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Found 10 results

  1. Hi All! I'm wondering if anyone has run into this and found a good solution, it's been popping up in my low-to-mid viscosity sims for a while. Perhaps I'm missing something stupidly obvious? Collision geo/field are fine and the interface between fluid and collision object looks great before turning on viscosity, then I get these grid artifacts that are tough to get rid of. Reducing Surface Extrapolation way down in Volume Collisions helps but doesn't completely remove the artifacts. Also, using a high slip-on-collision value helps, but I usually don't want the sliding behavior with sticky viscous fluids. Reducing Grid Scale reduces the relative grid size and helps too, but the artifacts are still there, just smaller. Attached file is somewhat of a worst-cast example, just curious if other folks have dealt with this before. I know I can run some post-sim tweaks to clean up the collision surface intersection, but I've also noticed that the artifacts reveal themselves on the outer surface of the fluid if it gets thin enough, which is not so easy to fix... 01 - viscosity disabled 02 - viscosity enabled 03 - viscosity enabled, surface extrapolation 0.01 Thanks in advance for any help/ideas!! --Dave DStewart_FLIP_ViscousCollisionStepping.hip
  2. Hi Houdini hive-mind new here (sort of) looking for some advice on how I might be able to create a grid where the cells are arranged in an opus pattern. I have a cell of a minimum dimension (lets say 200x200), I want to be able to have the other cells multiple dimension of that in x and y. (400x800, 600x400 or even 200x2000 for example). Crucially there are no L shaped/tetris type arrangments. Im fairly sure it involves making a grid of cells with the minimum size, and making random selections to delete and build bigger patches, but not sure the best way to go about it without creating odd shapes. I've reached my intelligence limit, and I defer to clever folk here for any kind suggestions (or of course, solutions posted elsewhere) Thanks
  3. Hey magicians, I've been trying to do some pattern stuff inspired by Ehsan Parizi, but I can't get my head on how to do it. Here are some Ehsan examples And this is what I did so far lol I know this is probably not the best way, im stuck to rotate them in certain axis like he did, any tips on how to create this different types of patterns will be really helpful. Attached is my file. Thanks! gridtest.hip
  4. Hi guys, How do I make a knife always be perpendicular to grid it is cutting?
  5. Hi all, I'm trying to make a glyph generator based on a 3x3 crossed grid. This is where I have got to so far. The way I've created this is pretty rough. I made a grid, divided it, flipped it, merged the results, fused, converted to wireframe, assigned random colour for primitives, delete by colour, stamped with copySOP. Instead of converting the edges to a primitive, i would prefer to assign a random attribute to the edges and delete them on that basis. But my knowledge has hit a wall as edges aren't really attributable according to the geospreadsheet. Further, I need to figure out a way to identify when a 'X' happens and delete one of the edges. Maybe I could fix this further up the tree by stamping a grid which randomly flips a divided cell (rather than flipping the whole grid and merging+fusing them). If anyone has any pointers let me know, I will also attach the hip too. Hope I make sense! Cheers. glyph.hip
  6. Hi, How do I change the subdivisions on the grid in houdini? The option is greyed out. Thanks in Advance
  7. Hi All, I've set up my C-plane to display lines every 1 unit and major lines every 5 units (screenshot CP1). It works perfectly in persp but in the other views (top, front, etc.) the display is back to lines every 0.5 unit and major lines every 4 units (screenshot CP2). What did I missed? Thanks
  8. Hi, guys. I get a problem maybe it was be asked before, but i can't find any tips. There is a grid polygon and i add a line on it by add SOP. Is it any way split the grid to two part by the line even the vertex number was not right. I can split it by polySplit or Clip, Break SOP, but they were not flexible enough. Any help will be appreciated! Thanks. grid_split.hip
  9. Hi, I want to know if it's possible to have an object attribute outputted as file or in a ROP Net node. I have a 1024x1024 grid right now. Each point on the grid represent a pixel. This grid has many attribute and I would love to render a map of all these attribute. I know and tested to copy each attribute to the Cd attrib and render it. It works but I wonder if there is a simpler way. A node for instance that would not need a camera or would not need to copy the attribute to render to the Cd attrib. Ideally I would like to have a render node that renders the top view of an object given attribute. Thx! C
  10. Good day, I'm looking for a simple way to convert a line or a curve in a curve composed only with right angle edges. I have try to use Fuse SOP in Snap/Grid mode but this gave me 45 degrees angle too. Any idea?