Execution sequence

To help you understand the way Ultra Fractal executes the various sections in all formula types, here is an overview of the execution sequence per pixel, written in pseudo-code similar to the formula language.

Before calculating the image, the global sections are executed:

for each transformation
  execute global section of transformation
execute global section of fractal formula
execute global section of inside coloring algorithm
execute global section of outside coloring algorithm

Then, for each pixel, the following calculations are performed:

for each transformation
  #solid = false
  execute transform section of transformation
  if #solid == true
    stop and give pixel the solid mapping color
endfor
execute init section of fractal formula
execute init section of inside coloring algorithm (if it exists)
execute init section of outside coloring algorithm (if it exists)
int iter = 0
repeat
  execute loop section of fractal formula
  bool b = the expression in the bailout section of the fractal formula
  if b == true
    ; not yet bailed out
    execute loop section of inside coloring algorithm (if it exists)
    execute loop section of outside coloring algorithm (if it exists)
  endif
  iter = iter + 1
until (b == false) || (iter == #maxiter)
#numiter = iter
if #numiter == #maxiter
  ; pixel is inside
  execute final section of the inside coloring algorithm
else
  ; pixel is outside
  execute final section of the outside coloring algorithm
endif
color the pixel

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