$F to be a certain frame, Not 1

[Jamshid63]

Hi guys,

As i have pre-roll in my simulation, i am starting my sim from 1000th frame. but this is creating a problem, when i am using the "$F" , because i know it is recognising as frame 1.

so that is the help i am looking forward here. how do i fix that ?? i want this $F to be the 1000th frame not the usual first frame. 

if suppose, there is no solution for that , then all i want is...

"""i have 100 rigid pieces, and i want each frame to have different pieces staring from 1000.""". i type in piece$F in the blast node, and its starting from frame 1.

[Atom]

There is a companion global variable called "$SF". This is the simulation frame number, Try using that instead. All frame based expressions you use inside a simulation should use $SF, not $F.

 

Edited December 26, 2017 by Atom

[Noobini]

1 hour ago, Atom said:

There is a companion global variable called "$SF". This is the simulation frame number, Try using that instead. All frame based expressions you use inside a simulation should use $SF, not $F.

 

so if $F is 1,2,3.....

and my 'sim' substeps is say 10...does that mean $SF is 1.0, 1.1, 1.2....?

[Jesper Rahlff]

11 hours ago, Jamshid63 said:

"""i have 100 rigid pieces, and i want each frame to have different pieces staring from 1000.""". i type in piece$F in the blast node, and its starting from frame 1.

cant you do piece($F+999)?

[Jamshid63]

9 hours ago, Atom said:

There is a companion global variable called "$SF". This is the simulation frame number, Try using that instead. All frame based expressions you use inside a simulation should use $SF, not $F.

 

I tried both $SF method, and $F+999, still no good. 

 

7 hours ago, Jesper Rahlff said:

cant you do piece($F+999)?

Instead tried file caching the blasted node which starts from frame 1 and used time wrap node to start from 1000th frame. it works.

But i am sure, there must be an easy way. 

i have attached the .hip file , in case if you guys didnt understand what i am trying to say . 

framestart_problem.hipnc 

[Noobini]

here...so you see in my Blast...if I start at frame 100, I put in -99

in your case put in -999

So if you want the one piece to be NOT deleted and blast the rest..then of course simply put a ! infront, ie.

!@name==`piece+($F-999)`

(oh..of course, delete non-selected too....silly me)

deletePiece.hipnc

Edited December 27, 2017 by Noobini

[Noobini]

I modded your file, scrub from frame 1000 to see,

I'm not sure if your setup is right tho...you've got debris, then you've also got class...you might wanna tweak a bit....

EDIT: added a switch in so all is there up to 999, then it starts blasting...

 

framestart_problem_mod.hipnc

Edited December 27, 2017 by Noobini

[Jamshid63]

Thanks alot.