Pyro Dissipate Copernicus node

Dissipates a VDB’s values over time.

On this page	Parameters Mask by Control Field Mask along Axis Limit Values Inputs Outputs
Since	21.0

The Pyro Dissipate COP performs several types of dissipation on the input VDB. This will drive the VDB’s value to the goal value (usually zero), causing the smoke to disappear over time. An optional control field can be used to affect where the dissipation occurs.

Parameters ¶

Signature

The VDB type that the source accepts.

See Signatures for more information.

Mode

Controls the rate by which to dissipate the VDB.

Dissipation Rate

The percentage of the current amount to be lost per fixed interval (per second).

Subtraction Rate

Specific amount to be lost per fixed interval (per second).

Lifespan

The interval (per second) in which a fixed amount (1 unit) to be lost.

Half-Life

The interval (per second) in which half the amount to be lost (half-life).

Dissipation Rate

The percentage of the current amount to be lost per fixed interval (per second).

Subtraction Rate

Specific amount to be lost per fixed interval (per second).

Lifespan

The interval (per second) in which a fixed amount (1 unit) to be lost.

Half-Life

The interval (per second) in which half the amount to be lost (half-life).

Goal Value

The reference value to which the field will cool to, usually zero.

Goal Tolerance

When turned on and the VDB’s value cools below Goal Value + Goal Tolerance, the VDB’s value will be driven down all the way to the Goal Value.

Mask by Control Field ¶

Mask out the effect of the force by the control field. Control fields are usually used the same way as masks, so represent a smooth engagement of the effect.

Mask along Axis ¶

It is common for effects to be scaled along one particular axis. Rather than requiring the construction of VDBs to represent this; this allows the direct specification of the world space range over which the effect is to be scaled.

Limit Values ¶

Minimum Limit

The output VDB is clamped below by this value.

Maximum Limit

The output VDB is clamped above by this value.

Inputs ¶

source

A Float VDB or Vector VDB to drive to a goal value.

control

A Float or Vector VDB to use as a control field. If it is a Vector VDB, its length is used.

Outputs ¶

dissipate

The input VDB dissipated.

See also

Copernicus nodes

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Blend

Blends two layers together.
Block Begin

Start of a block, containing its inputs.
Block End

End of a block, declaring its outputs.
Block to Geometry

Compiles a block and produces its geometry representation.
Blur

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Bokeh

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Bounding Rectangle

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Bubble Noise

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Cable Filter

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Cable Merge

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Cable Pack

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Cable Rename

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Cable Split

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Cable Unpack

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Camera Properties

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Channel Extract

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Channel Join

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Channel Split

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Channel Swap

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Combine Normals

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Contact Sheet

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Crop

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Cryptomatte

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Cryptomatte Decode

Decodes a cyrptomatte into coverage and ID.
Cryptomatte Encode

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Defocuses an input layer.
Denoise AI

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Denoise TVD

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Derivative

Computes the derivative of the source layer along the x- and y-axis.
Dilate Erode

Dilates or erodes a layer.
Distort

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Dot Product

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Edge Detect

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Edge Detect by Contour

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Edge Detect by Depth

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Edge Detect by Normal

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Eikonal

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Equalize

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Error

Generates a message, warning, or error.
Extrapolate Boundaries

Fills empty areas of an image using colors at the edges of non-empty areas.
Feather

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Fetch

Brings a COP node’s outputs into the current network.
File

Loads an image or video from disk.
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Fill Connected

Flood fills the connected regions of a layer.
Flip

Flips a layer horizontally, vertically, or diagonally.
Flow Block Begin

Start of a Flow simulation block.
Flow Block End

End of a Flow simulation block.
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Font

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Fractal Noise

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Fractal Noise 3D

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Function

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Gamma

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Geometry to Layer

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Glow

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HSV Adjust

Converts between RGB and HSV color spaces, or modifies HSV.
Heat Distort

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Heat Distort by Layer

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Height to Ambient Occlusion

Imagines a sphere for each pixel and determines how occluded that sphere is based on its surroundings.
Height to Normal

