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Howdy folks! I've recently started looking into Vellum and I am currently trying to create interaction/collision between Vellum grains and Vellum Hair however it does not seem to come as easy as interaction between grains and cloth. I've used the same setup that worked with my grains and cloth example to make this setup however as mentioned above so far I've had no luck in making it work. I am sure that there is something very basic that I am missing here but I can't seem to find it. Any ideas? Screenshots of the setup(Sorry for less than optimal/clean node layout): Scene file as well as base model too if you'd rather dig into it. Vellum_Hair_Grain_Test.zip

Hey Everyone, I'm setting up a pretty basic vellum cloth simulation > a pop wind and a pop force as gravity only operating on one group and that group grows over time. now, when I let it run the solver seems to delete primitives as some kind of tearing effect (ripping apart the cloth under stress) I don't know. some primitives turn black and then they disappear. It's a kind of tearing effect that I want to avoid or disable, I just seem to not find the setting. I do have welds in the setup but breaking is disabled. I really don't want no tearing at all. It would be great if someone can push me in the right direction. Cheers captue_0002.mp4

Hey hey, a little question. Why I was get this render (1)? How can I get render like this (2), but with transparent background? Thanks

Hello everybody, I have a problem with the boolean tool. I have a cube and a font. I want the font to be inside the cube, but in the form of a hole. First I tried to subtract the font from the cube with the boolean node, but that didn't work, so tried to fracture the cube with the voronoi node first and then added a boolean node, but that didn't work either. Does anyone know a solution for this or can help me? Thanks in advance! This is what I want to achieve: This is my attempt with the voronoi fracture: This is my node tree: These are my parameters:

I need to create a HDA with uisoparm handle which will be show/hide on hotkey, and dynamically tune different parameters in my hda. For example by pressing some hotkey it will tune param0, and after pressing same hotkey it will tune param1, etc... The problem is that I can't understand why uisoparm handle doesn't shows in viewport after its creation. Another handles like circle, xform, vector works fine. template.bindHandle("circle", "my_handle") But uisoparm handle doesn't appear in viewport , and I can't understand why here is example of my code. also I attached a hip file with hda. import hou import viewerstate.utils as su class State(object): def __init__(self, state_name, scene_viewer): self.state_name = state_name self.scene_viewer = scene_viewer self.node = None self.start_pt = None self.end_pt = None self.displayRotHandle = True self.start_handle = hou.Handle(self.scene_viewer, "rotate_start") self.end_handle = hou.Handle(self.scene_viewer, "rotate_end") self.displayCarveHandle = True self.carve0_handle = hou.Handle(self.scene_viewer, "carve_0") self.carve1_handle = hou.Handle(self.scene_viewer, "carve_1") def onEnter(self, kwargs): self.node = kwargs["node"] # rotation handles init self.start_handle.disableParms(["tx", "ty", "tz", "rx", "rz"]) self.end_handle.disableParms(["tx", "ty", "tz", "rx", "rz"]) self.start_handle.show(True) self.end_handle.show(True) self.start_handle.update() self.end_handle.update() self.displayRotHandle = True # carve handles init self.carve0_handle.show(True) self.carve1_handle.show(True) self.carve0_handle.enableParms(["input", "k","onoff"]) self.carve1_handle.enableParms(["input", "k","onoff"]) self.carve0_handle.update() self.carve1_handle.update() self.displayCarveHandle = True self.start_pt = self.node.node("start_pt").geometry() self.end_pt = self.node.node("end_pt").geometry() def onMouseEvent(self, kwargs): """ Find the position of the point to add by intersecting the construction plane. """ ui_event = kwargs["ui_event"] device = ui_event.device() origin, direction = ui_event.ray() return True def onKeyEvent(self, kwargs): ui_device = kwargs["ui_event"].device() self.key_pressed = ui_device.keyString() if self.key_pressed == "a": if self.displayRotHandle == True: self.scene_viewer.showHandle("rotate_start", 0) self.scene_viewer.showHandle("rotate_end", 0) self.scene_viewer.showHandle("carve_0", 0) self.scene_viewer.showHandle("carve_1", 0) self.displayRotHandle = False else : self.displayRotHandle = True self.scene_viewer.showHandle("rotate_start", 1) self.scene_viewer.showHandle("rotate_end", 1) self.scene_viewer.showHandle("carve_0", 1) self.scene_viewer.showHandle("carve_1", 1) return True def onHandleToState(self, kwargs): # Called when the user manipulates a handle handle_name = kwargs["handle"] parms = kwargs["parms"] prev_parms = kwargs["prev_parms"] node = kwargs["node"] if handle_name == self.start_handle.name(): # user manipulates rotation start handle node.parm("rot_start").set(parms["ry"]) if handle_name == self.end_handle.name(): # user manipulates rotation end handle node.parm("rot_end").set(parms["ry"]) if handle_name == self.carve0_handle.name(): # user manipulates carve 0 handle node.parm("carve_0").set(parms["k"]) node.parm("first_u").set(parms["onoff"]) if handle_name == self.carve1_handle.name(): # user manipulates carve 1 handle node.parm("carve_1").set(parms["k"]) node.parm("second_u").set(parms["onoff"]) def onStateToHandle(self, kwargs): # Called when the user changes parameter(s), so you can update dynamic handles if necessary handle = kwargs["handle"] handle_parms = kwargs["parms"] node = kwargs["node"] if self.start_pt != None: pos_start = self.start_pt.point(0).position() else: pos_start = [0.0, 0.0, 0.0] if self.end_pt != None: pos_end = self.end_pt.point(0).position() else: pos_end = [0.0, 0.0, 0.0] if handle == "rotate_start": handle_parms["tx"] = pos_start[0] handle_parms["ty"] = pos_start[1] handle_parms["tz"] = pos_start[2] if handle == "rotate_end": handle_parms["tx"] = pos_end[0] handle_parms["ty"] = pos_end[1] handle_parms["tz"] = pos_end[2] if handle == "carve_0" : handle_parms["k"] = 0 if handle == "carve_1" : handle_parms["k"] = 1 def createViewerStateTemplate(): """ Mandatory entry point to create and return the viewer state template to register. """ state_typename = kwargs["type"].definition().sections()["DefaultState"].contents() state_label = "Denis test dynamic handle" state_cat = hou.sopNodeTypeCategory() template = hou.ViewerStateTemplate(state_typename, state_label, state_cat) template.bindFactory(State) template.bindIcon(kwargs["type"].icon()) template.bindHandle("circle", "rotate_start") template.bindHandle("circle", "rotate_end") template.bindHandle("uisoparm", "carve_0", "ownerop('carve_0') owneropgroup('group')", cache_previous_parms=True, handle_parms=["input", "k","onoff"] ) template.bindHandle("uisoparm", "carve_1", "ownerop('carve_0') owneropgroup('group')", cache_previous_parms=True, handle_parms=["input", "k","onoff"] ) return template carve_python_states_v01.zip

