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Found 135 results

  1. Ripple solver issue

    Hello ppl. I'm trying to figure out an issue with my simple ripple solver setup. The grid over which i'm triggering ripples, seem to moving down the Y direction slowly throughout the simulation. What am i missing? Attached the scene. Thanks! Ripples.hipnc
  2. Hello all! I have been trying to figure out how to dynamically update the constraints in a vellum constraints property node based off of the distance of the vellum object from a given point in space, but I cant figure out how to make this calculation dynamically in this context. I can measure the distance before and after the vellum solver with a distance node but they only give me static values in the solver context so I dont know how far things are once theyve moved. Havent been able to get xyzdist to work either. Any help would be greatly appreciated as this project is very important to me!!
  3. Hi guys' I would like to transfer some attributes from a fixed object to an animated one, using the Solver node but it seems that the Solver node doesn't accept animated geometries on its input, right? How can I fix it? Thanks for helping. AttributeTransfer_01.hip
  4. Rotation in Wirecaptures

    Hi, the wire capture and wire deform are not taking the rotation of the points to rotate the geometry, attaching the sample scene file below, Basically, I'm rotating the curve and deforming the geometry using wire capture and deformer but it's just moving leaving the rotation Thank You wirecapture rotation.hip
  5. Help in understanding Solver

    Hi everyone I'm kinda new to houdini and I've recently started playing with the Solver SOP, but I don't really understand how the geometry is processed inside the solver. Essentially if I try to move some points through a solver, what I see inside of it is a static mesh that moves its points but that doesn't really shifts (as if on every frame the points are set to 0 and then moved again) but if I look at the Geometry (one step above) viewport everything works as it should. Can also anyone help understand "dop import" node and how it works in the solver. Any help is appreciated. test_solver.hipnc
  6. Pyro and RBD interaction

    Hello, this may be very simple question, but I have struggled to find anything about the topic on my own. I am wondering how would you get pyro interact mutually with RBD packed simulation. Or what is the workflow for let's say explosion from the side of the building, when I want the explosion to be the force by which the building is being broken. I'd be super glad for any pointers or help. Thanks, Clear
  7. Hi, Is this the way to add a SOP Solver in the new RBD Bullet Solver SOP? I noticed that we have access to a lot of nodes inside it. It says "wire pop forces into here" but not sure how to hook up a SOP Solver. I'd like to set up some custom activation inside this RBD Bullet Solver SOP.
  8. Hey guys. am recently decide to use houdini as a 3D package and i have an issue in a rigid body simulation. The problem is: i have a chain ring that should drop on the floor and after dropping all ring chains should interact with each other. at this moment when i drop chain ring, all chain parts just dropSide Effects Houdini 2021.02.26 - 00.18.55.01.mp4Side Effects Houdini 2021.02.26 - 00.18.55.01.mp4Side Effects Houdini 2021.02.26 - 00.18.55.01.mp4Side Effects Houdini 2021.02.26 - 00.18.55.01.mp4 and don't interact with each other, they interact only with floor is that possible to make all chain parts collision object? Side_Effects_Houdini_2021_02.26_-_00_22.09_02.mp4
  9. Vellum Pressure

    Hi, I wanted to ask about some of the hidden intricacies of vellum pressure. In particular I recently found out about the @pressuregradient attribute that determines the direction in which the object expands as pressure is applied. I wonder: How is it determined? I suspect something to do with Normals, but then when I visualise the attribute it tends to always have a rough relationship with {0,0,0} - why? This leads to strange inflation especially if an object is off-center and then it trends away from the origin, as opposed to away from its center of mass... Can it be manipulated in the solver? It would be nice to procedurally predetermine the inflate direction, although I'm not sure how to access or manipulate this attribute. Can it be manipulated per frame? If I have multiple objects that start in a rest position and their inflations happen one after another - one ball moves other balls out of rest position for example... Then once the ball that has already been moved starts to inflate, is it computing on the pressure attribute given at the start of the solve, or the one at it's current frame number? I could probably word these questions better and I do apologise, but at the moment it seems I have run out of places/videos to read/listen to. Thanks a lot for your help! Cheers.
  10. Hello, I want to delete alembic cubes when collide box. But using solver to write attributes, The alembic couldn't move.. (I know the reason that is read looping for the first frame..) Anything way to avoid this? Thank you ToOdforce.7z
  11. Hello. I'm struggling with changing vector direction inside a solver. In the file attached there is a point that reads vector attribute of a nearpoint and uses it in order keep on moving. The movement is done in solver. The problem is that it can after doing a "step" the point can take a new vector that is opposite to it's current direction and "step back". It returns to previous position where it gets a former "go ahead" vector and does a "step forward" and repeats the whole vector change and "back and forth" movement on and on. Inside the solver I try to compare vectors of previous and current frame and build a condition - if they are opposite let the point go down {0,1,0}; But no matter how I try it doesn't work. If someone can help me... SOLVER_problem.hipnc
  12. Few nodes won't work on OpenCL

