Multi FBM

Multi FBM

Features ›› Procedural Nodes ›› Noise Nodes ›› FBM ››
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Multi FBM by Jens Kafitz









Multi FBM is a freely configurable multiFractal. It consists of 3 different Noises - a main FBM ('Base') and 2

secondary ones ('Handle A' , 'Handle B') that can be used to drive any attribute from the 'Base' Noise.


Samples


Please note samples were created with an older version of multi FBM. Some small UI & behavior changes exist in current versions.



Videos


Comprehensive Feature Overview of FBM and MultiFBM however based on an older version:



'Added' Feature Overview of FBM, MultiFBM and Vec FBM:



Options


Color


The two colors that make up the final look of the procedural.


Base (FBM Noise)





Understanding Noise terminology


For some background information on the terms below please refer to

Understanding some basic noise terms



Size of fractal features on your model


Describes the level of detail of the noise. Detail is created by encapsulating the modifiers below into a loop and

running it multiple times incrementing the values from loop to loop.



Octaves mapped with Handle A by default


By default the Base Group's Octaves Attribute is mapped with the Output of Group 'Handle A' so changing the slider won't do anything unless the mapping is changed in the dropdown HandleA.



Controls the size of the secondary fine details.


Lacunarity changes on a simple noise



Amplitude affects the length and amount of fine detail the Lacunarity is contributing to the base pattern


Raising Amplitude on a regular FBM Noise


Offsets Size and Lacunarity against each other. High offset Values will result in a very detailed but spotted result,

with very few large features.


Raising Offset on a regular FBM Noise


A random start value for your fractal.

Changing the seed changes the overall look of your fractal while the general feature look stays the same,  allowing for quick variation with a general look theme.


The amount to multiply the noise's amplitude by, contrasting the noise..

A Gain of 0.0 will result in the value defined under Baseline.


Defines the Value at which point incoming colors/values go to black (incoming values to the left of the set slider value)

or white (incoming values to the right of the set slider value).


Used to visually soften the thresholding, it defines the Upper+Lower Bound of the Threshold

For example with a Threshold Value set to 0.5 and a Edge Value of 0.1, incoming values lower than 0.4

will be black and incoming values higher than 0.6 will be white. Between 0.4 and 0.6 will be a soft gradient.


When generating a Noise, values are often generated from -1.0 to 1.0.

Absolute Values will convert any negative Value to a positive one giving more 'solid' noise results.


Absolute Values turned off/on on a regular FBM


Clamps the noise calculation to a 0-1 range.

Color A/B are applied after the Clamping, so you can still set values above 1 if you choose to

however by clamping the Noise calculation the color mixing between the two colors works more

reliably. In general this should be left on.


Inverts the result of the noise. Inversion is done before color A and B are applied.



Handle A + B



Handle A + B


Handle A or B represent a second and third FBM Noise that can be mapped to drive any attribute of Group 'Base'. Output Values are defined by the NewMin / NewMax Attributes within each Handle Group.



Will show you just the resulting Noise that 'Handle A'  (or B) is outputting making it easier to isolate its contributions to the final look.

New Min / New Max Attributes from 'Handle' Group are ignored for this preview.


The Handle Dropdown Menu will allow you to set which Attribute from the Group 'Base' the Noise created by 'Handle A' (or B)  should drive.

By default HandleA it is set to modify the 'Octaves' of the Group 'Base'.


Size of fractal features on your model for Noise created by Handle A or B.


Describes the level of detail of the noise created by Handle A or B. Detail is created by encapsulating the modifiers below into a loop and

running it multiple times incrementing the values from loop to loop.


Controls the size of the secondary fine details  of the noise created by Handle A or B.



Amplitude affects the length and amount of fine detail the Lacunarity is contributing to the base pattern of Noise created by Handle A or B.


Offsets Handle A or B's Size and Lacunarity against each other. High offset Values will result in a very detailed but spotted result,

with very few large features.


The amount to multiply the noise's amplitude by, contrasting the noise..

A Gain of 0.0 will result in the value defined under Baseline.


A random start value for your fractal.

Changing the seed changes the overall look of your fractal while the general feature look stays the same,

allowing for quick variation with a general look theme.






Remapping Handle A + B Values


By default the values coming out of a noise are ranged from values 0.0 to 1.0.

To accurately map another noise's attributes we need the ability to remap the noise.


Example:


FBM Noise sliders support 1 to 8 octaves.

Mapping another noise to drive the octaves would give us a maximum of 1 octave because the input noise values can't go over 1.0.

With the help of the NewMin and NewMax Attributes we can set a new range for the noise.

NewMin represents the minimum value each noise should ouput, NewMax the maximum value.


By setting NewMin and NewMax to the same value you would effectively reduce the contrast of

the input noise and givie it a flat constant value.




Represents the minimum value the noise from the current Handle should output to the mapped Attribute from group 'Base'.


For example with HandleA mapped to drive the Number of Octaves of group 'Base', the NewMin represents the minimum number of

octaves the base noise should have.


Represents the maximum value the noise from the current Handle should output to the mapped Attribute from group 'Base'


For example with HandleA mapped to drive the Number of Octaves of group 'Base', the NewMax represents the highest number of

octaves the base noise should have.


FBM Noises are generated in a value range of -1.0 to 1.0. In the final result of MultiFBM, Negative as Black will convert areas to black

that are in a negative value range in the Noise output by the Handle group.



FBM Noises are generated in a value range of -1.0 to 1.0. In the final result of MultiFBM, Negative as Transparent will make areas transparent

that are in a negative value range in the Noise output by the Handle group.


Transform Space


By default this procedural is generated in 3D World Space. This results in a seamless noise across UV seams.

By turning on UV Space the procedural is generated based on your UVs, resulting in seams between UV tiles/UDIM & uv shells.


Utilizing Transform Controls such as Scale (see below) you can apply a non-uniform transform to the procedural

to make use of specific UV layouts


Determines which Noise results will be affected by transformations made in the Transform Scale, Transform Rotate Transform Translate Groups

(see below)


Transform Scale


Will apply a scale along X,Y or Z to your noise. This is useful for creating patterns like woodgrain, drips etc.

When UV Space is turned on Scale Z is ignored.

Transform Rotate


Will apply a rotation in X,Y or Z to your noise. When UV Space is turned on Rotate X & Rotate Y are ignored

and rotation is done around the center of each UV Tile/UDIM using Rotate Z.

Transform Translate


Will apply an offset in X,Y or Z to your noise. When UV Space is turned on Translate Z is ignored.



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