Houdini 20.5 Nodes Geometry nodes

Labs VDB Transform Properties 1.0 geometry node

Converts the input volume/VDB field to a VDB vector field and updates how the vector field will respond to transformations downstream.

Labs VDB Transform Properties SOP changes how a volume/VDB field will respond to transformations applied downstream. It converts the input field to a VDB vector field and updates the vector field’s primitive intrinsic attribute vdb_vector_type.

A common use case is to convert vel.x, vel.y, and vel.z to a VDB contravariant relative vector field so that the velocities can respond correctly to both Transform SOPs and object transforms.

Parameters

Source Field

The name of the volume/VDB field to update. If this is three scalar fields which are components of the same vector field, just type in the name of the vector field. For instance, for vel.x, vel.y, and vel.z, just type in vel.

Vector Field Type

Sets how transformations will be applied to the vector field.

Tuple/Color/UVW: Does not transform.

Gradient/Normal: Applies the inverse-transpose of the transform matrix, ignoring translation.

Unit Normal: Applies the forward transform matrix, ignoring translation.

Displacement/Velocity/Acceleration: Applies the forward transform matrix, ignoring translation.

Position: Applies “regular” transformation, vector translates.

Remove Source Scalar VDBs

Deletes the scalar VDBs once they have been merged into a single vector field.

Output Motion Vector Visualization

Outputs motion vector visualization. You can still revert the volume back to its original look downstream by deleting the detail attribute volvis_motionvec.

Geometry nodes