Bug or feature request, but it took me a while to figure out...

[Madman]

I think it's a bug, but it will probably be designated a missing feature by others, so hence the title 

If you render a parameter set with the volumetric light option, then switch of that light (which sometimes creates a much nicer volumetric light effect) and then save the m3i (or m3p) file, you will not be able to reproduce the results if you open the m3i file and rerender. In fact the results are totally unpredictable. Try rendering the below parameter set:


Mandelbulb3Dv18{
g.....S....O/...w....2...............1.......s1E................................
........................................kz1........Y./..................y.2...wD
...Uz6....k/..../M.0/...........O.....E3.....omEQgisq6rD/..........m/dkpXm1....U
z.....kD12../..........wz.................................U0.....y1...sD...../..
.z1...sDYsAIxzzzjz1..........WAbUdisqcljRRxgCKosEwnYRydIKa5uzwPN9SaPRGyDFHQlSHA1
Iw1iNMIOip7tzqF/G0ZZtVyDU.....YZ..............sD.6....sD.6G.....................
.............oAnAt1...sD....zw1.........................................3....k1.
.....Ksulz1.......kz.wzzz1.U..6.P....U5...kL....m....c3....F....6/...I1.....SF52
...U.qFG9yzb2zzzRYoWzz7lz16.pc..zXCc..kvrEtMc7xD6ocyFE0ujz1..........I.28.kFrA0.
.IXX.UYzyy9.6WWPM.psz.kNnmBoLVxj/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................................
E6...AE.W6E..........6....EGiFLNbJaQU.pPrJaQ.........................c..........
...................6./........zj................................................
................................................................................
.....................2.....3....0....wJEh3aSdtqN0x4S............................
.Q.............................E........Uz1.....................................
................................................................................
................................/....E/...U0....X3KSgJKSHJbQaZYFH/..............
............Cs....U.4MU/................sz1........../..........................
.....cNaNaNaNazD........kz1.......cJ.1.......O3k.......UK/A.....................
............................................}
{Titel: Mandelbulb 3D    v1.8.9}

If you see the same as I do, you'll see something resembling the start screen of M3D. If you open the 3DNavi, you'll see a more accurate approximation of the set. If you switch on the second light, rerender, and then switch of the light you will see the intended result.

[Jesse]

Indeed, if the light is not on, the volumetric light will not be calculated.
I designed it this way, so i would not call it a bug 

[Madman]

Uhh Yup.... That sounds reasonable  And I would understand it if that was the only thing that happened. Fact is however that more steps are bypassed. Indulge me and try to render the parameter set I added. Then check the 3D navi to see what should have been rendered...

[Jesse]

Uhh, i see... it just stops - without a message or something.

Kind of suboptimal