Portal funneling

Portal funneling is a game mechanic in the Portal series. It automatically corrects the positions of players and objects moving at a high speed towards a portal, so that they go perfectly into the portal rather than potentially hit the rim, much to the player's annoyance. It also appears to sometimes affect trajectory after the object goes through a portal. Note that players must be looking at a portal when funneling into it.

In Portal, funneling can be toggled in the options menu. In Portal 2 it can only be disabled by console command.

Related console commands and variables

ConVar/Command	Parameters or default value	Parameter Type	Effect
sv_player_funnel_into_portals	1	0 disables, 1 enables	Enables funneling.
portal_funnel_debug	0	0 disables, 1 enables	Prints debugging info to the console when funnel code is triggered.
speed_funnelling_enabled	1	0 disables, 1 enables	Enables funneling when running on propulsion gel. (Note that the command spells "funneling" incorrectly.)
sv_player_funnel_gimme_dot	0.9	arbitrary number [Confirm]	When set to higher than 1, player trajectory will never be forced to be perpendicular to the portal after crossing it.
sv_player_funnel_height_adjust	128	World units	When the player is this far above a portal on the ground, funneling will occur. Below this height, none will happen.
sv_player_funnel_snap_threshold	10.0		To do: Effect description.
sv_player_funnel_speed_bonus	2.0		To do: Effect description.
sv_player_funnel_well_above	256.0		To do: Effect description.
sv_props_funnel_into_portals	1	0 disables, 1 enables	Enables funneling for objects such as prop_weighted_cubes.
sv_props_funnel_into_portals_deceleration	2.0		To do: Effect description.