Hey I have some issues with my scene. As you can see in the image, the ocean looks strange. Also there are a lot of tiles repeating again and again, also inside the Non-Region. In this render the wave high is okay. But in other stuff it is not. You can see this here: Not only that the wave is too high (I do not find where the change this or I do not have a result inside the viewport idk), it looks like the water goes threw the ship hull, which would look weird. Any ideas on how to fix this? Edit: I also have the issue that the ocean flat tanked created the water not in the central where the ship is. I tried to fix this but nothing really work. Honestly I do not know the reason why it went this way anyway. I think Houdini is a very powerful software, but I am new to it. As always it will take some time to learn but helping me with this would really help

Hi, i've been trying to export my fur from Houdini to be rendered into maya with redshift through rop alembic, but when I cache the nurbs they don't render at all, so I tried to convert the fur with a polywire and exported in fbx. It works, but it's still a polywire, what am I supposed to do to maintain the original fur? (Tried to install redshift in Houdini for a proxy export, checked the .env file with the correct path installation, but the plug-in won't show off in the houdini shelf). Should I try to cache in bgeo and make the hairgen a digital asset with Houdini engine or there are other ways to make this work? I'm using Houdini v. 18.5.408 and redshift v. 3.0.31.

Hello all, Hope you are doing well. I have been facing issues trying to launch Houdini 18.5.351. I tried checking the SideFX website but have been getting a few 504 gateway timeout errors on the page. Does anyone know if SideFX is doing routine mantinace on their servers thus causing problems with the liscence server and Houdini launch? Thanks in advance.

