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Found 30 results

  1. Looking for text animations

    Looking for a talented Houdini artist who can do procedural text animations. We have an upcoming project that requires it. The resulting geometry should be dynamic, procedural, however, lightweight as it will be baked out and used on mobile devices. Please include links to any work you have done in this area, as it will help us filter down the candidates. Thanks!
  2. How to delete dynamic points by group

    Hello, I made a rigid body simulation where I have different kind of pieces, like pavement, road etc. I grouped them in a group called "group1" How can I write this in vex in pointwrangle? Take the group1 and if the points in group1 are under -1 in @P.y then delete them. Thank you for your help
  3. Dynamic Constraint Help

    Hi All, Wondering if someone could take a quick look. I'm having a hard time trying to get these dynamically created constraints to stick to this animated passive object. is my approach wrong ? What I'm trying to do is Have the sphere hit the wall, then pull away some pieces like its stuck to it. I've seen several approaches to this, but have not seen it done on a passive deforming mesh. Which is what the sphere is setup to be. Rich Lord has a some great examples of sticking constraints on fully dynamic meshes. any direction would be appreciated ! dynamic_constraints_deformingmesh_17.hip
  4. Dynamic Fire Hose - Vellum

    Hi guys, I'm fairly new to houdini and I got stuck on a sim and hoped you might be able to help. For past two weeks I've been trying to create a dynamic fire hose - something like this. It seemed like a very simle task - vellum cloth hose somehow attached to rbd metal connector - but I just can't seem to get it to work properly. In the scene I'm working on the hose should float for a bit with some turbulence and interact with other rbds floating around and then fall to the ground and hit floor collider+other falling rbds objects. I'm using strut softbody in vellum and it seems to work pretty ok out of the box. The folding on the ground doesn't look that great, but thats probably just a matter of tweaking the settings. I managed to add some turbulence through the windforce node in DOP network. I wanted to figure out how to constrain/attach the end of the hose to the rbd connector. At first I tried using vellum attach to geometry and set the max distance parameter exactly as I needed. That worked great with static geo, but didn't work at all with rbd object. Not sure if vellum is incompatible with rbd, or if I just set it up incorrectly - I used shelf too RBD object and connected it through the dop import to the third input in vellum attach to geo node. When this didn't work out I thought I might be able to get away with merging the hose and connector into one obejct and then paint a mass and stiffness maps, so that the hose is soft, light and will fold on the floor, but the connector will be stiff to the point it will behave like RBD and heavier than the hose, so that it would pull it down. I created primitive stiffness attribute and then painted a map - the hose is black and the connector is white. In the vellum constraints I set both bend and stretch stiffness to scale by attribute and was expecting that the hose stiffness would be multiplied by 0 and thus would pretty much collapse on collision, while the connector would be scaled by 1 and the stiffness would be according to the stiffness value. But when I use scale by attribute the entire object gets completely flattened on collision and there is no difference between the connector's and the hose's stiffness at all. Also I was unable to find a way to adjust mass with attribute, so I'm not sure if this is even viable solution to my problem anyway. How would you approach something like this? TL;DR: What's the best way to create vellum hose and attach one end of it to moving rigid body with mutual interaction? EDIT: I managed to get the stiffness map working on a dummy scene, but still didn't figure out how to adjust mass by attribute/group. Is it even possible? Apologies in advance if it's something really simple and obvious! Thanks for any help!
  5. I would like to know how to make the effect of the object go deconstructing gradually as the helmet of the star lord in Guardians of the Galaxy
  6. Hello houdini wizards! I am playing with Vellum and trying to get the dynamic glue constraints to work. The documentation is about 1 very small section and I did what it said to (like creating the glue inside the solver and setting the Create Constraints drop down to Each Frame) but it does not grab the cloth. I played with distances and groups but no luck. I don't have a specific scenario at the moment so no scene file really that cant be set up in 2 minutes, just a grid as the cloth object, a sphere (fed into the collision input at the sop level) that dips down close the grid and then moves back up. The intention is to have constraints be created to grab the cloth within the set distance, pick it up, pull it, and then release/break the constraints when I want/need to. The breaking I can assume is pretty simple using the broken attribute in the Constraint Properties but I cannot seem to dynamically create constraints to grab the cloth/grid. Any help or knowledge you can give is much appreciated! I was unable to find any example files on the subject either but I did see the demo of it being done (https://vimeo.com/313872854) around 24:50. And again, thanks in advance for any advice you can give!
  7. Hello there, Is there any way to create Geo dynamically inside a dopnet? Specifically, i would like to have growing tendrils, and simulate those as they are created using popgrains. I created a popwrangle inside my dopnet, and created new points and primitives through vex. Unfortunately, that breaks the pop solver, as its not solving the newly created particles (However, if I put a force after the popsolver it works). I thought maybe that resetting the id to -1 (as used in a similiar way with the bullet solver) would do the trick, but unfortunately not. Is there any way that I can force the popsolver to recognize those newly created particles? Thanks in advance, Bajt createGeoinPop_v01.hiplc
  8. growing dynamic curve

