This command declares the beginning of a new clump. All subsequent vertices and polygons are added to this clump until a matching ClumpEnd is reached.
A clump is a collection of vertices, polygons, and materials. Clumps are the basic building blocks of all objects. All .rwx files should have at least one ClumpBegin/ClumpEnd pair.
Clumps can be nested (i.e. one ClumpBegin/ClumpEnd pair can be declared inside another). When clumps are nested the object becomes hierarchical, and the inner clump is called a child clump. Since hierarchical objects can take significantly longer to render than non-hierarchical (or "flat") objects, for best performance nested clumps should only be used in RWX files intended for avatars that are to be animated.
This command has no arguments.
Modelbegin ClumpBegin # model code goes in here ClumpEnd ModelEnd
Modelbegin ClumpBegin # model 1 code goes in here ClumpEnd ClumpBegin # model 2 code goes in here ClumpEnd ModelEnd
Another variation required for Collision off
Modelbegin ClumpBegin ClumpBegin # model 1 code goes in here ClumpEnd ClumpBegin collision off # model2 code goes in here ClumpEnd ClumpEnd ModelEnd
Note the nested master clump.