Long story short, my pyro sim bleed no matter what. more substeps, changing the advection type, changing the resolution of the sim, using gasenforceboundary, it always bleeds. ClabazaPyro.rar Maybe I am missing something but tbh it is a really simple setup. I didnt bother to add the micro solvers because I want to fix this first. thanks on advance

Hi everyone I am battling to remove a strange artifact showing of a dark dot and sometimes a dark line when compositing the emission layer in Adobe after effects and Davinci Resolve I have attached the simplified houdini file with the sky texture and its ready to render to see where the problem is So, I render the following AOVs from Houdini 18.0.532 using the latest redshift 3.0.27 I render the following aovs as exr: beauty_aux.exr diffuse.exr emission.exr gi.exr reflection.exr refraction.exr specular.exr z.exr The sky image is an exr which I applied on a redshift dome light inside houdini I follow the guideline on how to composite all these aovs into a final image in Adobe After Effects and Davinci Resolve and i place the layers in the following order: diffuse, + gi + specular + reflection + refraction + emission The emission aov ends up showing a dark spot especially arounnd the area where the sub is at its brightest sometimes it even shows an entire dark line again around the area in the image where the sun is supposed to be at its brightest this artifact only appears when I switch my project setting to run on 32bit per channel and even when i try to load the beauty aov exr, i get the same dark spot so this issue is not just limited to the emission aov Then moment i switch the project to run on 8bit per channel, the dark dot and dark line artifacts dissapear but then in Adobe after effects, i end up losing the ability to bring back the sky colour and details, the image ends up looking flat and even when i adjust the curves on the colours, the image remains flat looking Thank you __Sky_Artifact.rar render.zip

Hi I've been working on a personal project to learn some grooming simulation with houdini, but I can't make it work on my animated wolf. The wires just broke when they have to be simulating properly, I've tried a lot of things but nothing seems to work for me. If you know any solution please reply, I will be waiting for any type of information, thanks. hairtest_problem.hipnc lobito.abc

I just downloaded Houdini's free version for the 1st time, and it does not look like as in the youtube videos or other places where I saw it. So it looks like that: and i don't know why. I deleted Houdini and install again and again and it is looks like this again and again. Please help me.

Hi guy. I had been working with redshift for over a month already and I am in the middle of a proyect. Suddenly when I open the proyect EVERYTHHING failes. There isn´t a single redshift node working: This is my env: PATH = "C:/ProgramData/Redshift/bin;$PATH"<font></font>" HOUDINI_PATH = "C:/ProgramData/Redshift/Plugins/Houdini/17.5.173;&" It looks like it uninstalled itself somehow. I really don´t know what did I do. It just stopped working from one day to another. I tried resenting the pc and reinstalling redshift. I hope you can help me. Thank you

Can anyone give me advice in rendering my water simulation? PLEASE WATER SURFACE CACHE is flickering for some frames! I attached image of 2 frames, first one is flickering and the other one is not. Just some of this frame has this problem and I have no idea what is wrong with surface cache. I rendered this water surface with glass material, and I've tried render with other material but it was same with flickering. And Surface_cache seemed fine with it's shape. Is it problem with Normal? Please let me know if you have any ideas. THANKS!

32GB Ram 3200mhz ryzen 5 1600 Hi again guys. Basically I have been struggling a lot with cacheing a simulation. I´ve tried .bgeo .sim and multiple resolutions on the pyro I would hate to keep lowering the res because of ram issues. I diseabled "Cache Simulation" and I still keep on feeling my Cache. I dont mind waiting days for the cache if necesary (it is a big simulation, probably 40 meters long I guess) and to be honest, I might not know in depth how to control pyros. Hopefully you can help me here

Hello everyone, I come to you because I have a little trouble understanding a tutorial. Indeed I look at the tutorial "Abstract Effect a Houdini" the problem is that it is a version prior to 17 and since the node "For Each" has changed. So in the Tutorial it does as in the picture 1 to get the picture 2 I block here (picture 3) and there are plenty of node for each and I do not know which to choose. . . I tried several times but I can not get the same result. Do you have any ideas ? Thank you in advance everyone. os: sorry for my english, i use a translator

Hey, my problem are these boxes, which appears after some frames. I don't now how to get them away in the simulation. Maybe someone could help me

Hi all! First post, sorry is not to contribute much but to ask for help, hopefully someone else with the same problem can read about this and find the solution here. I have a problem loading geometry in Houdini 16 running on W7x64, no matter what kind of file the behavior is always the same, to hang for a few seconds, then display the Cooking message for a (longer than it feels right) moment and then returning an error in the node. The dreaded message in the ! Error field of the node is: Unable to read file "C:/Users/userName/Documents/fileName.obj". This happens either via FILE > IMPORT > GEOMETRY and also popping the TAB menu, typing GEOMETRY and creating a new node, double clicking on it and trying to browse to the file via the floating file chooser input. I have already tried with many different files and file types, creating a simple cube OBJ and trying to import it, to make sure the file name does not have any spaces or numbers, I have even dropped the file in the $HOME folder (/Documents in my case) to ensure was not a path issue. I also have tried to check my houdini.env file to see if something weird was overwriting the program defaults (all is commented out, no actual environment variables there), even to add a PATH | path-to-the-houdini-bin-folder; to the system variables to no avail. The default.bgeo that Houdini uses as placeholder is loading without any issue, so not sure if this involve a path problem, my guess is more a geometry interpreter related issue of sorts. Additionally, Houdini gets all weird after the geometry is unsuccessfully loaded with constant freezes and even if I can get to select the node and eliminate it, the behavior of pressing space/alt to cam-navigate the 3D viewport results in a constant spinning around (!?). I have added an image displaying the error if its of any help, would be great to know how to get a workaround to this issue if someone can give a hand, thanks in advance! Eth.

