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 Author Topic: Mandelbulb3d v1.7.8  (Read 8710 times) Description: 0 Members and 1 Guest are viewing this topic.
DarkBeam
Global Moderator
Fractal Senior

Posts: 2512

Fragments of the fractal -like the tip of it

 « Reply #15 on: February 18, 2012, 05:30:01 PM »

The problem is easily solvable! Like I did for other troubleful surfaces, I simply cut off

1. I calculate the de
2. I calcuate R - 3*R1
3. I calcuate abs(z) - 3*R1

DE = Min(de1,de2,de3)

(That's a cylindrical scissor baby )

Now it's 3x faster and more stable
 limpet.JPG (18.21 KB, 436x340 - viewed 577 times.) « Last Edit: February 18, 2012, 05:41:53 PM by DarkBeam » Logged

No sweat, guardian of wisdom!
Jesse
Fractal Schemer

Posts: 1013

 « Reply #16 on: February 18, 2012, 09:53:42 PM »

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JiemeK
Forums Newbie

Posts: 2

 « Reply #17 on: February 20, 2012, 06:22:10 PM »

Hello
Concerns Mandelbulb general and also V1.7.8
First sorry for my poor english …and my low knowledge level in fractal’s matter.
I have some problems of understanding differents points of the Jesse’s  « Read me » and I do not know where I may show these problems on the Fractal Forums, so I try here.

1 – Formulas
I do not understand what is exactly done :
1°) under the option « Alternate »(used in turns ?) what exactly happens ? I understand the sequence of formulas but no the aggregation of each partial result.
2°) under the option « Interpolate », which variable is interpolate ? DE ? and how ?
3°) under the option « DE Combinate », for me, there is no making head or tail for it.
Replaced the average DE combinate method with an inverting and max comb.
What is precisely a combination ? How works a « inverting and max comb » ?
Options for inside rendering (beta) and "min" DEcombinate with overlap
S1 = minimum function with a linear overlap function ?
S2 = like S1, nonlinear function, more smooth overlap ?
4°) dIFs
Before V1.7.7 , mixing of dIFs with other formulas doesn’t work (OK) but after
« Added DEcombinate methods to mix escapetime formulas with dIFS »
how can I know which formulas are « escapetime » in the lot of proposed formulas ?
2 - Lighting /Background Picture »
« Fit left+right borders, with . . . » : Independently of the relative sizes of the main image and the background picture, I have no effect . . .  or I don’t understand the wording.
3 – Save Image/png.par
« Save text parameters in PNG.file, if selected »
Where is the resulting file ?

Jesse : Congratulations for such a detailed and useful job but why don’t you use a  no black color for the new text in you « Read me » ?

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DarkBeam
Global Moderator
Fractal Senior

Posts: 2512

Fragments of the fractal -like the tip of it

 « Reply #18 on: February 20, 2012, 06:28:51 PM »

The best answer is; try and try... It's too long explain all in detail for Jesse
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No sweat, guardian of wisdom!
Sockratease
Global Moderator
Fractal Senior

Posts: 3181

 « Reply #19 on: February 20, 2012, 06:51:53 PM »

I agree with Darkbeam for the most part.  It is often more an intuition for many settings more than any set procedure

But I can help with One of your questions!

2°) under the option « Interpolate », which variable is interpolate ? DE ? and how ?

Try varying the Weight Parameter.

Here's a thread discussing it, with an example m3a file to show how to animate the weights and morph one formula into another  (along with many interesting shapes in-between).

http://www.fractalforums.com/mandelbulb-3d/the-interpolations-in-mandelbulb3d/

And may as well post the gif just because...

Other advice:  When you see an interesting image posted in the Gallery or Forum or elsewhere, and it has the parameters posted, copy them and open them in M3D - then look at how it was done, change stuff to see what happens, and learn from others.

Hope that helps..
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Life is complex - It has real and imaginary components.

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mkbrouse
Explorer

Posts: 44

 « Reply #20 on: February 25, 2012, 07:48:52 PM »

Wow - a new version? Sweet!

Looks like I have to figure out how to upgrade, thanks a bunch Jesse!
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Thanks!
Michelle
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