_frame=$frame - In the Calculate section, return this variable for friction to use it as Rotation value : return current_frame - The square is now rotationg without any keyframe - In the expression editor, speed up the rotation by multiplying the frame value with a number : return current_frame*100 - To control the rotation speed, use a custom property (dummy user-created properties), create a Speed property (activate layer's Custom Property through right-click menu, then add a single value property) - Use it in the expression editor by binding it to a variable : speed=properties.speed - Then use this variable as the multiplier in the Calculate section : retu