Jesse I am noticing problems with de in some cases, with some kinds of surfaces
Some are rendered perfectly normally but weird stuff appears on higher iters. Do not know how in the world I can "fix" this...
Yes, there is an error in the DE calculation, it would also show up with only 1 iteration if you increase the DEstop value!
(Btw, that is a good test to avoid such things in future.)
Example:
Mandelbulb3Dv17{
X.....S....O/.../....2....UlFSVTWp4J.XJRQFrp7x6E9NYvSWKN0.gnyD6i7732.7USpl3RL5.E
................................iy6Y/BLOcy1........A./..................y.2.....
................/M.0/....2Uk....8.....E2.....EqaJ/fFUTvD/..........m/dkpXm1....6
//....kD12../..........wz..................................u1....y1...sD...../..
.w1...sDXqIDScniryn5.NLVavKSzebXe20tp0sDGsGWItOHgxfwsP1ItSVezoGuLx44uDvDaVuQJGJl
1yvW.hEubvygzaGRCxT3FbuD......I0..............kD.2....sD..kz0...................
.............oAnAr1...sD....zU3Sx8.yspf.MaLj0UXSx8.qupf.shLj0U/Tx8....../....k1.
..................kz.wzzz1.U..6.P....M4...UE....W....k1....F....8/...I1.....SF52
...U.qFG9yzb2zzzRYoWzz7lz16.mc..zXCc..k18XGQeGyD/sIRhrVAkz1..........2.28.kFrA0.
.Ub96aAIVz9.1se7Umvxz0........../6U0.wzzz1................................E.0c..
zzzz.................................2U.8.kzzzD.................................
/6U0.wzzz1...................................2CcN/UvNP6.eeWCNq0.yRii.EJJUk1f..XR
S1.mx3CcN/UvNP6.QsLsUa3.ibhV..bTV1OK.sSq40.ly3CcN/UvNP6.MwLsUa3.ibhV.kqTV1OK.sSq
40.kz3CcN/UvNP6...EsUa3.eeWCNq0.IJ36wk8.wyLsUa3.................................
E....2....E.....I....U.....Hdp4QZFLG4B3.rJaQ..........................U1C....6..
..........kAnAnAnAnwz..........E........kz1..................U.E........kz1.....
...wzcNaNaNaNazj................................................................
........................}
So the DE works only on low distances, on higher it gets worse, this is because you got the errors on higher iterations, because the DEstop gets bigger, relative to the object.
What exactly must be changed in the formula, i can't say yet. Hope you find it.
Cheers!