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Excellent images. Mostly Mandelbox, am I right? #2 looks like scale = 3, but I can't say I recognize #1.

all mandelbox, and mostly negative powers. i reeeeeeeeeeeeeeeeeally wish i could remember the params for no.2, but you know the way it is... render; tweak; render; tweak unto infinity.

save your params, kids

here's a nice zoom seq:

thanks, tglad - and thanks for all the amazing work you've done with the mandelbox formula, too.

i'm using mandelbulb3d at present - i could switch to ultrafractal, possibly in time.
with mandelbulb3d, careful manipulation of the z-slice parameters should help me avoid this, correct? i quite like the effect in the second picture though, gives it more of that m.c. escher feel 

Greetings, and Welcome to this particular Forum !!!    

Nice images !!


Really no need to switch, unless you just wish to use it as shareware.  There are so many FREE applications that are available, and some that are much cheaper but will do things that UF can not, such as create real 3-D objects for exporting to other rendering programs.