Key Pivot Tool

iamVFX · **Joined:** 24 Sep 2010, 18:28 **Posts:** 595

SI has a pivot transformations that can be keyed without using a Center operator. The awkward thing for me is that this is done by changing the parameters values from the ppg window and translation of the pivot happens relatively to local transformation matrix of the object. So I wrote this handy little script that allow you to just pick a position in space that would be a new pivot center of the current frame

Code:

xsi = Application

frame = xsi.GetValue("PlayControl.Current")

pivot = xsi.PickPosition("Set new pivot position and key it", "Remove key on the current frame")

if pivot[0] == 1:

   v3 = XSIMath.CreateVector3(pivot[1],pivot[2],pivot[3])
   m4x4 = XSIMath.CreateMatrix4()
   obj = xsi.Selection[0]
   obj.Kinematics.Global.Transform.GetMatrix4(m4x4)

   m4x4.Invert(m4x4)

   v3.MulByMatrix4InPlace(m4x4)

   x, y, z = 0, 0, 0
   x, y, z = v3.Get(x, y, z)

   xsi.SetValue("*.kine.local.pposx", x)
   xsi.SetValue("*.kine.local.pposy", y)
   xsi.SetValue("*.kine.local.pposz", z)
   xsi.SavePivotKey(["*"], "siTrn", frame)
   xsi.RotationTool()

elif pivot[0] == 2:
   try:
      xsi.RemoveKey("*.kine.local.pposx,*.kine.local.pposy,*.kine.local.pposz,*.kine.local.pcposx,*.kine.local.pcposy,*.kine.local.pcposz", frame)
   except:
      pass

myara · **Joined:** 28 Sep 2011, 10:33 **Posts:** 82

Softimage has an unbinded command in the Keyboard Mapping that let's you move the pivot.

It's called Edit Transform Tool Pivot in the Transform Tool group.

There is also a Transform Tool Pivot(alternate), but It seems to do the same.

iamVFX · **Joined:** 24 Sep 2010, 18:28 **Posts:** 595

Edit Transform Tool Pivot is a temporary way to move pivot position (same as holding ALT button). My script works directly with pivot kinematic values under local transforms of the object and key them for animation purposes (imagine a rolling cube, for example, which changes its point of rotation with time)

myara · **Joined:** 28 Sep 2011, 10:33 **Posts:** 82

Oh , now I get it!!
Nice tool !

Key Pivot Tool

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