28 lines (27 with data), 712 Bytes

Line = { 
#var AnyVec3 RGB1 = { iffun(.is_optimized,0, 1), iffun(.is_optimized,1, 0), 0};
#var AnyVec3 RGB2 = RGB1;
#var AnyVec3 RGB3 = RGB2;
#var AnyVec3 RGB4 = RGB3;
#var AnyVec3 RGB5 = RGB4;
#var RGB = RGB5; 
};
Opacity = iffun(bool(sum(...Driver.WeightPos)), 1.0, 0.2);
#var AnyVar size=.Arrows.size;
#ifdef _MOCAP_HIDE_MARKER_ARROWS_
#var Visible = Off;
#else
#var Visible = On;
#endif
Line.Style = Line3DStyleFull;
Line.Thickness=0.1*size;
Line.End.Thickness =0.3*size;             
Line.End.Length =0.4*size;             
Line.End.Style=Line3DCapStyleArrow;
PointAway = On;
GlobalCoord=Off;
DrawCoord=On;
TextFont.Height=25;
TextFont.Width=9;
TextRelPos=0.9;
TextFont.Bold =On;