Hello houdini masters! I have a problem, with this simulation. It makes me those problems, which You can see down in those pictures. Can anybody explain me how to fix them? SHORT EXPLANATION OF THE SCENE: I created 5 human heads, closed inside the box (the box has wireframed edges). Those heads are Organic mass and the box is coliding static object. Heads are squeezed inside of that box. ISSUE: It shows me the tetrahydrons on the surface of heads, which is bad, i need smooth surface on those heads, and I also need material, which should look like rubber (i set up rubber material, but i tried make it a little bit softer) and also a want to make it softer in parts like nose and ears... And also i don't want let the surface come througth them selves (i turned on self collision, so I dont know where is the problem, and why material is sometimes doesn't coliding)? I hope I explained the issues, which i need to fix. Thaks for any advices! I really appreciate them THE .hip FILE WITH SCENE IS IN forum.rar TOGETHER WITH MESH HEAD MODEL forum.rar

Hi everyone, I'm trying to simulate paper using vellum and I can't get the friction and drag right. I kind of got the result I wanted, though I still don't understand those values. By "those values", I mean static and dynamic friction and normal and tangent drag. I'm a really visual person and there's no example or graph that show's how this works on the Houdini documentation, so I thought that maybe one of you would be able to explain it to me ? Thank you.

Greetings all, I'm working on a shot where I have a spinning falling cloth. In order to control it I have the center of the Vellum cloth attach to an animated object. It was working fine for a while, but somewhere when I iterated my .hip file up, the constraints started to be generated off center. I tried to match the settings from the previous correct one and even copied the properly functioning nodes over, but it was still misbehaving. I attached a photo of what it should look like vs what's going wrong. Even stranger is that in the attached .hips, there's a rogue switch node that if I delete it, the constraints won't form at all. It happens in both the correct and wrong versions. The switch node isn't even connected to anything in the stream of data as far as I can discern. The .hips are reduced from the larger shot I'm working on and the switch is a leftover from removing the collision geo after a certain point. For the moment I'm going to back step to the working .hip, but I was wondering if I'm missing a setting or this is just a bug. I have a hunch this might be an issue with using Vellum in a SOP context, but I'm not certain. Using Houdini Apprentice 17.0.352 on Windows 10. Thanks! haveahapyday_vellumConstraintIssue-correct.hipnc haveahapyday_vellumConstraintIssue-wrong.hipnc

Hey guys, I'm having a hard time exporting mov files on H17. I can only export avi files and the files are pretty huge. This is the error. Does anyone knows what it could be? Thx Alvaro

When I do some simulations like pics at bottom, Scene view become crazy like those .. I imported alembic files and set their position. but If I do simulations with dopnet, They are gone to randomly strange position like secone pic, and going to be black like first pic. When I delete scene view and make it new, It looks like when I set up. But I have to see that simulations preview and these problems make me crazy :S Help me with this plz !! Sorry for my poor English and thanks for read Have a good day

Hello, i am currently working on my final student projet where i make a plane crash with Houdini. I base the workflow of this project around the RIGIDS III tutorial by Steven Knipping. Everything is working fine until i bring in a simple glue constraint, and when the simulation gets activated at a said frame the simulation simply does not happen. It works when i disconnect/disable the constraint. I already tried to unpack the alembics upon importation with the alembic node but that didnt change anything. What is weird is that everything was working fine when i used the model given with the course. I haven't really found anything that helped me online, so hopefully one of you can help me with this issue, i would appreciate it A LOT. I will attach the files down below. Thank you ! plane_sim.rar

Hello People, I have been trying to produce a Boolean value i.e. 0 or 1,So that i can use it as condition for my (IF Block) in pointvop. But whenever i am dividing Ptnum by 2 using the node modulo is always leave a value of 0. Help!!