#solid (predefined symbol)
|bool||Never||In transformations, and in the final section of coloring algorithms||No|
Transformations and coloring algorithms can set this predefined symbol to true to indicate that the pixel being calculated should have a solid color.
Before executing the transformations and coloring algorithm, Ultra Fractal sets #solid to false, so you won’t have to write to it if you don’t want a solid color for every pixel.
#solid = true