`applyTrackballMatrix` was unused after c4a4a89ef5.
Trackball supports `transform_matrix_fn` although currently not being
used.
This callback is used in the drawing of gizmos.
`applyTrackballMatrix` was unused after c4a4a89ef5.
Trackball supports `transform_matrix_fn` although currently not being
used.
This callback is used in the drawing of gizmos.