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  1. Hello, I have a cloth simulation to stabilize and I use CHOP to smooth the Position in time of the center of the bounding box of my simulation. The simulation is quite heavy so I used a file cache to avoid several calculation of the sim. But when any file cache is used in the source of a CHOP network I have an invalid source SOP error. As I am trying to smooth only one point Position I tried to copy another point on it and then send the resulting point position to CHOPS, but the same error happens. Is it a limitation of the CHOP paradigm ? many thanx.
  2. SOP substep ?

    Thx, but it doesn't change anything to the cooking rate I guess.
  3. SOP substep ?

    Hello, thanx but that would just redistribute the emission positions right ? I would need to get the rotation information at a larger rate instead. thx a lot.
  4. SOP substep ?

    Hello, I am emitting particles from one moving point. I added rotation to this point in order to emit from its orientation. I can just made it turn with a simple $F expression for example. But I am emitting from this point (at a pretty high substep) particles following the orientation I gave to the point before. It gives me some king of trapcode particular auxiliary emission, it works fine but the popnet gets the rotation from the point it emit from once by frame (cooking time) and I need something like 50 cook by frame to get a nice smooth rotation. How can I make Houdini cook more than once by frame on a simple point animation ? I tried the timeblend sop but I am not sure how to set it. To be clear I would need the same 'substepping' effect I get when I make particles spin with a popspin with a 50 substep setting. thanx a lot.
  5. Best approach for cloth ?

    So far I am getting this with the volume curl noise of a fluid source SOP : I miss some of the very specific little wrinkles from the silk. thnx a lot.
  6. Best approach for cloth ?

    Hello, I am also trying to achieve this kind of cloth effect : a simple cloth square of silk, going from flat shape to this kind of distortion, without any attachment. I tried with wind force and fan force but as said before, maybe the model isn't really suited for FEM solver. I tried to import some vector volume and log it into the drag tab of the cloth, it works nicely but I can't configure a volume field that gives that sort of pretty sharp folds. Any thought on this ? Is there any volume noise that would produce this kind of distortions ? Thank you for your help. Jerome
  7. NURBS point order

    I will try this thanx a lot.
  8. Hello, I am trying to morph between two nurbs surface generated by a polypatch. It works quite well until I try some specific output divisions because the two different polypatch give me a very different point distribution (the point number is the same on both polypatch nurbs of course). I tried to sort them but nothing seems to solve the problem, the difference in distribution can't be just compensated with some shifting or reversing the order. So is there a way to force one nurbs point order to conform to another ? The shape isn't similar enough to use "proximity to point" or "from Z" options of course. Many thanx.
  9. bend falloff

    oops never answered this, thank you guys.
  10. Very Nice Martjin, thanx a lot, But the time information comes only from the hit time attribute generated by the pop collision, cleverly transferred to stamp or any other way of applying it. I wish I could 'get' the time info of any point appearance, not just particles. I guess I can't avoid Chops… Many thanx anyway, nice file.
  11. thx a lot Martijin, I'll check it out.
  12. thx a lot Dominik and Martjin, So is there a vex function that returns the 'point existing' information ? Martin the expression in the delete is just something like @Cd.b < 0.1, is there anything returning the time of a delete action ? I just need the points birth frame to trigger some other stuff. Sorry if it is a bit confused. Many thanx. J
  13. Hello, I am making points appear in a scene with an inverted delete (based on color) and I would like to store this appearance time. Is there any way of doing this ? I guess I could use some kind of trigger in CHOP but I don't know where to 'send' it from chops in order to create a new attribute. I tried in vop with age but I guess it is related to particles age attribute only, not to simple sop deleting action. Many thanx. J
  14. Attach cloth sim to wire sim

    Hi, In case someone is looking for this, it is quite simple, you just have to import the wire into the cloth dopnet even if you don't need any collision relationship. The constraint needs it inside the dop in order to refer to it. the point selection though can be just a group in sop. SBD constraint et SBD pin constraint are working fine, not in soft constraint mode though. SBD spring and all king of soft constraint doesn't seem to work, even with a huge strength, the constraint are not resisting to any force. Thx to Olivier Jeannel for this explanation.
  15. Hello, I tried pretty much all constraint configurations in order to attach a cloth to a wire sim without success. Nice guys from the Houdini slack have advised me to simulate the wire then attach the cloth afterwards, but I can't find any constraint that "read" the wire points anyway. What would be the constraint nodes I need ? Should I absolutely transform the wire to polywire to get proper polygons ? To be clear I am just trying to attach a flag to a thin rope and get some realistic wind movements on both. Many thanx.