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art3mis

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art3mis last won the day on October 7 2018

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About art3mis

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    Houdini Master

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    vimeo.com/bachalo

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  • Name
    Jim
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    here, there
  • Interests
    film making, cinematography, unity 3d, motion graphics, VR
  1. SDF's, are they all equal?

    Thanks Henry. So not the same.
  2. One thing that seems to be glossed over in many tutorials is the relationship between native, non-native VDB volumes and SDFs. So an SDF can be created both ways, using native volumes via ISO Offset and aslo via VDB's using VDB from polygon. But can anyone tell me what the difference is between these 2 SDFs? ( created using ISOOffset and a SDF created using VDBfromPolygons)
  3. Vellum cloth - removing stretch

    As mentioned Increase Substeps and also Contraint iterations. The defaults are WAY too low. Stiffness has no effect on the 'stretchiness'
  4. Neon Dancer

    Still wresting with attribute collisions in layered materials but finding Vellum lots of fun!
  5. Ended up doing 2 separate solves and merging AFTER the simulation. Not ideal but in my case I can get away with it because my Layer0 clothing hugs the surface of my collision geo and doesn't really interact with the Layer1 clothing.
  6. Darn. Yeah tried throwing the wrangle inside the Solver but made no difference.
  7. Thanks. However I believe there is still the issue of the 'Self Collisions' toggle on the actual Vellum Solver overriding anything defined in a wrangle further upstream. Guessing this requires 'hacking' the actual Solver?
  8. Hi Have a Vellum network with 2 pieces of geometry draped separately, then merged and input to a single Vellum Solver. The problem is that I want ‘Self Collision’ to be only enabled on 1 of these merged geos. How would I accomplish this?
  9. Interrupted Simulations

    Thanks guys! Need to revisit the documentation on the difference between .bgeo and .sim files. The VellumIO SOP doesn't seem to have CheckPoint options. Will look at changing my workflow, perhaps with Cache SOP or... No I usually never change the Start Frame on the actual Solver node.
  10. I often find myself interrupting a long simulation just to ensure everything is working as it should. But then when I try and finish the simulation by specifying the frames where I left off, I often find that I am recooking the same frames, starting at frame zero. For instance I interrupt the simulation at frame 100, then in the Cache or Vellum IO SOP specify the start frame as 101 and end frame as the last frame in my sequence. Then a Save to Disk shows that I am recooking frames 1 thru 100 instead of starting at frame 101 as specified. Why, and how do I prevent this from happening?
  11. Does anyone know if there is a way to either modify the existing ffmpeg mp4 video output or add additional codecs? The problem with the default mp4 output is that the resulting video doesn't allow frame br frame scrubbing which makes it somewhat useless for testing IMHO.
  12. Redefining vellum properties on specific frame

    Thanks. Appreciated
  13. Getting a strange Vellum Weld seam issue. The connections between 2 weld seams are criss crossing. The number of points match on both seams and I also tried changing the Cycle value on each seam. Anyone know how I might resolve?
  14. Redefining vellum properties on specific frame

    Thanks. Beginning to think i should be doing Vellum entirely in DOPs moving forward...
  15. Hi Using a Paint SOP to redefine Vellum collision properties on part of my collision mesh but I need this to happen only after a specific frame in my sim. Should I be doing this via vex in a Point Wrangle or...?
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