    Hi, Currently banging my head against a brick wall on how to create a similar effect to the play-doh looking, growing worm things in this great Ditroit piece: Wondering if someone could give me a little nudge in the right direction? Or a good place to start looking? Up against it a little so don't have a huge amount of dev time! Cheers!
  9. Group rbd packs that broken

    Hi all. i did this tutorial : http://shortandsweet3d.blogspot.com/2018/06/animated-constraints.html now i'm wondering how can i make a group of shattered piece and mask them on some forces. for example in the tutorial, detached pieces don't affected by impulse force. Thanks.
  10. Hi, I have a very simple DOP network with 2 static object colliders. (Houdini 16.5) In my scene, I'm instancing sphere on the particles from the DOP simulation. The spheres are instanced perfectly to the particles of the dynamic sim, but they are also wrongly getting instanced on each verts/points of my collider objects (the 2 staticobjects on the top left). My instancer node in the scene is set to "full point instancing" (in the point instancing option), which could be the problem, but that is the only option that instances the spheres to my partciles. Any tip would be greatly appreciated. Thanks
  11. Explosion Rbd with pyro clustering

    Hi, i'm working on an explosion scene with pyro that existing from pop trails. but when i simulating my pyro, the area of sim is going bigger so much and killing me. i think there is a way like on that video is there any way to make multi containers like clustering my rbd explosion as like that for speed up sim? i attached the hip file that i found on web and learning from it. Rbd_Explosion_With_Smoke.hip
  12. https://www.hossamfx.org/trees-rigging-in-houdini/ Hello Everyone : this tutorial is about creating and animating trees in Houdini FX in Procedural way . you will learn how to create your own tree model and how to animate it in different weather like windy day, normal wind ........etc. also you will see how to simulate a growing process : what i mean in growing is : you can select at which age of tree you want to start growing to final complete model , so you can start growing from zero or you can grow from winter tree to a beautiful spring tree with leaves and young branches . i will show you firstly how to create a tree model in SpeedTree software for about 1 hour and then move to Houdini and create python code to define the hierarchy of branches and build a procedural wire dynamic network with some math concepts of course . Houdini rigging tools and chops techniques in our list also to add more option and realistic to animation . in the link you can find more description about this tutorial . More info Here: https://www.hossamfx.org/trees-rigging-in-houdini/
  13. Dynamic RBD - Houdini to Unreal

    Would anyone know how to pre-fracture geometry in houdini, bring it into unreal engine and have it be dynamic (responsive to real-time collisions)? I know unreal has a way to do it and be dynamic, but Im wanting to be able to art direct from houdini for the area where my collision will happen in the level. I have already tried pre-fracturing with voronoi and exporting as alembic and fbx but no dice. Just wanted to see if anyone had a solution to this. Any ideas?
  14. Hey people, I heard this forum has a lot of really talented and technical oriented people who can help me out of my problem. At work I have to do some research and create a little scene where a car SLOWLY falls down a cliff. Imagine someone would push a car down a hill without a driver and it falls down to hell. So as a Houdini-Newbie I imported an OBJ of a car and declared it as an RBD-Object. My simple-geometry-plane is a static object. Through the gravity tag my car "rolls" down that hill and jumps over the cliff. But there is one problem. The center of mass should be more in the front of the car. Is there any easy way to move the CoM-point to the position where the engine sits? I tried different things like pushing the pivot aso. but nothing worked. It seems like Houdini tries to calculate the center of mass in the Object-Level with a bounding box and ignoring my custom moved pivot. Is there an easy way to define an exact point, where my center of mass is? Or is there any way to show it at least? My goal is, like you will see in the screenshot, that my car falls down a little bit faster in the front. Like it would behave in real world. Now it is pushing itself over the cliff until it gets over the center point of the OBJ. Thanks, Bastian
  15. Hey guys, Im creating some procedural Sawdust using the copy sop onto a point selection - i want to sim the objects then dropping onto the terrain for placement, but so far have had no success - tried changing collision modes in Bullet but think the main issue is its all connected as such? (have tried convex hull and per connected set of primitves with no luck etc) and cant think of a way using the skills i have to select every peice of geo individually and then make dynamic quickly without doing it manually (which with thousands of peices of geo is not a good idea) Any help or ideas would be great Thanks Chris
  16. Hey guys, Im creating some procedural Sawdust using the copy sop onto a point selection - i want to sim the objects then dropping onto the terrain for placement, but so far have had no success - tried changing collision modes in Bullet but think the main issue is its all connected as such? and cant think of a way using the skills i have to select every peice of geo individually and then make dynamic quickly without doing it manually (which with thousands of peices of geo is not a good idea) Any help or ideas would be great Thanks Chris
  17. FEM constraints

