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Found 120 results

  1. while pointvop only run over points, is it possible for the point to find out what's the prim number belongs to, and then retrieve a attribute from the prim? i am currently making: 1) attributes in a curve 2) promoting the attributes to points 3) using those attributes, but now i have 3 loops over the geometry =( and i would like to optimize since will be a lot of curves/points, i would like to vopsop loop the point, find what's the Prim number that belongs to and retrieve the attribute from that prim. thanks guys optimize_vopsop.hip
  2. I’m looking for a way to go about connecting points based on a min/max distance. My goal is to skip connecting the points closest to the starting point, and only connect to points within the minimum distance threshold.
  3. Hello guys, As you can see in the image below, in a bunch of points islands, I need these things, using VEX: 1) I want to apply random color to each point island (cluster). 2) I want to group each cluster’s (averaged) center points. I tried several ways without success . I would appreciate any ideas. Thanks for helping. Center_Of_Point_Clusters.hip
  4. Hi, I'm trying to offset points along a curve with a specific p vector... I'm pretty close but it seems to be shifting the point count randomly when it animates? You can see where the problem is in the screengrab.... Here is a test scene any advice or help would be much appreciated. pointsTest03.hiplc
  5. How to shape the points following a curve

    Hi everyone, I have some points that follow a curve and I want to control the shape of the tip of this stream of points. I want it to be like the tip of an arrow, so the points at the tip converge toward the center (so towards the curve). I guess I should use the @curveu attribute and a ramp, but I'm not sure.
  6. Hello, I'm trying to wrap my head around this... how could I have the orient of nearby points (possibly with a falloff) point avoid (point away from) a nearby object? My setup right now consists of copied points on a surface and would love them to directional rotate away from the sphere as it gets close to them... here is a scene file if anyone wants to take a stab! pointAway01.hiplc
  7. Connect opposite points in vex

    Hey hey. I'm trying to do a very simple thing - connect opposite points within vex... Normalas are given. I've tried with dot product but failed((( Any advices?
  8. Hello, I am trying to reduce the curves of a groom object using VEX code in a point wrangle. This is the code I am currently using which is run over 'roots' to locate the nearest other root points and then to reduce curves that those points are in. float searchRadius = ch('searchRadius'); int nearpnts[] = nearpoints(0, @P, searchRadius); foreach (int pnt; nearpnts){ if(pnt < @ptnum){ int primcon[] = pointprims(0,pnt); removeprim(0,primcon[0],1); } } This way does reduce the number of curves but it doesn't do it in a uniform fashion. Is there a way to uniformly find the densest points within a threshold so that the curve can be deleted? Thanks.
  9. Flickering Liquid

    Hi there! I have this melting setup with a POP solver, basically scattering some points onto the original mesh and then melting then and meshing back everything again using "particlefluidsurface". So I have been trying to get rid of this flickering on the mesh, I have over 500k points and I also tried increasing the samples and playing with the particle separation in the "particlefluidsurface" I also tried using "vdbfromparticles" but its more or less the same result. I want to know if there is anything I can do to help reduce the flickering? Any help on this is much appreciated Thanks in advance untitled10.mp4
  10. Hello, I have a sim set up using flip objects with geo copied to points. I want to be able to delete 5% of my points every frame after a specific frame, so there is a gradual deletion. I referenced this post which triggers from frame 1. https://forums.odforce.net/topic/29024-delete-5-of-points-every-frame/ Can I achieve that same setup, but trigger it from a specific frame number, rather than from frame 1? I'm a beginner and still getting my head around vex. Any help is appreciated. Thanks.
  11. Hello, I am scattering points onto a grid and I am using a noise to displace it, but I only want to move the points vertically. How would I achieve that?
  12. Hello, I have a sphere where I am scattering points in the middle of each primitive, but the final output has the made all the cubes face in one direction. this is the desired outcome I want, but all the points here are scattered on each point but not on each primitive. Any help?
  13. Emit pyro outwards (not upwards)

    Hey everyone, I have an animated object moving in a sin wave type motion. I am trying to emit smoke outwards from it. At the moment the smoke is just rising in Y which isn't what I want. Any suggestions? + i made an awful unnecessary diagram, it might help or it might be confuse matters
  14. Displace points along normal in VEX