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Height to Shadow

Creates shadows using a virtual light source.
HeightField Visualize

Visualizes layers as colored heightfields.
Hex Tile

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Histogram

Builds a histogram from a layer.
Hyperbolic Tile

Generates hyperbolic polygon tiles for texture patterns.
ID to Mask

Creates a mask from an ID layer based on filtering parameters.
ID to Mono

Converts an ID layer into a mono layer.
ID to RGB

Converts an ID layer into an RGB layer.
ID to SDF

Computes a Signed Distance Field from changes in ID values.
Illegal Pixel

Detects and then fixes or highlights illegal pixels in images.
Input

Fetches the input to a subnetwork.
Integrate Volume

Simple integration of a VDB along camera rays.
Invert

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Invoke Block

Runs a block using inputs plugged into this node.
Invoke Geometry

Runs a program saved into geometry using inputs plugged into this node.
Julia Fractal

Computes the Julia set to create a fractal.
Kuwahara Filter

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Lattice Deform

Applies grid-based deformation to a layer.
Layer

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Layer Attribute Create

Adds or edits user-defined metadata on a layer.
Layer Attribute Delete

Removes user-defined metadata from a layer.
Layer Properties

Edits basic layer metadata.
Layer from Curves

Render Curves into a Layer.
Layer from VDB

Sets a layer’s values from a VDB.
Layer to Geometry

Converts a layer into a 2D volume.
Layer to Points

Creates points based on a layer.
Layer to VDB Leaf Points

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Lens Distort

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Light

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Live Video

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Mask from Curves

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Match Camera

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Match UDIM

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Median

Applies a median filter to an image.
Mirror

Mirrors an image based on an arbitrary number of planes.
Mono

Converts a layer to mono.
Mono to ID

Converts a mono layer into an ID layer.
Mono to RGB

Converts a mono layer into an RGB layer.
Mono to RGBA

Converts a mono layer into an RGBA layer.
Mono to SDF

Computes a signed distance field from an iso-level of a mono layer.
Null

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OCIO Transform

Converts color spaces using OCIO transforms.
ONNX Inference

Applies inference from an ONNX Machine Learning model.
OpenCL

Executes an OpenCL kernel on layers, attributes, volumes, and VDBs.
Output

Collects the outputs of a subnetwork.
Phasor Noise

Generates phasor noise, which resembles a wave pattern.
Pixelate

Increases the size of pixels to pixelate an input layer.
Polar to UV

Converts polar coordinate pixels to Cartesian pixels.
Position Map

Generates a position map.
Position Sample

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Prefix Sum

Computes the prefix sum of a layer.
Premultiply

Premultiplies or un-premultiplies an RGBA layer.
Preview Material

Applies the preview material to geometry.
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Projects a layer onto a target layer.
Pyro Activate

Changes the activation of VDBs in a Pyro simulation.
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Pyro Advect by Map

Advects a VDB by a flow map.
Pyro Axis Force

Applies a force around an axis to a velocity VDB.
Pyro Block Begin

Start of a Pyro simulation block.
Pyro Block End

End of a Pyro simulation block.
Pyro Build Advection Map

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Pyro Buoyancy

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Pyro Configure

Configures a Pyro simulation.
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Dissipates a VDB’s values over time.
Pyro Disturbance

Applies disturbance to a velocity VDB to break up still air.
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Builds a light field of ambient illumination of a VDB.
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Builds a light field of internal glow of a VDB.
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Pyro Source from Layer

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Pyro Source from Points

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Pyro Turbulence

Apply turbulence to a velocity VDB.
Pyro Uniform Force

Applies a uniform force.
Python Snippet

Runs a snippet of Python on layers.
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Quantizes input data into discrete steps.
RGB to RGBA

Converts RGB layers to RGBA.
RGB to UV

Splits an RGB layer into UV and mono layers.
RGBA to RGB

Converts RGBA layers to RGB.
RGBA to UV

Splits an RGBA layer into two UV layers.
ROP Image

Writes the output of a COP network to disk.
Ramp

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Random Mono

Creates a mono layer with random values.
Random RGB

Creates an RGB layer with random colors.
Rasterize Curves

Rasterizes curves onto a layer.
Rasterize Geometry

Rasterizes geometry onto a layer.
Rasterize Layer

Rasterizes a layer onto another layer’s camera.
Rasterize Setup

Prepares geometry for the Rasterize Geometry COP.
Rasterize Volume

Renders a volume viewed through a camera
Ray Trace

Performs ray tracing on an input mesh based on an origins and directions map.
Reaction-Diffusion Block Begin

