Pyro Advect by Map Copernicus node

Advects a VDB by a flow map.

On this page	Parameters Inputs Outputs
Since	21.0

Pyro Advect by Map will move a VDB according to a provided flow map.

Two maps are provided - the forward map stores the original location of a voxel after it had been advected, and the reverse map the opposite.

The reverse map is needed only in the BFECC method.

Parameters ¶

Signature

The VDB type that the source accepts.

See Signatures for more information.

Method

The method used to advect the VDB.

BFECC

Perform backwards-forward error correction. This requires considerable time and memory; but does the best job of preserving the sharpness of features.

Euler + Sharpen

Combines the simplest form of advection with a dynamic sharpen field that combats the diffusion introduced by the trilinear operation.

Euler

The simplest and fastest form of advection, but tends to cause excessive blurring.

Sharpen

How much to sharpen the VDB. This is automatically adjusted per voxel based on how the VDB was sampled. While the sharpening kernel is clamped, a value that is too high will create grid artifacts.

Inputs ¶

source

A vector or float VDB to advect.

fwdmap

A vector VDB map defining where voxels came from during forward advection.

revmap

A vector VDB map defining where voxels came from during backwards advection.

Outputs ¶

advect

The source advected.

See also

Copernicus nodes

Auto Stereogram

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Bake Geometry Textures

Generates textures by baking between a low-resolution and high-resolution mesh at interactive speeds.
Bend

Curves images using handles or a captured region.
Blend

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Block Begin

Start of a block, containing its inputs.
Block End

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

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Blur

Applies a blur to a layer.
Bokeh

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Bounding Rectangle

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Bright

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Bubble Noise

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Cable Filter

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Cable Pack

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Cable Split

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Camera Properties

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Channel Join

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Channel Split

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Channel Swap

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Color Correct

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Constant

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Contact Sheet

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Crop

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Cross Product

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Cryptomatte

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Cryptomatte Decode

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Cryptomatte Encode

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Curvature

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Defocus

Defocuses an input layer.
Denoise AI

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Denoise TVD

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Derivative

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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

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Extrapolate Boundaries

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

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Fetch

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File

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Fill

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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

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Height to Normal

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Height to Shadow

Creates shadows using a virtual light source.
HeightField Visualize

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Hex Tile

Randomly tiles texture.
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

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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

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Layer from Curves

Render Curves into a Layer.
Layer from VDB

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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

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Mirror

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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

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Null

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OCIO Transform

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ONNX Inference

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OpenCL

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Output

Collects the outputs of a subnetwork.
Phasor Noise

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Pixelate

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Polar to UV

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Position Map

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Position Sample

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Prefix Sum

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Premultiply

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Preview Material

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Project on Layer

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Pyro Activate

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

Advects VDBs by Velocity.
Pyro Advect by Map

Advects a VDB by a flow map.
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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.
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Constructs a flow map from a velocity VDB.
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Configures a Pyro simulation.
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Pyro Uniform Force

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RGBA to RGB

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RGBA to UV

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Random RGB

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Rasterize Curves

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Rasterize Geometry

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Rasterize Layer

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Rasterize Setup

Prepares geometry for the Rasterize Geometry COP.
Rasterize Volume

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Ray Trace

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Reaction-Diffusion Block Begin

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

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Remap

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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

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Slope Direction

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Smooth Fill

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Solve Poisson Multigrid

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Space Transform

Transforms positions and UV values between spaces.
Stamp Points

Stamps layers from point positions.
Stash

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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

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Switch

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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

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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.