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