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About bobbybob

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  1. Thanks for the answer @konstantin magnus, but what I really wanna know is, why we can't delete the @P attribute. Just to understand the data architecture better.
  2. I ran in to this problem, because I have a sphere, and I need a deformed version of it, but only as a rest attribute. I know how to do this in other ways, but I thought, that to just make the deformation, create the rest, delete the P attribute and then merge it with the original sphere would be nice. But when trying to delete the P attribute with a Attribute Delete, nothing happens? Is this because P is a special attribute or something? Would be interesting to know.
  3. I am trying to separate geo that intersect. I am trying to do this with simulation. I am able to do this via the wire solver (File example) but I need to be able to separate more custom geo then just "tubes". What I want, is to first separate the geometry (custom geo), then take that geometry and use it with the FEM solver. I am not able to make the FEM or Grain solver push geo away from each other, when it intersects like I can with the wire solver. Is there any trick or something that I have overseen? I am able to push away points from each other via vex, but it is pretty slow, because it has to iterate over a lot of points, and run more then ones because some geo that is pushed, will intersect with other geometry, and it is not that easy to setup if I don't start with lines, but real geometry, (like geo from zbrush) wire_separation.hipnc
  4. When would you use FEM over Grain

    @StepbyStepVFX, thanks for your answer. So this is actually described in the FEM docs, I feel a bit stupid Quote from documentation
  5. When would you use FEM over Grain? The last couple of weeks I have been working with Grains, and got a good understanding of how it works. It seems that you can do pretty much everything with this tool in case of cloth and simulation of object that will deform. I haven't been using that much time on FEM, and from my perspective it looks like a tool that has a lot of overlaps with the grain tool. It could be nice to get an understanding of where the FEM and Grain tool differs and where to use which, from people that has good experience with both tools.
  6. Control "surface stiffness" of granular sheet

    In this hip, there's a cloth simulation that does what I am trying to explain. The other network is a grain solver, where I am trying to create the same "surface stiffness" by using the targetP, but I don't think that is the right way. surface stiffness.hipnc
  7. Is it possible to control the "surface stiffness" of a granular sheet, so it will act like a sheet of paper or another stiff material?
  8. Thanks. What I wanted was to create a velocity field only in the object. I ended up using 3 volumes for the velocity and one more as a density volume that I am using as amplitude for the noise, to keep the noise in the shape itself. Maybe it would be a bit faster to copy the volume and rename it as you mentioned @TheDude, Thanks for your answar. Example image:
  9. How is it possible to convert a single volume, to 3 volumes (velocity) I have shaped form that I am converting to a volume. I then need to convert that volume to vel.x vel.y and vel.z, to create a velocity field of. it is not optimal to just create a bound and then convert it via a "Volume" node, because I need to keep the original shape.
  10. I am trying to create a solid object, with hair simulation that can collide with other surfaces. Right now I am using the "Organic mass" shelf tool, to create a solid object of a sphere. I am then applying hair (Add fur) and then adding hair simulation (Also via the shelf tool) I have also added a ground plane. When the solid object collides with the ground plane (And the object begins to deform), the hair simulation explodes. Is there another way to create a solid object with hair simulation, that will work, when colliding with other objects?
  11. @vicvvsh thank you! That makes sense
  12. Is it possible to use at point group from sop level, to constraint points in a dop (wire sim) with the "SBD Pin Constraint", instead of manually typing in all the points, that has to be "Constrained Points"?
  13. So often I create some different file cache nodes, from my "dop output". When simulating I often need to see how the sim is acting after 50 frames. But I can't resume the simulation, from frame 50 and to the end. I can imagine that, it's because the simulation, don't know the previous frame and therefore don't know how to calculate the next. Is there a fix/tip to get this working, like giving the solver the prev frame, to continue the calculations?
  14. How much memory do you use?

    I am putting a new computer together. I am in doubt of how much memory I am going to use. My current configuration is 2x GTX 1080ti and 64GB of ram. I am rendering all my stuff in Octane, and can therefore benefit of the two 1080ti's. But I don't know if 64GB ram is enough. Are you guys, and girls often experiencing that your simulations is maxing out at least 64GB ram, when simulating stuff? The alternative, would be 128GB ram and only one 1080ti. (64GB ram cost about the same as a 1080ti)
  15. I am about to buy some new hardware for a workstation that primarily are going to be used for working in Houdini. I am thinking of putting a Ryzen Threadripper 1950x in it, for the high amount of cores, and the relative low price in relation to some other Xeon CPU's. All my rendering is done in Octane, and the CPU will primarily be used for simulations. Are the 1950x, the right choice, for Houdini work?. For what I know, does Houdini support multithreading in almost every aspect, but does the high core count make up for a lower core speed. The alternative is a I9-7900X, where the cores are faster, but the number of cores are lower. Are there any other CPU alternatives in the price range (or a bit more expensive) that would give better performance?