TKE_Selectability

Opcode

Variable geometry, Variable down, Variable up,

Variable move_down, Variable move_up, Variable invisible

geometry	Bitmask of affected geometry. 1 byte, if Geo_Extended (high) bit set, an additional second byte follows. All remaining fields are the same size as the `geometry` field. Bit definitions are here.
down	Bitmask of geometry selected by mouse click.
up	Bitmask of geometry selected by mouse release.
move_down	Bitmask of geometry select by mouse motion with button down.
move_up	Bitmask of geometry select by mouse motion with button up.
invisible	Bitmask of geometry which may be selected even if not visible.

This controls which types of geometry in a segment may be selected, and what actions may trigger a selection.

This opcode was not available before HSF version 6.30.