Subset of primitives to convert.

What form of conversion to perform.

When converting VDB to dense volumes, create multiple volume primitives per VDB for unconnected regions where possible. This allows very large and sparse VDBs to be converted with less memory usage.

If after converting the VDB, it is still a VDB, it is compared against this class. If it differs, it will be converted to the specified type.

To change the class of the VDB without changing voxel values, use the Primitive SOP.

Change the type of value stored at each voxel.

When converting from a scalar type to a vector type, the scalar value is copied to each vector component.

When converting from a vector type to a scalar type, voxel values are lost – only voxel topology is preserved.

This option is not available when VDB class conversion is enabled, since SDFs and fog volumes always have scalar, floating-point values.

Change the numerical precision of the value stored at each voxel.

The crossing point of the VDB values that is considered the surface when converting to polygons.

The crossing point of the VDB values that is considered the surface when converting to level sets from fog volumes.

After building the VDB grid there may be undetected constant tiles. This tolerance is used to detect constant regions and collapse them. Such areas that are within the background value will also be marked inactive.

Tests areas of inactive background values to determine if they are inside or outside of an SDF, and hence whether they should have negative or positive sign. This toggle has no effect for non-SDF volumes.

Mark all voxels active inside an SDF, even if they match the negative background value. This option is useful if processing the resulting VDB with VEX, which only runs over active voxels of a VDB. However, disabling this option will retain only the narrow active internal band of an incoming SDF if it has one, saving memory and downstream processing. This toggle has no effect for non-SDF volumes, or if Signed-Flood Fill Output is disabled.

How closely to match the surface when converting to polygons. Higher adaptivities will allow more variation in polygon size, using fewer polygons to express the surface.

Compute vertex normals when converting to polygons. This uses the optional second input to help eliminate seams if available.

When converting to polygons with a second input, this is the adaptivity threshold for regions that are inside the reference surface.

When converting to polygons with a second input, this transfers all attributes (primitive, vertex and point) from the reference surface. It will override computed vertex normals for primitives in the surface group.

Sharpen edges and corners.

Controls the edge adaptivity mask.

When converting to polygons with a second input, this specifies a group for all polygons that are coincident with the reference surface. This group is useful for transferring attributes such as uv coordinates, normals, etc. from the reference surface.

When converting to polygons with a second input, this specifies a group for all polygons that are inside the reference surface. These group is useful for creating projected UV coordinates, or for assigning a different material.

When converting to polygons with a second input, this parameter specifies a group for all polygons that are near the seam lines. This can be used to drive secondary elements such as debris and dust.

When converting to polygons with a second input, this parameter specifies a group of the fracture seam points. This can be used to drive local pre-fracture dynamics, such as local surface buckling.

If enabled, specifies the name of the VDB field from the third input to be used for masking. The field’s interior defines the region for converting to polygons.

Iso value used to offset the interior region of the surface mask.

Causes the complement of the surface mask to be converted instead.

If enabled, specifies the name of the VDB field from the third input for controlling adaptivity. The voxel values are multiplied with the Adaptivity parameter value.