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Found 23 results

  1. Vellum Custom forces

    Hello, Can you please help me? I have a custom vortex force and I would like to apply it to vellum solver. How Can I do that? Thank you Gabor
  2. Hi Everyone, I'm a student and I'm working on a project in which I need to recreate a scene similar to a Venice's canal. So I'll have buldings on both sides and water between them. There will be also a flying object that will fall and collide with water. This is the first time I work with water inside Houdini. What I need to know is what is the best workflow? I'll create a custom geometry in Maya for the container of the water, it will be an irregular shape. How do I set it as a container? Since there will be a collision, I think the best solution for water is to use FLIP fluids, right? Also if I use this way I will have many particles, so what is the best way to proceed in terms of memory, simulation and rendering? Attached you can find a really rough sketch of the idea. Thanks in advance.
  3. Hi people, been lurking around here and gathering all the knowledge you are sharing, so thanks to each of you contributing to the forum. Lately I've been trying to understand another side of Smoke simulations and ways of controlling them. Before posting this I've gone through the most popular posts on the forum like "getting rid of mushroom" and others where there is tons of knowledge to pick up, I've also read the documentation on Microsolvers (Analysis, Match Field,...) multiple times in hope to understand which nodes to use and how to properly set them up. Could somebody point me to any resource to understand the workflow on building custom fields, how to use Gas Analysis, how it's related to Gas Match Field and some other aspects of these MS. I've been trying to understand what the documentation is saying and it's still a bit blurry to me compared to how other nodes are so well explained. A few days ago I've only read a quick post about building one but it doesn't explain much, it's more in the likes of "click this and click that, done". Apart from cracking open the Pyro Solver and individual Gas Microsolvers, where have you people picked up the knowledge / workflow on building custom fields. For what I've noticed people making tutorials and forum posts tend to steer away from anything that isn't Gas Turbulence, Shredding, Disturbance. Even a quick clarification on Gas Analysis / Calculate and it's common uses from you experienced people would be a massive help. Many Thanks!
  4. How would you render the furthest ray hit surface? I'm not even sure where to start. Well, that's not entirely true. I have an altered shader using IsFrontFace to "turn off" the camera facing polygon. The problem is that this only gives me the next surface behind the first. Which is great if one is rendering a simple convex shape. But for a more complicated concave shape, like a wildly rippling blob of liquid, this isn't very usefull for comp. notBackHelp.hip
  5. How would you auto-magically remove the trailing "1" after an instance of a custom OTL? It seems like there should be some on-creation script location, somewhere...
  6. Hi so Im stuck here... I have this basic setup, with ready to go agent its work well.. I now need to switch Agent geo to a custom "Fatty" one.. So I bind it to a joints from agent setup, "baked agend" but it looks like whole new geo is binded to just a root joint... Cant figure it out. H17 B. Custom_Agent_Help.zip
  7. Hello guys, Is there a way to create to dynamically create curve point custom handles ? I know I can create a simple curve in HDA and export the curve handle to the HDA, but I can't animate the curve position and edit the curve after. The curve node doesn't take account of the transform node, so it's a bit wierd to modify the points of the curve when the result is 100 meters away. Any help would be appreciated !
  8. Hello! I defined a custom vex function in Attribute Wrangle node, and i can call it only from this node, when i call it from different Attribute Wrangle node i get Undefined Function error. Is there a way to declare a function in one node and to call it from the other node? The only way i found is to use external files with the #include filename.
  9. Import attribute into VOPS

    So I started watching this excellent tutorial about creating a spiderweb and got 3 minutes in.... https://www.youtube.com/watch?v=LFkzD9cgxek It's over my head with the coding at the moment so I thought I would try to create the same with SOPs and a bit of VOPs. I got pretty far pretty quick, and everything works so far (some dodgy maths, and weird values that work), but I am stuck on the VOPs bit. I want to randomise the rotations for the spar angles, I have them setup as primitive attributes, each one having a different number. I can get the attribute into VOPs (I think), but I'm pretty stuck at how to implement the randomisation per piece/attribute. Any help appreciated. HIP file attached. ) spiderweb_v002.hip
  10. Ok so just when I thought I had got my head around for each loops, I am struggling to get a custom attribute into a transform. The attribute is certainly seen by the copy to points node. and when I try to detail it in the transform, it justs gives back a zero. I've tried by including the transform in the for each loop, with a block begin fetch input etc. Makes no difference. (Using the spare input and -1 tag instead of the "../iteration". I've tried all combinations of cases @ signs, $ signs and whatever else. The "global attributes" colour and the scale nodes work fine. effector_v003.hip
  11. Hi, rebels! I`m currently looking into some Houdini flip RND and I got this shot where I need to paint friction attribute on one side, e.g the water falls faster on one side of the ground. Is this a straight forward thing or is it a bit of a pain in the "!$ due to the nature of water? I attached a test file so you guys can get a sense of what I`m talking about friction_water_test_v001.hip
  12. Advice for building a computer for FX