    Isn't it possible to constrain some arbitrary points of one solid object to the points of another one? The SBD seems to expect a matching set of points between the two objects, which I assume works well when the two object have tets that perfectly touch each other. Is there another way to attach two solids that slightly intersect? thanks
  18. RBD make breakable question

    Hi, I'm struggling :/ I got a tall box (a building) I'm voronoi fracturing it. I got on big chunk at the top and many smaller at the bottom. I got a glue constraint network with some link deleted, so they can fall on the ground. Now I'd like the big chunk to be breakable so it can fracture when hitting the ground. So I use make breakable shelf tool and I would like to apply it to the big chunk only. There is a group field at the yop of the "voronoi fracture configure object", but I just can't manage to select the big chunk only. I should mention that I'm importing the fractured box as packed rbd. If I don't I have access to pieces in that group field, but with packed option, no more. There's a s@name attribut, but I can manage to use it :/ I'll make a hip file soon, but in the mean time, if someone knows where is my mistake or a solution...
  19. plants wind dynamic pipeline

    Hi guys I'm working on a field plants dynamic and set dressing project like the attached image; So I'm confused about the pipeline for simulating the wind effect. I used wire solver and I simulated some of plants individually but for scattering those, I should use rotation for different look and now the wind direction won't look right. also simulating all the plants together is not an easy and efficient task. So is there a better way? can you please give me a hint? Thank you
  20. min_activation_impulse problem

    Hello all, I'm using Houdini 15 and the new point feature of min_activation_impulse together with active and activationignore. It's a simple bricks wall and a cone smashing bricks. The problem is Whatever value I put for min_activation_impulse, as in the scene is 500, the bricks react always. What am I missing? Thank you bricksWall4odforce.hipnc
  21. dynamic ice fracturing (SOLVED)

    Hi everyone, I'm trying to create a dynamic cracking ice wall. What that means is that I have a wall geo that needs to be cracked (multiple times possibly) based on an impact object (or anything really) but it cannot be pre-fractured due to the ice nature. I've been trying by haking the fracture parm (voronoi fracture config obj) node and tried with a SopSolver in DOP as well with no decent result. I was wondering if you had any ideas on how to approach this. Here's a photo of the ice crack shape I'm trying to go for: https://www.flickr.com/photos/dreamofdata/5434655197/in/photostream/ Thanks for any help. Diego
  22. Crowd dynamic distance ?

    Hello ^^ I always tweaking my vase scene with crowd but I have a real big problem: I don't understand why my vase reacts beforce my agents touch it :/ I don't really how to change the dynamic/bullet parameter in Crowd nodes tree :/ Please help me I'm kind of lost :/
  23. Feather system development

    Hello everyone! Right now I'm in a process of doing feather system for my character. I'm doing it based on the fur system - I'm taking its guide curves and adding a sweep on them to get patches. Right now I'm working on orienting them right. When I get some decent result I'll show it, but for now I want to know, does any of you have some ideas of how to do feather system? Maybe someone already did one and know where to start?
  24. Hey Everyone on this beautiful sunday! So, as I am touching pyro for the first time, of course I am using the "Gas Resize Fluid Dynamic" node (from here on out called the "resize node") in my DOP-net to auto adjust the grid size. However, I a getting this slight flicker in the simulation, as long as the container size is being modified by the resize node. As soon as the container has reached its maximum size, and no resizing is going on anymore, flickering stops. Turning off the resizing and letting the container have static dimensions, also eliminates the flicker of course. Anyone out there familiar with this? I tried messing around with the resize-node's "Subtract Threshold" parameter, since it seemed to me (from the help) this might be connected to the problem somehow? But no luck so far.... Thanks for having a look people. resizing active, flickering results before the gridsize comes to rest resize_flikr.avi resizing disabled, no flickering noresize_noflikr.avi --------------------------------
  25. Hi everybody, I'm looking for a way how to create dynamic constraints with Bullet. The basic way doesn't work. Take a look at hip file please to see the problem. Any help would be appreciated! Thanks! bullet_dynamic_con_issue_v01.hip
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