3D Modifier - Colorize all vertex of the geometry using a Gradient and a 3D Mask
3D masks enable selecting 3D vertices based on their different attributes such as position, color and texture coordinate.
Allow you to colorize vertices using a color Gradient. The Mask parameter defines the input
attribute that will be taken to lookup in the color gradient (Random by default).
3D Mask: The input attribute to use to select the color inside Gradient