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About chaindriver

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  1. Make particles follow lines or grids

    Thanks for the tips Gui! I'm trying them out now!
  2. Hi, I'm trying to get particles to move along lines and grids. Is there any particular way this can be done?
  3. Water inside of air field

    This is excellent Sergey! Great comparison. May I know how is this air field created? Is it some standard node/OTL that can be plugged into my DOP network?
  4. calculate velocity based on id

    Very elegant solution, Tomas. Thanks so much for the hip file, it helped me a lot!
  5. Hi, I'm trying to create the v attribute for my points using a Trail SOP. The problem is that the points are deleted and generated, so the point numbers are not the same, and the Trail SOP seems to be using the point numbers. Is there a Trail SOP that matches based on id? I do have an id attribute per point though. I'm currently using foreach and timeshift SOPs to match points in the previous frame using id, and then calculating the velocity from the positions. This is however very slow. Does anyone have any better ideas?
  6. ROP dependencies

    I see. Not a big issue, what you have mentioned is sufficient for now. Thanks for the replies!
  7. ROP dependencies

    Thanks so much for the awesome detailed reply Mark! I've tried it out and it works like how you have mentioned. One small question left though: Using your method, is it possible to get cache1 and cache2 to run frame by frame? Right now they have to run node by node because of the batch node below, it seems.
  8. ROP dependencies

    Hi, I'm trying to figure out ROP dependencies. Say I have two geometry caches that I need to cache frame by frame. After this is done for the whole frame range, I would like to cache two other geometry caches frame by frame. How should I link up the ROP network to do this?
  9. Just tried the icmax (and icmin) expression and it works like a charm. Thanks guys!
  10. Hi, I have a parameter in the OBJ level that is animated. How do I get the min/max value of that curve? Is it by an expression or maybe CHOPs?
  11. cache only the last frame of a sim

    Thanks for the help Tom. Used it in my network and it works! Initially I thought it wouldn't work because switching to the null branch would mean that the main sim branch is not evaluated, but looks like I was wrong.
  12. cache only the last frame of a sim

    Hi Tom, thanks for the reply. Forgot to mention that I'm doing the sim in SOP (via Feedback SOP or the new H12 Solver SOP). The activation parameter seems to be available only for the File DOP, but not the File SOP...
  13. Hi, I have a sim that I need to run from $RFSTART to $RFEND but I only want to cache the last frame out to disk. I'm using a Geometry ROP but there's no "on/off" switch for me to determine which frames it should write to disk via expression. Does anyone know how I should go about doing this?
  14. Capping holes

    Thanks for hip file Spencer. Some handy tricks there!