Houdini 21.0 Nodes Copernicus nodes

VDB Visualize Slice Copernicus node

Extracts a slice from a VDB as Geometry for visualization.

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Since 21.0

This operation creates a mesh geometry of a slice of a VDB, allowing the voxels to be directly visualized. Since they are point attributes, they can also be viewed in the Geometry Spreadsheet.

This provides the functionality of the Volume Slice SOP, but does so directly in COPs to avoid having to change contexts.

Parameters

Plane

What axis to extract from the volume. This is local to the volume’s space. Rotated or transformed volumes will have a corresponding rotated or transformed plane.

Relative Location

Controls if the slicing plane will be relative to the volume or in world coordinates. Relative ensures that volumes will always generate a slice through their data. Absolute ensures that animated volumes don’t have their slices jump around.

Position

The center of the point to start slicing from when in world coordinate mode.

Offset

Where the plane should be positioned inside the volume. In Relative Location mode, this is a relative coordinate, with -1..1 being the total range, so 0 means the center of the volume.

In world coordinate mode, this is added to the world-axis perpendicular to the selected plane. Note that if the volume is rotated this will not align with the volume’s axes.

Snap to Voxel

The points of the slice match the actual voxel coordinates along the slice plane direction, but if the slice offset itself doesn’t go through a voxel, they will be a blend of two voxels. Snapping ensures that values in the resulting slice are values in the original voxels and not blended.

Visualization Min

The VDB values that correspond to the beginning of the visualization ramp.

Visualization Max

The VDB values that correspond to the end of the visualization ramp.

Visualization Ramp

The color scheme for visualizing the attribute values. This is used if there is only one volume present, otherwise the first three volumes are mapped to red green and blue.

Inputs

vdb

A Float, Vector or Integer VDB to visualize. If it is an Integer VDB, it will be converted to a color through the ID to RGB COP internally first.

Outputs

slice

A Geometry of the mesh of extracted points.

See also

Copernicus nodes