Notch Notch Manual 0.9.23
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Reaction Diffusion

Reaction Diffusion

Generates a reaction-diffusion simulation for a field.



Method #

Performs reaction-diffusion simulation, using an image input as a seed.

This node simulates the Gray-Scott reaction-diffusion process, which can be thought of as a kind of fluid simulation with an extra step that creates organic-like patterns which grow out from seed points. Those points are created by sampling an input image, and seeds are created at the brighter parts of the image.

More information on the general topic of reaction-diffusion simulation can be found here The following image sequence shows how the pattern will grow out from a single point during the course of a simulation.

Growth Example #

fields-reactiondiffusion-growth-1 fields-reactiondiffusion-growth-2 fields-reactiondiffusion-growth-3 fields-reactiondiffusion-growth-4


These properties control the 3D transforms of the node. Transforms will generally be inherited by child nodes, although they can be ignored through the Inherit Transform Channels attributes.

Position XMove along the local x-axis.
Position YMove along the local y-axis.
Position ZMove along the local z-axis.
Rotation HeadingRotate around the local y-axis.
Rotation PitchRotate around the local x-axis.
Rotation BankRotate around the local z-axis.
Scale XScale along the local x-axis.
Scale YScale along the local y-axis.
Scale ZScale along the local z-axis.

Toggle which transform channels should be inherited from the parent node. By default, all transforms will be inherited.

Position XToggle inheritance of the X Position from the parent.
Position YToggle inheritance of the Y Position from the parent.
Position ZToggle inheritance of the Z Position from the parent.
Rotation HeadingToggle inheritance of the Rotation Heading from the parent.
Rotation PitchToggle inheritance of the Rotation Pitch from the parent.
Rotation BankToggle inheritance of the Rotation Bank from the parent.
Scale XToggle inheritance of the X Scale from the parent.
Scale YToggle inheritance of the Y Scale from the parent.
Scale ZToggle inheritance of the Z Scale from the parent.
World Position OnlyInherit the world position from the parent only, rotation and scale will be ignored. Overrides above properties.
Inherit TimeToggle inheritance of time from the parent.

These properties control the core behaviours of the node.

ColourThe colour the reaction diffusion generates into the scene.
AmountThe amount of the input image to use as seed.
PatternHow much the reaction diffusion attempts to join blobs into lines.
RateSpeed at which the reaction diffusion spreads and attempts to fill the space.
Input ScaleScale of the input images luminance to generate the reaction diffusion.
SoftnessHow soft the edges of the generated reaction diffusion are.


NameDescriptionTypical Input
Colour RampSpecify a range of colours the generator can use through its gradient.Colour Ramp
Transform ModifiersApply the transforms of another node to this node.Null
Target NodeModifiy the rotations of the node to always direct the z axis towards the input.Null
Local Transform OverrideApply the transforms of another node to this node, relative to its parent.Null