Hi!

I am trying to understand the concepts behind Mandelbulber formulas, the effect of the myriad of parameters and, especially the interactions between formulas when we use the "hybrid" tab. Since I'm coming up with maybe two or three questions every day, and there doesn't seem to be manuals and tutorials that answer them, I decided to start this topic, where I (and, hopefully others) can ask specific questions on the behaviors, formulas and parameters in Mandelbulber.

My first question is about—for my lack of a better name for it—noise in fractals. Take the two images below. Both of them were made using the same formulas (#1: Menger-Mod1, and #2: AboxMod1) with the same hybrid settings: repeating from fractal #1 and Spherical folding. on the blue-pink image I just set the z.x multiplier to 3, leaving all other parameters in their default positions. In the yellow-blue image I also changed the foldM x parameter to 0.3. On both images there is noise, little fuzzy black-dotted regions, which are much more pronounced in the yellow-blue image.

photo sharing sitesSo, Why do I get this black noise on both images? Why is it more pronounced on the second one? How do I get rid of it on my images?

Here are the .fract settings for both of them:

Blue-Pink:

# Mandelbulber settings file

# version 2.10

# only modified parameters

[main_parameters]

ambient_occlusion 1,5;

ambient_occlusion_enabled true;

camera 0,7482060271178772 3,901021234470435 0,7643944131192546;

camera_distance_to_target 4,045006520342419;

camera_rotation 169,1426662893869 -10,89281816373087 0;

camera_top -0,03559561879585153 -0,185589610005714 0,9819824074699443;

delta_DE_function 2;

flight_last_to_render 0;

formula_1 61;

formula_2 64;

hybrid_fractal_enable true;

image_height 1080;

image_width 1920;

keyframe_last_to_render 0;

mat1_is_defined true;

mat1_surface_color_palette fd6029 698403 fff59c f5bd22 0b5e87 9c6b5f 941a5b 2d52c6 d4ffd4 aba53c;

raytraced_reflections true;

spherical_folding true;

[fractal_1]

IFS_rotation_enabled true;

mandelbox_scale -1,9;

transf_constant_multiplier_111 3 1 1;

[fractal_2]

IFS_abs_x true;

IFS_abs_y true;

IFS_abs_z true;

IFS_direction_0 2,618 1 -1,618;

IFS_direction_1 -1,618 2,618 1;

IFS_direction_2 1 -1,618 2,618;

IFS_enabled_0 true;

IFS_enabled_1 true;

IFS_enabled_2 true;

IFS_offset 1 1 1;

IFS_rotation_enabled true;

IFS_scale 2,618034;

[fractal_3]

IFS_rotation_enabled true;

[fractal_4]

IFS_rotation_enabled true;

__________________________________________

Yellow-Blue:

# Mandelbulber settings file

# version 2.10

# only modified parameters

[main_parameters]

ambient_occlusion 1,5;

ambient_occlusion_enabled true;

camera 0,7772536648650633 3,894811623192553 0,778154809512912;

camera_distance_to_target 4,047123144564551;

camera_rotation 168,7142385497866 -11,08549688499985 0;

camera_top -0,03762840768556099 -0,1885556366484212 0,9813413650830975;

delta_DE_function 2;

flight_last_to_render 0;

formula_1 61;

formula_2 64;

hybrid_fractal_enable true;

image_height 1080;

image_width 1920;

keyframe_last_to_render 0;

mat1_is_defined true;

mat1_surface_color_palette fd6029 698403 fff59c f5bd22 0b5e87 9c6b5f 941a5b 2d52c6 d4ffd4 aba53c;

raytraced_reflections true;

spherical_folding true;

[fractal_1]

IFS_rotation_enabled true;

mandelbox_scale -1,9;

transf_constant_multiplier_111 3 1 1;

[fractal_2]

IFS_abs_x true;

IFS_abs_y true;

IFS_abs_z true;

IFS_direction_0 2,618 1 -1,618;

IFS_direction_1 -1,618 2,618 1;

IFS_direction_2 1 -1,618 2,618;

IFS_enabled_0 true;

IFS_enabled_1 true;

IFS_enabled_2 true;

IFS_offset 1 1 1;

IFS_rotation_enabled true;

IFS_scale 2,618034;

transf_addition_constant 0,3 0 0;

[fractal_3]

IFS_rotation_enabled true;

[fractal_4]

IFS_rotation_enabled true;

Thanks!