Start of a Reaction-Diffusion simulation block.
Reaction-Diffusion Block End

Creates unique patterns by solving the reaction and diffusion of multiple chemicals as described by its inputs and parameters.
Remap

Remaps a layer.
Resample

Performs image scaling by changing the width, height, and pixel sizes.
SDF Adjust

Modifies the values for a Mono SDF layer.
SDF Blend

Combines two Mono SDF layers.
SDF Shape

Builds a 2D signed distance field of a selected shape.
SDF to Mono

Converts an SDF field to a Mono image layer.
SDF to RGB

Converts an SDF field to an RGB color layer.
SOP Import

Imports SOP geometry into Copernicus.
SOP Invoke

Invokes a compiled SOP block on the inputs.
SOP Invoke Graph

Invokes a geometry SOP graph on the inputs.
Scatter Shapes

Scatters input stamps across the image using randomization controls.
Scatter on Curves

Scatters input stamps along an input curve using randomization controls.
Segment by Connectivity

Segment a layer into connected components.
Segment by Value

Segment a mono layer into bands of similar value.
Sequence Blend

Blends multiple image inputs by a blend factor.
Sharpen

Sharpens an input layer to increase the definition of its edges.
Slap Comp Import

Import live layers from the Solaris Viewport.
Slope Direction

Converts a height layer into a direction layer.
Smooth Fill

Smoothly fills a region of a layer.
Solve Poisson Multigrid

Solves Poisson’s equation in a rectangular region using geometric multigrid.
Space Transform

Transforms positions and UV values between spaces.
Stamp Points

Stamps layers from point positions.
Stash

Stashes the input of the node on command and uses it as the node’s output.
Statistics

Outputs the average, minimum and maximum values of the input layer
Statistics by ID

Compute statistics for each ID island.
Streak Blur

Streaks an image, adding a motion blur effect.
Subnetwork

Used to organize a collection of COPs into one node.
Surface Dither

Applies a halftone dithering pattern relative to UVs.
Swirl

Twists an image layer into a spiral shape.
Switch

Selects an input layer.
Switch If Wired

Selects an input based on what is connected.
Switch by Type

Selects an output layer by the type of the inputs.
Tile Pattern

Generates rectangular tiles for texture patterns.
Tone Map

Applies a filmic tone mapping curve to compress a high dynamic range input into a displayable range.
Transform 2D

Transforms a layer in 2D.
Transform 3D

Transforms a layer in 3D.
Triplanar

Generates a texture by projecting X, Y, and Z textures onto the position layer.
Triplanar Hex Tile

Seamless texturing and normal mapping of triplanar projections without visible repetitions.
Triplanar UV

Generates UVs in three orthogonal projections.
Two Way Switch If Wired

Selects between two inputs based on if you wire in another input.
UV Map

Generates a UV Map.
UV Map by ID

Creates a UV Map for each connected ID island.
UV Sample

Samples an input layer using a UV layer.
UV Transform

Transforms the values of a UV layer in 2d space.
UV to Polar

Converts Cartesian coordinate pixels to polar coordinate pixels.
UV to RGB

Joins a UV and mono layer into an RGB layer.
UV to RGBA

Joins two UV layers into an RGBA layer.
VDB Activate from Points

Activates leaves on a VDB according to a point cloud.
VDB Leaf Points

Creates a point for each active leaf in a VDB.
VDB Position Map

Stores in each voxel that voxel’s position.
VDB Reshape

Rebuilds a VDB to match another VDB’s topology.
VDB Visualize

Creates multi-volume visualization.
VDB Visualize Slice

Extracts a slice from a VDB as Geometry for visualization.
VDB Visualize Tree

Builds a geometry visualizing the topology of a VDB.
VDB Visualize Velocity

Traces streamers through a velocity VDB.
VDB from Layer

Sets VDB values from the closest values in a layer.
Vector Transform

Transforms values of an RGB layer in 3d space.
Vector Transform 2D

Transforms the values of a UV layer in 2D space.
Vignette

Darkens the corners of an input layer.
Wipe

Performs a wipe transition between two images.
Worley Noise

Generates Worley noise.
Worley Noise 3D

Generates Worley noise from 3D locations.
Wrangle

Runs a VEX snippet to modify layer values.
Z Composite

Composites two layers by depth.