Re: How to fix crappy fcurves and pivots on imported Realflow RBD geometry?

[Vincent Ullmann]

Hi Morten,

i dont think its possible to solve this in ICE, becouse you cant change 
the AnimationCurves....
(While tipping this i actually have a Idea....)
anyway....
I found a little snipped in the Web to get the Objects COG in Global 
Space (https://gist.github.com/yamahigashi/9309426)
Now I just wrapped this in a little Loop, and created some PoseConstrains.

After executing the Script, you just have to
- Plot the Nulls Transforms
- Remove the RBDs Transforms
- Parent or Constrain or Envelope the RBD's to the Nulls

Hope this works.
Could'nt test this.... just some thoughts. ;-)
Vincent




Am 14.05.2014 16:22, schrieb Morten Bartholdy:

I need to find a way to fix fcurves and pivots on a large number of 
objects (tumbling boulders) RBD simulated in Realflow (don't ask). 
When they come in they move correctly, but their pivots are way off 
from the geometry and fcurves suffer from gimbal flipping, so 
motionblur obviously doesn't render properly.

I was thinking it would be relatively simple to get good motiondata by 
piping them through ICE, calculate motionvectors for each vertex and 
set the data again. I guess there is a way to move the pivot of each 
object to its centre too, while maintaining the same motion.


It is however way beyond my ICE capabilities, so I am looking for 
tutorials, pointers, scripts or possibly other tools that might do the 
trick.



Thanks


Morten




xsi = Application


"From  https://gist.github.com/yamahigashi/9309426";
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)
 
 

xsi.SetUserPref("SI3D_CONSTRAINT_COMPENSATION_MODE", 1)

# Store Sel
sel = []
for obj in xsi.Selection:
        sel.append(obj)

for obj in sel:
        objCOG = calc_cog_global_position(obj)
        print "Obj: " + obj.Name + " // COG: (" + str(objCOG.X) + "/" + 
str(objCOG.Y) + "/" + str(objCOG.Z) + ")"

        null = xsi.GetPrim("Null", "poseCons_" + obj.Name, "", "")
        xsi.Translate(null, objCOG.X, objCOG.Y, objCOG.Z, "siAbsolute", 
"siPivotCOG", "siObj", "siXYZ", "", "", "", "", "", "", "", "", "", 0, "")
        
        xsi.ApplyCns("Pose", null, obj, True)

xsi.SetUserPref("SI3D_CONSTRAINT_COMPENSATION_MODE", 0)