選択オブジェクトを cog の高さで整列する, calculate object's cog position in global #softimage

calc_cog_global_position.py

def calc_cog_global_position(obj):
    ''' calculate objects cog position in global space. returns vector3 '''
    
    #x, y, z, b1, b2, b3 = Application.Selection(0).ActivePrimitive.Geometry.GetBoundingBox()
    #v = XSIMath.CreateVector3(x, y, z)
    if obj.ActivePrimitive.Geometry is not None:
        x = obj.ActivePrimitive.Geometry.Points
        v = XSIMath.CreateVector3()
        for p in x:
            v.Add( v, p.Position) 
        v.Scale(1.0 / x.Count, v)
        res = XSIMath.MapObjectPositionToWorldSpace(obj.Kinematics.Global.Transform, v)

        return res

    else:
        t = obj.Kinematics.Global.Transform
        return XSIMath.CreateVector3(t.PosX, t.PosY, t.PosZ)


# sort by object height
x = sorted([x for x in Application.Selection],
        key=lambda x: calc_cog_global_position(x).Y,
        reverse=True)