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Found 10 results

  1. Post-Voronoi Boolean Problem

    I've stumbled across a rather annoying little issue. As you can see in the attached scene, If I perform a subtractive boolean operation after a voronoi fracture, things get super messed up. The two major issues being that a bunch of pieces are randomly missing faces and the new faces generated by the boolean are not connected to their respective pieces. I managed to get things working (albeit marginally slower) by utilizing a for each loop. Does anyone know what might be the cause of this issue? Has anyone run into it themselves? post_voronoi_boolean_problem.hipnc
  2. Creating subfracture group

    Good Evening, Im trying to improve the look of my fracture setup using booleans. The pieces look great but due to the boolean cutters the pieces dont read so well in DOPS. I decided to measure the chunks and shatter only the larger pieces in a bid to improve the collision geometry. I want to use a forEach loop for each large chunk, shatter it and then assign it to a group or assign an attribute so that I can use them later in the constraints network. Those chunks will have glue constraints set to -1 so they dont break basically meaning they are the same as the original piece but will read in DOPs better for collision geometry. I dont want the subfractured individual piece info just the original whole piece. Is there a way to create a group for each loop of the forEach. Then I would have groups like unbreakable_01, unbreakable_02? Would appreciate some pointers before I go insane haha hip attached. Thanks, Duncan forEachLoop.hiplc
  3. apply boolean twice problem

    hi, when I try to use a boolean node twice, second boolean result is always broken because I guess a connectivity issue. Houdini cannot understand the connectivity from first boolean result. I know some people says to cut together with many cutters, but I have a certain situation to cut separately. For instance first boolean produces 500 pieces, and keep 300 pieces and use second booleans for other 200 pieces, and so on. Some artist do after-1st-boolean > loop start > delete all pieces(groups) except one favorite piece > do-2nd-boolean > loopEnd > merge together. Or, I do translate and separate each other of pieces in order to make spaces between each pieces, then apply 2nd boolean, and it works I wonder if anyone knows smarter methods, instead of translating or looping booleanTwice.hipnc
  4. Hello. I have some problem with boolean SOP, when I Shatter model after Convert VDB to polygons, it just slices geo. Doesn't make separated pieces of geo. I tried to remesh and fuse geo before Shatter but it gives me nothing. boolean.hip
  5. Hi! Can't figure out how to assign attribute to different group parts that boolean made. I have a cylinder with some cylinders rotated and transformed like a tree branches. They intersect with main cylinder. After subtracting them from main cylinder "trunk", there are abseams edge group created. How to assign attribute for each loop(I mean all loops has one attribute but with different values for each loop - 1, 2, 3...etc)? Or how can i create separate group for each loop? This is for purpose to scale/transform them from center of loop in foreach, to affect them all at the same time.
  6. Hey guys, I want to make a simple screw in Houdini, but the boolean operator is not very helpful when I try to make the thread out of a helix :/ The aim is to subtract the helix from the body of my screw, which should create my thread. But it won't subtract it entirely :/ Could you help me please? screw.hipnc
  7. Good evening I am trying, to boolean a very complex model inside houdini. Its an engine that has thousands of little parts. Since the original format is not supported, I had to use Softimage first and than export the geometry. The first problem of course is alot of open caps, dissconnected edges etc. Actually most of models we get from architecture/ingeneur applications, give us alot of headache Anyway, I thought first thing to use would be a 'remesh'. Takes some time, but thats working. Problem is, the geometry will be smoothed out and so on. And when using 'cookie' houdini is crashing. What about using VDB? I tried that. Super fast and actually a nice result. But when I combine the engine with a cube to cut out a cross-section and 'convert to vdb' to get a polygon model, the model has alot of holes, disconnects etc. Is there a recommended workflow? I exported the model from Softimage as Alembic btw. Thanks alot, marc0s
  8. Hi. I'm working on a tool that allows to selection-paint fracture pieces. It works great on simple things, like spheres, planes or tori, but ... when it gets to a more complex, organic shape, like a human face, and the model has holes, things start getting hairy. The weak link is the Break SOP. Right now it seems to me it's almost unusable on anything complex. The only thing I can think of to fix it right now, is to convert the model to a flat set of patches based on UV's, do the cutting and then wrap it back to its original shape, or replace the Break SOP with something else. Any advice? Best Regards Filip
  9. Hi, I want to get the frame number in which an attribute changes its value, and keep it stored. Maybe my brain ain´t at its best today, but I´m struggling. Currently taking a look at CHOPs triggers... Any quick solutions out there?
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