(Solved) Movement of pixels in several keyframes normal?

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Offline Micha1982

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« on: April 02, 2018, 11:42:31 PM »
Hi again...unfortunately I have many problems and questions regarding Mandelbulber (2.13)...

First of all is the movement in pictures even if I change nothing:

I open any example, just change the resolution to 720x480, open the animationdock, enter 2-3 exact same keyframes with 5 frames/keyframe, and the resulting images all have some kind of "crisp movement" in it.

Why? Never recognized this in earlier versions, but I am not completely sure, is that normal/related to fractal-calculation at all? Can't exactly explain this movements, the pictures all have slightly movements of several pixels in some areas...I am not sure but has the "Anim by Sound"-function maybe something to do with this behaviour?

Shouldn´t the result be exactly the same pictures if I change nothing? Is this normal?

Good visible in "Hybrid 1.fract" for example. Or in "Benesi 001.fract".

Linkback: https://fractalforums.org/mandelbulber/14/movement-of-pixels-in-several-keyframes-normal/1152/
« Last Edit: April 24, 2018, 11:13:17 PM by Micha1982 »

Offline mclarekin

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« Reply #1 on: April 03, 2018, 07:20:22 AM »
I am guessing thtat it is to do with interpolation

In keyframe table, right  click on a parameter name. If not already selected , choose "linear" and see what happens.. This could explain movement, but the keyframes themselves should still render exactly the same. H'mmm??

 I have been meaning to test this sort of thing out, so all feedback is good..

Offline buddhi

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« Reply #2 on: April 03, 2018, 05:02:42 PM »
This is a problem not with camera or object movement but random noise which is coming from inaccurate calculation of fractal.
When distance estimation algorithm (which is used in ray-marching algorithm) is not accurate for some fractals, there is visible random noise on image.
This is the reason why every frame is slight different for these fractals.
To reduce this effect you can reduce "raymarching step multiplier" parameter (in Rendering engine dock), but it will increase rendering speed.

To learn more about distance estimation and ray-marching, you can read "Distance estimation" chapter in User Manual (available from help menu)

Offline Micha1982

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« Reply #3 on: April 04, 2018, 02:06:28 AM »
Many thanks for the answers, I'll try and watch it.

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