    Hello, I am trying to work with OpenCL but as soon I enable them on few nodes, like the gas disturb, gas turbulence, it stops working. I just get a mushroom smoke effect. Does openCL not work on these fields? I have attached some screenshots. The first image is without OpenCL, the second one is with smoke disturb disabled and the third image is with openCL enabled on Smoke disturb.
  13. updating vellum constraints dynamically

    Hey all! I was hoping to get some help figuring out a way to update the stiffness value of a vellum constraint geometry across the frames of its simulation. I can write an attribute wrangle like the one pictured and it will update the starting frame and the simulation bakes from there and plays as though the values werent changing at all, much less becoming negative. I tried dropping into the vellum solver and seeing if I could figure out anything in there but nothing seemed to work. Im still pretty new to houdini so I expect it to take some time but I was hoping to eventually take whats done in these two awesome videos and merge them into a project where a genetic algorithm produces tensegrities that update their stiffness over simulated time in order to deform in ways that cause them to (hopefully) roll towards a target. Hip file of the simplest version of the problem is attached in case it helps! Thanks for reading!!! VellumConstraintsHelp.hipnc
  14. POP particle collision/final resting

    OK... I think I've exhausted my button pushes and research. If anyone can give any pointers about getting my collisions/debris to actually appear to rest on the surface and/or interact with the moving model I would be very thankful. Currently, the `debris` appears to come to a final rest above the surface. I've included the scene and ref'd geo. quinniusMaximus_recog.zip
  15. Hello, I am following a tutorial on DOP Networks and Rigid bodies but when I apply a quickshade outside of the dop network and try to Import it as an RBD Object, it doesn't bring in the texture. I am not sure what is wrong? Can you please help? Please find attached the scene file. Thanks. TextureProblem.hipnc
  16. Pre-solve Post-solve

    what are exactly the pre-solve and post-solve input of popsolver ? there isn't any explanation about these input in the documentation?
  17. Hi all, i've got some points with trails and i'm filtering them randomly to leave some behind as the trails move forwards. each trail is split into a leading point and the trailing points, and each trail and its leader have a unique id. what I want to do is take the points i've left behind and remove them if they come into contact with another point trail that has a different id. so something like an attribute transfer but with a condition that checks the near points id and only transfers some attribute if that id is different. so the white points from trail 1 would exist until the come in contact with the red points from trail 2. Any ideas how to do this in vex or vops? Many thanks,
  18. I want to save the frame where the point joined to a group. I try this method: Its work perfectly, but my geometry have animation so i try to combine with this method: https://www.sidefx.com/forum/topic/21416/ But its just drop to zero my attribute after its get in the group.
  19. Hi ! I am making a project of a bridge destruction and i have a problem that i can not get solved I need to get my rbd to inherit a speed and initial rotation, when they enter the active state. I want to achieve something similar to this https://www.tokeru.com/cgwiki/index.php?title=File:Staggered_fracture.hipnc . but in the sop level and not in the dop. Best regards
  20. Hi guys, I have a rigid body sim with constraint network, I want to access the previous frame and current frame data of the constraints (impact, forces etc) inside a sop solver in DOPs. Currently when I call the attribute in a wrangle from the relationship geometry node I don't know if it's current frame data or previous frame. How to get both the current and previous frame data in a wrangle in sop solver in dops?
  21. Hello! How to Increase Particle Separation for Spray - Setup whitewater solver?
  22. Hey guys! Ive recently been trying to code a basic path finder, for pipes on a building. I have tried writing it in a vex for loop, without much success. Did i just code it wrong, or is this even possible without using the solver node? I have a lot of buildings and i want to generate the pipes without running the timeline, any ideas? Thank for the help!
  23. Hi, Iam doing a small vex RnD, i have some points with @active=0 and i make them @active=1 randomly by point number over time. lets say i have given them an attribute @temp =0, all i wanted to do is the value of @temp should increase from 0 to 1 gradually over frame when @active=1. for example, if the @active = 1 at frame number 30, the value of @temp of the same point should increase from 0 to 1 from frame 30. thanks in advance
  24. Hey guys! I'm trying to wrap my head around the solver sop. I have an alembic geometry that needs an attribute for the frame any point started changing position. What I tried was, inside a Solver SOP, appending a Point VOP where I subtract the rest position from the new one, compare the length of that delta and then write the frame on an attribute. The test and such works fine, but then my frame keeps changing, which I understand that it happens because I haven't figured a way to stop the value from changing. What I'm trying to achieve is to do a color ramp on the points by the attribute that tells which frame started moving. Any help will be very much appreciated! 20200316_CubeAnimation.rar
  25. Hello guys, Just a quick question. I'm studying new Sparse system for Pyro Solver in H18. First change I could see is that Pyro Solver sparse has 4 inputs rather than 5 and “Velocity Update” input is missing. Let's say I want to use a Gas Disturbance micro solver for sparse smoke. How I can connect it to the solver? “Shape” tab in the solver already has a Disturbance option. But, of course, the result is different if I use only the Micro Solver connected to the last input (Forces). So I guess, this approach is wrong. How I can achieve same result using only Micro Solvers? And, first of all.. Does new Sparse Solver allow to use micro solvers? Many thanks!
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