    Hello everyone ! I want some points to be displaced along their N, for various reasons it needs to be in VEX. But some points doesn't react as they should. I tried the same workflow in VOP and it works perfectly (but once again, I need to do it in VEX ^^"). Do you have any idea where there can be a problem ? (I put the hipfile for a better understanding !) Disp along normal VEX.hipnc
  15. Hello everyone! I recently made a setup to achieve magical smoke effect that orbits while moving. I shaped and animated a bunch of points that move along a custom curve. I want to make all those points orbit or twist around the original path (curve), something similar to curve force node for POP. I'm having some difficulties making this happen with VEX. I would appreciate your help. Cheers; Basic Shape.hip
  16. Hi folks, Maybe u can tell me how this color effect is achieved? You can see it very good on the blue one blop. There are random colors distributed along the y axis, also a different combination on every spawned blop. https://www.instagram.com/p/BrshgtPHbyk/ Any Ideas? Have a nice sunday, and thank you in advance!
  17. I'm going through a tutorial on the Microsoft website entitled 'Use SideFX Houdini to turn point clouds into optimized 3D models for Dynamics 365 mixed-reality applications' and have run into a problem. I've converted a LAS point cloud, taken from Open Topography, into a point format using Recap Pro. I've then converted this point file to a Houdini format .ply as per the tutorial. No errors, but I seem to get only a few points in a bounding box. How do I visualise the actual points? This is my first day on Houdini Indie, so it could be something very obvious. Thanks in advance.
  18. Hi, can someone please explain to me, why we would set the run over parameter in a wrangle node to detail or points? What is the difference between these two? I know that run over points means that the vex code is run over each point in parallel, but what exactly is run over details? Thank you
  19. Hi guys, I'm a little lost on how to calculate distance between successive points (picture) of my floor mesh. I guess i have to use a "for each point" in Vex. This distance will help me to creat wall with the exact scale between angles. Thank you for your help.
  20. Hit data in SOPs

    Hi, As the title says, I'm trying to make hit data in sops. To expand on that I have a sequence of points moving through a piece of geometry and I would like to create a point that lasts for one frame at the point of intersection on the geometry. Is this possible? I have a rough setup that uses nearestpoint and fuse, but the points I am getting are not accurate enough for what I am trying to accomplish. Mostly because the moving points are very fast and all have random speed. Any help would be greatly appreciated. Thanks in advance.
  21. Hi ! I'm currently working on a vellum grain simulation for snow. I need to export it to Maya for the rendering process! (our light rig and texturing is made on Maya) So my idea was to separate my meshing in two parts: • one will be particles that moved at least one time (the real "grains") aka a dense meshing to get grains almost individually • the other will be the particles that did not move/are less important aka lighter meshing to get the shape of the grains. in these way, for big scenes, I'll have a two alembic low & high, instead of one very heavy alembic file. Problem is : I can't seems to find a way to separate the two of them. I saved my simulation (cache) with P and V , and wanted to create a group that'll update at every frames to put the new points that moved in it. Unfortunately: Houdini is overreding the group, like it's creating a new one for every frame. Any idea what I can do ? Thank you so much, Marine PS : On the file I attached, the idea is to get everything around the foot shape in red
  22. Hey everyone, does anyone know how to split the lines up into different colours being animated with shortest path and a carve node? This is what i've got so far, but the different colors aren't following lines
  23. Point Group From Texture

    I am trying to do a vellum simulation and was wondering if its possible to select points and group them based off a texture map. What I would like to do is build a UV for the model I am using and then just use a black and white map maybe to select points based off the map. My issue is that I am Remeshing my object on import and have to keep adjusting the remesh to get the right amount of points for my simulation. However the shape never changes so if I could use a texture map to select the points I need every time I remesh it would save me from having to re-select them. Hopefully this makes sense.
  24. Hi everyone, I'm trying to do something quite simple but i'm struggling with it. I have an imported pile of sticks, i want to take this pile and copy each stick to a different point on a grid, i know how to do this using the method of having each stick have its own geo node and pluging those into a switch and copy stamping them onto a grid, but i want to achieve this result without having each stick be its own node, as there are 214 individuals this would make for a very crowded network. Could anybody help me out? I have attatched my current set up, I am guessing I need to specify in the copy stamp that for each point it needs to select one of the 214 points which are being fed into it, but i'm not sure how to command this expression? Thanks in advance! Dbrs_wood_twig_T_rfkkwaa_LOD0.obj
  25. Flip Source From Points

    Hi everyone I was playing with the flip source node and I am wonderig : is there a way to create a flip source from points, instead of from geometry ? For exemple now I want to create a flip collider from a point simulation, if I want to use the cool flip source node I have to create a vdb from particles + convert vdb to mesh + flip source, I guess there would be a more efficient way ? Have a good day, thank you for your time
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