View source for Talk:$root

==Rootbone==
I'm trying to write a concise explanation of how the term "[[rootbone]]" is used in Source, but I need to clarify a few things before I can boil it down to the essentials! ... Have I got any of this right ? : 

* Any bone connected ("parented") to the model's Origin is a "root" or "root bone".
: [[$origin]] offsets all of the model's geometry, including the root, from the Entity's WorldPosition.
: [[$root]] redefines which bone_name is "parented" to the Origin, effectively changing the Skeleton's offset from the Origin ?

* There is no flexible [[joint]] where the rootbone connects to the Origin; the rootbone has no [[joint]].
: Therefore: The top-most [[joint]] in the skeleton is where another bone connects to the rootbone. 
: Therefore: the end of the rootbone represents the model's "Center of Movement", whereas the Origin represents the its "Center of Gravity".

* Each [[skeleton]] must have at least one [[rootbone]]. 
: A skeleton may have multiple rootbones; represented in SMD by
 nodes
 0 "rootbone_1_name" -1
 1 "rootbone_2_name" -1
: the purpose of which is ....

Thanks in advance, --[[User:Beeswax|Beeswax]] 12:03, 4 May 2008 (PDT)