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

Next: 

Invalid operations

See Also

Writing transformations

Writing fractal formulas

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