User:JeffLane
Testing
To create a ladder you must define the volume in which the player will move through space while on the ladder. This includes a starting and end position. The volume is described via the func_useableladder entity. The entity has two positions: a starting point and an ending point (See Fig. 1a) . These can be typed into the key-value fields, or more typically the ladder can be defined by using the visual ladder tool, visible when the entity is selected (See Fig. 1b) . Using this tool you can drag the start and end point of the ladder into appropriate positions in the 2D view. The ladder's start and ending point may be of arbitrary orientation and length (See Fig. 1c). Simply pull the endpoints where you want them and the player will move between these points while on the ladder.
 Fig. 1a - Ladder points |
 Fig. 1b - Changing orientation |
 Fig. 1c - Slanted ladder points |
The ladder's volume must be clear of obstructions. If a solid brush surfaces passes through the space you define, the ladder may not be climbable.
Along with the volume of movement, the ladder also needs "dismount" points (See Fig. 1d). These points are defined using the info_ladderdismount entity. These are markers in space that define where a player can exit a ladder from. They are most easily thought of as hints to good positions to place the player in. When a player reaches the top or bottom of a ladder, the code attempts to find the nearest dismount point to where the player is standing and in the direction the player is looking. If there is a dismount point within a certain threshold tolerance, the player will automatically dismount the ladder and move onto that dismount point. The entity has a keyvalue field called LadderName which holds the name of the ladder it is used by. Like the ladder volume, the dismount points must be free of obstruction and allow the player to stand at their position without intersecting solid world geometry.