Hello every one
I am wonder how to start RBD as a passive object and turn to active when it collided.
I tried turn off “create active objects”, but it will not be active even got collide.
and “RBD auto freeze dop” is not what I want, too.

can someone give me a idea, please.

thank you!

I think you should use RBD Solver and Static Solver with together to do this (or maybe we have better solution , i don't know)

check attached file and read Notes that i wrote on it.

In this sample a passive Box object change to Active object when an sphere hit to it .

Hi Joker, thank your file! but I still has a problem need help.
I changed your network because I want to do RBD Fracture object. every thing is right but the“JK_RBD_Static_Solver” is not. it can't get my point attribute correctly if I use a variable in expression:
point(“../../box_object1/JK_Take_Collison/OUT_active1”,$OBJID-4,“active”,0)

if I use $OBJID it will don't work. what should I do?
thank you!

p.s.
upload wrong attach file so I deleted it. the new in below reply.
jk_rbd_static_solver_555

Can you attach your file or somethings like that my friend ?

oops, I'm sorry I uplaod the wrong file.
re uploaded, please download it again.
thank you

in obj level can see piece become red when hit

Why dont you use gluenetwork to keep fractured objects togather, there is a tutorial on SideFX website, bullet dynamics. There is also very good Digital tutors lesson - Controlling Your Fractures in Houdini.

Hi Kreahk, thank your advice. I like glue,too.
but I still wonder a way to make a sleeping object because I think some time will need.

Do you mean passive object? If it's the case, you can use a “RBD keyframe Active” node to switch between active and passive state

thank you Ioness!
yes I mean passive. but I don't know how to use “RBD kyeframe active” to active when it hit by something. I think in a fracture sim set key by hand isn't a good way…
after saw Joker's hip I notice that if turn off “Create Active Object” the RBD object can't recevie impact data. I guess this is why Joker said “should use RBD Solver and Static Solver with together”. so even “Active Value” can turn RBD to active, but I don't know how to get impact data from a "non-active object.
one of reason that I like passive more than glue is batter performance(if glue is not necessary). in 3dsMax do passive object is easy, so I hope can do same thing in H.

btw, Joker's hip gave me very much idea and I just thinking other way. may be I should delete the RBDpieces which has impact and born the same piece into fracture object dop. but I not finish yet.

Here is an example showing how to use the RBD keyframe active. It's equal to using the tic when the object is created.

thank you Ioness, cool idea!
OK, finally got the result what I want! it's still not a complete setting but can fix by hand. ( the problem is $PT is start from 0 but $OBJ is from 1, so I have +1 manually)
thanks guys. love you all!