Few Houdini Questions:-

1)how to emitt particles only when impact data is greater than 30?
   if(clamp(point("../dopimportrecords1",$PT,"impulse",0),1,36)>30,1,0)
 using dop field:
if(clamp(dopfield("/obj/AutoDopNetwork","piece0","Impacts","Impacts",3,"impulse"),1,36)>30,1,0)

2)Move object in circle in xz plane
   in x and y tanslation put following expressions..
x=sin($T*40)*4
y=cos($T*40)*4
3)Enable or disable rbd state, if dopobjects are in the attribute group..using adjascent glue.
In active value node ...
`pointlist("/obj/glue_piece0_to_piece99/red","red")`
pointlist("pathOfGroup","groupName")

4)Create Basic Chains
   -create chain using duplicate sop (rotate 90 on each copy)
-create rbd fractured object
-create a pin constaint (remove goal field)
-change solver to rbd and increase collision passes to 50

5)Any Dvd Cutter: to cut the clips from dvd's
    Arvee player

6)Export Boujou Camera to Houdini
   export camera as houdini 4.1, it ll save as .hip file

7)Export from Boujou to Nuke

 press [x] to execute a script command and type :
import_boujou 
as a TCL script. 
You will need to export the camera and tracks as a .txt file from boujou (its the last export option). 
This will make a you a scene containing your tracks with individual transform geos for position.