pyvista.plotting.volume_property.VolumeProperty.opacity_unit_distance

property VolumeProperty.opacity_unit_distance: float

Return or set the opacity unit distance.

This is the unit distance on which the scalar opacity transfer function is defined.

By default this is 1.0, meaning that over a distance of 1.0 units, a given opacity (from the transfer function) is accumulated. This is adjusted for the actual sampling distance during rendering.