When the Contrail Actions item is selected in the Level Routines Window's Actions to Perform column, the following set of controls appears in the panel on the right side of the Level Routines window. These controls are used to configure the contrail related actions that are carried out when the selected routine is performed in the game.
Create Contrail Checkbox
Determines whether a contrail is created when the selected routine is performed
Contrail Type Pop-Up Menu
Determines which type of contrail is created when the selected routine is performed. The Edit button may be used to edit the game project's contrail types.
Create Contrail At Fixed Location Radio Button
Determines whether a pair of fixed coordinates are used to determine the location of the new contrail when the selected routine is performed
Contrail Location X and Y Fields
Determines the location of the new contrail
Use a Pair of Variables To Determine Location Radio Button
Determines whether a pair of variables is used to set the location of the new contrail when the selected routine is performed
Contrail Variable Location X and Y Bevel Buttons
Determines which variables are used to set the location of the new contrail when the selected routine is performed
Contrail Horizontal Speed Field
Determines the initial rightward speed of the contrail that is created when the selected routine is performed
Contrail Downward Speed Field
Determines the initial downward speed of the contrail that is created when the selected routine is performed
Only Create Contrail If Contrail Would Be On Screen Checkbox
Determines whether the new contrail is only created if it would be on the screen. This checkbox should be checked if this routine is performed often, to prevent a huge number of contrails from being created while the player is elsewhere.
More information on contrails is available in the Elements of a Game section.