b3d format explain ?

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Can anyone could explain why in the b3d format, the brushcolors are stored with values within range 0, 1 ?

as , it is stored in float, and we could instead use an integer that can take less space in the file and is faster.

work same for vertexcolor etc...

other question :
what is the fourth rotation for the bones ?

NODE:
char name[] ;name of node
float position[3] ;local...
float scale[3] ;coord...
float rotation[4] ;system...
[MESH|BONE] ;what 'kind' of node this is - if unrecognized, just use a Blitz3D



I know pitch, yaw , roll ... what is the last ? the external dimension that hapen only when ufo comes in earth ? :D ...