Procedures

For object activity the engine offers various standard procedures which perform typical physical behaviour. In procedure WALK, for instance, the activity automatically changes to "Jump" if the ground under the feet is lost.
Procedure Description Behaviour CNAT
NONE No procedure Only gravitational effects or attachment as specified in the activity. [Action] Attach
WALK Walking According to physical Walk and current COMD-constant group. CNAT_Bottom
FLIGHT Free fall Only gravitational effects CNAT_None
KNEEL Getting up Behaviour according to activity. CNAT_Bottom
SCALE Scaling a wall According to physical Scale and current COMD-constant group. CNAT_Left/Right
HANGLE Climbing on the ceiling According to physical Hangle and current COMD-constant group. CNAT_Top
DIG Dig According to physical Dig and current COMD-constant group. With SetActionData=1 material chunks are dug free. CNAT_None
SWIM Swimming According to physical Swim and current COMD-constant group. CNAT_None
THROW Throw Behaviour according to activity. CNAT_Bottom
BRIDGE Bridge building According to COMD-constant group. Bridge material is a material number in SetActionData. CNAT_Bottom
BUILD Building Builds the target object (SetAction()). CNAT_Bottom
PUSH Pushing Pushes the target object (SetAction()) according to physical push and COMD-constant group. CNAT_Bottom
CHOP Tree felling Chops the target object (SetAction()) according to physical Chop. CNAT_Bottom
LIFT Lifting Lifts the target object (SetAction()) to COMD-constant group. CNAT_None
FLOAT Floating in mid-air According to physical Float and current COMD-constant group. CNAT_None
ATTACH Attachment to another object Adjusts object position at vertex a to the position of vertex b of the target object (SetAction()). a and b are the two low bytes of SetActionData (see SetActionData for an example). CNAT_None
FIGHT Fighting According to physical Fight against target object (SetAction()). CNAT_Bottom
CONNECT Line connections Only line objects. Connects target object 1 and target object 2 (SetAction()). CNAT_None
PULL Pulling Pulls the target object (SetAction()) target object CNAT_Bottom
Procedures are hardcoded in the engine and are from older times in which is was not yet possible to implement the same functionality in script. Most procedures represent highly complex behaviour which is useful only for clonks.
Sven2, April 2002