Procedures

For object activity the engine offers various standard procedures which perform typical physcial 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 ComDir.	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 ComDir.	CNAT_Left/Right
HANGLE	Climbing on the ceiling	According to physical Hangle and current ComDir.	CNAT_Top
DIG	Dig	According to physical Dig and current ComDir. With Data=1 material chunks are dug free.	CNAT_None
SWIM	Swimming	According to physical Swim and current ComDir.	CNAT_None
THROW	Throw	Behaviour according to activity.	CNAT_Bottom
BRIDGE	Bridge building	According to ComDir. Bridge material is a material number in Data.	CNAT_Bottom
BUILD	Building	Builds the target object.	CNAT_Bottom
PUSH	Pushing	Pushes the target object according to physical Push and ComDir.	CNAT_Bottom
CHOP	Tree felling	Chops the target object according to physical Chop.	CNAT_Bottom
LIFT	Lifting	Lifts the target object according to ComDir.	CNAT_None
FLOAT	Floating in mid-air	According to physical Float and current ComDir.	CNAT_None
ATTACH	Attachment to another object	Adjusts object position at vertex a to the position of vertex b of the target object. a and b are the two low bytes of ActionData (see SetActionData for an example).	CNAT_None
FIGHT	Fighting	Fight against target object according to Fight physical.	CNAT_Bottom
CONNECT	Line connections	Only line objects. Connects target object 1 and target object 2.	CNAT_None
PULL	Pulling	Pulls the target object according to physical Push and ComDir.	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.