Welcome to od|forum

Register now to gain access to all of our features. Once registered and logged in, you will be able to contribute to this site by submitting your own content or replying to existing content. You'll be able to customize your profile, receive reputation points as a reward for submitting content, while also communicating with other members via your own private inbox, plus much more! This message will be removed once you have signed in.


Restarting a simulation from .sim files with Houdini 16

Hi There


I'm writing out a .sim file for every frame of my simulation and would like to restart the simulation from a given frame number but I don't seem to be able to do this.

I have the .sim file path and name entered as the initial state but if I press play or jump into the dop network and save to disk from the given frame number Houdini wants to start at frame 1 and re sim all the way thru.

Am I missing a step here?

As every frame is a .sim file I was assuming I wouldn't need to save checkpoint - am I wrong about this?


thanks in advance.




Share this post

Link to post
Share on other sites

I also facing the same problem..first I was surprised to see that sim files write from frame 1 while my start frame in DOP network is 100, but eventually it sets to 100 once we load from disk. (why it does that I don't know)

I even saved with check points but still it's not helping me to restart my cache from last cached frame.

Any help/info on this would be great.


Share this post

Link to post
Share on other sites

So you've set the initial state parameter on the dop network?

One other thing I noticed, is it appears you can't alter the hip file and be able to re use the sim files even if the change is not related in any way to the generation of the sim files.  I may be wrong about that but I couldn't get it to restart.

In my case, I had sim files for each frame and an initial state loaded but when I started the re sim it began at frame 1 again. In the end I gave up assuming rightly or wrongly that it was because I'd made a change to the hip file.

There is another post around describing the process someone else went thru to restart a sim in Houdini 16 but I can't for the life of me find it right now.

There are a few posts around to describe how to restart a sim but they refer to an explicit cache which I think is now replaced by checkpoints?

Sorry I can't be of more help and I hope I haven't confused the issue.

good luck..


Share this post

Link to post
Share on other sites

In the root of the auto dip network where you are reading your sim from, there should be something that reads start frame or begin sim or something along those lines. I've done it before. 

Share this post

Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now