    Hello, Over the summer, I'm planning to build a new PC for doing FX work (and also just general purpose). My brother put together this spec on pc part picker, (since he's more knowledgeable than me when it comes to hardware) but I thought I'd ask for advice as to where I should spend my money. Here's what I'm currently looking at: I've never built my own PC before so any advice you could give would be really helpful!
  13. Hi there, Very basic question, what is the correct way to get a custom shape volume, for example a spherical volume? When you plug geo into the volume node all it does is put a square bounding box around the geo. many thanks in advance
  14. Hi everyone! I'm relatively new to Houdini, and I came across a tutorial which explained the bullet solver for H13. I am trying to recreate the effect that he got at 53:15, where primitives were deleted from the constraint network when a force over a certain threshold was applied. tutorial: As I understand, the SOP solver was changed in H14, and I therefore don't have the object merge node that he has. I downloaded the example HIP file and copied his node into my own project and managed to get it working, however I'd like to know how it actually works, rather than just copying and pasting! The data that the node is bringing in, is as follows: `stamps("..", "DATAPATH", chsop("relnode") + ":Relationships/" + chs(chsop("relnode") + "/relname") + "/" + chs(chsop("relnode") + "/relationship/dataname") + "/Geometry")` This isn't like anything I've come across so far in houdini - if anyone knows what this means, and could explain it I'd be very grateful! Best, Stephen
  15. I have a popnet creating some particles with the POP spin, to have a random rotation in each particle, also Im copying a tube in each particle, the tube rotates as it supposed to, but when they hit the ground, the tubes stays with a random rotation as well instead of pointing Y. I'm thinking that if I use the normals instead of the POP spin I could blend between the N0 and N1 when the particle hit the ground, using the hit info from the POPnet, but truthfully I don't know how to achieve this .-. I'm using POPs and copy the tubes/coins to the particles because the particles born magicaly from the floor after a character hit the floor with his cane. If anyone could help me or have any idea I would appreciate it!!!
  16. Custom Wave to Ocean

    Hi everyone, Im trying to add custom big wave to Ocean and Dop network. For polygons everything works fine, but for other fields like surface and vel its now working and of course dop isnt working well, i dont know how to add it or how to deform other field like polygons. Here is the scene: custom_big_wave01.hip
  17. FLIP morph custom forces

    Hello everyone, I am trying to achieve a similar effect likes this by Ivan: On the sidefx forums, Ivan mentions that he creates two fields, one to attract the particles and one to keep the particles on the surface. I managed to create the force field to attract the particles but i cant find a way to create a field to keep the particles inside the geometry and form the shape. Any tips or help is highly appreciated.
  18. MainMenuCommon.xml Hotkeys

    Heya, I've created a custom menu tool and added it to the menu using the MainMenuCommon.xml file - is there a way of soft-setting a hotkey to it within the xml, i.e. for multiuser project-based deployment? I'm thinking that adding the HotkeyOverrides file might work but if it's possible to keep it all contained in the single xml file that would be far tidier.
  19. Our new Houdini artist profile is out! Talented FX TD Alejandro Echeverry from Colombia explores how to create custom tools in Houdini and tells us a bit about his life as a VFX artist: http://www.gridmarkets.com/alejandro-echeverry.html I hope you find the content informative and entertaining. We certainly had fun working on this feature! Patricia and the rest of the GridMarkets team
  20. R.I.P.D DeadoDeathFX

    Hello, Not sure you ever stumbled on this work of mine but I wanted to post this anyway. This work didn't make it into the movie the way you see it in the video and although its been inspiring and helpful for other artists to accomplish the director vision it's pretty much remained a solely piece of home work And so I'm sharing a hip/bgeo file of what I did in my spare time before I took it further at work. With the hope there will be something useful in there for anybody here willing to give it a try. After all, sharing is caring! https://vimeo.com/106126363 Alessandro
  21. ..., where can I change them? Are they available somewhere? Thanks!
  22. This could be a simple fix or a dumb question but I just started trying to learn houdini about 5 days ago so I'm lost and new to the package. I did the tutorial on the sidefx site with the volcano demonstration to show how to use the pyro tool preset and really liked how you could make a custom velocity field out of a box and converting it into a volume and doing some vex in the volume sop. So I wanted to experiment and try creating a custom vel field but out of a more interesting shaped volume. I made some sort of corkscrew looking geo and used an IsoOffset to create the volume but this is where the setup breaks. I know when I converted the box to a volume using the volume sop I changed the rank to a vector and I dont know how or where this option is when you convert a surface using the iso offset sop.?? When I middle click on the isoOffset, I see there is just one volume being output and when i middle click the volume sop it has 3 volumes listed. I Think this is where my problem is but again been using houdini a week and have no idea if this is the reason or not. When I plug the volume that is created by the volume Vop into the chain I get the nice curl noise showing up and when i swap it to the volume generated by the isoOffset then its just straight lines which would make sense i guess if it only is a scalar volume field. So Is there any way to convert the isoOffset volume to have a "rank" of vector.?? Or is there an entirely different/easier/correct way to make a custom velocity field that is a shape more complex than a simple box or sphere.? I'm trying to make the switch from Maya to Houdini but being a 13+ year user of maya it's VERY different from what Im use to working with. However the power in Houdini already is making me wish I made the switch a long time ago.! Thanks for any help/info.. E
  23. Hello all. We need to expand the default Mantra Material with some custom functions and compile it. However, as time goes on, bugs are fixed and major/minor Houdini releases changes the shader internals, making it a hassle to continuously go back to the material, check it, fix connections if necessary and recompile. I'm wondering if there is a better way to do this? I have thought about rebuilding our customizations using a python script, but with potentially hundreds of new nodes, connections and unknown future changes by Sidefx, this too have the potential to generate unwanted labor. I have also thought about using DAs, but many of the connections are not easily contained within one or a few assets (in and out of the surface model for example). So, I ask: Is there a preferred way to maintain what sesi does and smoothly inject our own before compiling the material?
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