beamPreconvertedFields
The extraFields a beam definition must declare.
beamPreconvertedFields: { }
Import gradients from shaders/std and use gradients.beamPreconvertedFields.
Spread it as extraFields: beamPreconvertedFields next to the beam paint.
Example
extraFields: beamPreconvertedFields,
See also
beam— A glowing beam of light between two points.