first of all:

- mixing julia/mandelbulb is tricky, because of the different initialisations, it might work, but might produce different results

hehe, let me elaborate:

- do not confuse keyframes and interpolation, mandelbulb3d simply cant interpolate on a keyframe base between different fractals, what it does is just hard-switching to another fractal when it reaches the new keyframe

- to make it work proceed as follows:

1. Choose Hybrid Mode "Interpolate" the middle of the top 3 buttons in mb3d

2. the number of hybrid formulas then becomes limited to just 2

3. choose a second formula in the second formula tab

4. examine the formula window, in the lower part of the formula tabs you now find a "weight" value, this becomes normalised, sounds more complicated than it is, play with it, if one value is 0 you have the 100% of the other one if it is e.g. 1

so, as a starter take the below param setting, open up the 3dexplorer and play with the "weight" variable, which can be found in the parameter sliders when expanding the navigator window with the arrow in the lower right part

make a keyframe1 with formula1 "weight"=1 and formula2 "weight"=0

make a second keyframe2 with switched weights: formula1 "weight"=0 and formula2 "weight"=1

click on render preview and et voila

Mandelbulb3Dv18{

g.....S....O/...w....2...............1.......s1E................................

........................................kz1........Y./..................y.2...wD

...Uz6....k/..../M.0/......i....g.....E3.....omEQgisq6rD/..........m/dkpXm1....U

z.....kD12../..........wz.................................U0.....y1...sD...../..

.z1...sDYsAIxzzzjz1..........WAbUdisqcljRRxgCKosEwnYRydIKa5uzwPN9SaPRGyDFHQlSHA1

Iw1iNMIOip7tzqF/G0ZZtVyDU.....o0..............sD.6....sD..G.....................

.............oAnAt1...sD....zw1.........................................6....k1.

.....Ksulz1.......kz.wzzz1.U..6.P....U5...EB....m....c3....F....6/...I1.....SF52

...U.qFG9yzb2zzzRYoWzz7lz16.pc..zXCc..kvrEtMc7xD6ocyFE0ujz1..........2.28.kFrA0.

.Ub96aAIVz9.1se7Umvxz0........../EU0.wzzz1...........s/...................E.2c..

zzzz.............0...................2./8.kzzzD............8....................

/EU0.wzzz1...................................2CcN/UvNPcveeWCNq0.yRiibHJJUk1f..XR

SvBmx3CcN/UvNPcvQsLsUa3.ibhVi1bTV1OK.sSq4uCly3CcN/UvNPcvMwLsUa3.ibhVinqTV1OK.sSq

4uCkz3CcN/UvNPcv..EsUa3feeWCNqGQIJ36wk8EwyLsUa3f................................

E2...6..F3....sD.....6....EGiFLNbJaQU.pPrJaQ.........................c..........

...................6./........zj................................................

................................................................................

...........................3....8....oINiRKNmB1.h/5PZVLEiR4PZB5.................

.....MU/4MU/4................U.E........kz1........wz.........zD................

................................................................................

................................}

{Titel: Mandelbulb 3D v1.8.9}

in this issue of the chaostube news i am talkin a bit about what is happening ( from minute ~6 )