Glitch when rendering

Hello,

I was about to explore the Mandelbrot set when I ran into a glitch while rendering. It looks exactly like the kind of artifact I get when periodicity checking fails. I can usually just turn it of, but this was using perturbation (precise).

Here's an image:

The problem occurs only in one of the two layers (the one that uses Triangle Inequality Average)

Parameters:

glitch {
fractal:
  title="glitch" width=2560 height=1440 layers=2
  credits="Phillip;9/1/2020" antialiasing=yes
layer:
  caption="Background" opacity=100 mergemode=screen method=multipass
mapping:
  center=-0.1547051439710389900988284472626318241380905/-1.03103580509\
  1622376760863844837077965753295 magn=4.5392006E33
formula:
  maxiter=25000 filename="Standard.ufm" entry="Mandelbrot" p_start=0/0
  p_power=2.00/0 p_bailout=1e25
inside:
  transfer=none
outside:
  density=50 transfer=linear filename="Standard.ucl" entry="Triangle"
  p_power=2.0 p_bailout=1E25
gradient:
  smooth=yes rotation=-80 index=54 color=15200767 index=114
  color=2543853 index=200 color=2368658 index=262 color=512 index=-23
  color=4988990
opacity:
  smooth=no index=0 opacity=255
layer:
  caption="Layer 1" opacity=100 method=multipass
mapping:
  center=-0.1547051439710389900988284472626318241380905/-1.03103580509\
  1622376760863844837077965753295 magn=4.5392006E33
formula:
  maxiter=25000 filename="Standard.ufm" entry="Mandelbrot" p_start=0/0
  p_power=2.00/0 p_bailout=1e15
inside:
  transfer=none
outside:
  density=0.1 transfer=linear filename="Standard.ucl" entry="Smooth"
  p_power=2/0 p_bailout=1e15
gradient:
  smooth=yes rotation=-99 index=15 color=4858418 index=-270 color=512
  index=-208 color=2368658 index=-122 color=2543853 index=-62
  color=15200767
opacity:
  smooth=no index=0 opacity=255
}

Hi Phillip,

The Triangle Inequality Average coloring unfortunately isn't compatible with perturbation calculations.

OK, that explains it. Can I turn perturbation off and render it normally instead?

Unfortunately there is no way to do this at the moment -- I still need to implement that for these type of coloring algorithms. What you could do is make a copy of the Mandelbrot formula in Standard.ufm, and remove the perturbinit and perturbloop sections from this copy.