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Everything posted by ChazS

  1. @Noobini:: Wow, that was fast, thank you. I can see what you did, but have to get my head around it now. Thanks again.
  2. Hello, I'm currently messing around with sop solvers and have two questions that I hope you can help me with: I have 5 spheres in a scene being spun by popaxisforce node which also transfer their colors to a floor grid—and that part is working—but I can't see the spheres. When the solver is selected, they disappear despite their attributes being visible (middle-clicking the solver node). How do I get them to appear when the solver is selected? Second is how to cause the spheres to translate the points in minus-Y instead of transferring the colors (causing a rut in the grid)? Since the spheres are already affecting the point color, I figured that captured point data could be translated instead...?? I've tried creating groups and such but nothing I've done so far has worked. Any suggestions on how to approach this? Many thanks. missingSpheres.hipnc
  3. Collision not working

    Thank you Mangi! Your suggestion had me re-exam the instructor's setup, so it makes sense now.
  4. Collision not working

    I'm trying to drop some balls on a grid but have no idea why the collision isn't working. Strangely enough, it's able to transfer color, so why aren't the spheres bouncing off the surface as well? I understand that volumetric geo is typically used for collision surfaces, but in the class I'm attending the instructor was able to make this work. So, for the sake of learning, I'm trying to duplicate the same collision behavior using the same kind of objects. The file is attached if you don't mind taking a peek at it. Many thanks in advance. sopMadness.hipnc
  5. I'm wondering if the latest version is causing the disparity I'm having with using the popaxis node. I'm following a toot and getting a different result from the instructor. In mine, the axis (white line) doesn't track with the radius input of the envelope (red sphere). Anyone know why this is happening? Here's my result (which appears incorrect) since this oblong shape should be lying horizontal: Here's the instructor's, which works the way I believe it should...
  6. Like many other features of Houdini (at least with apprentice) the file reference only worked when my workstation had internet access. Until then I had the same error message. Houdini Apprentice v17.0.416 Windows 10
  7. Where do these Ops go?

    Danke 3Dome. Much of what you're saying is what I thought in the beginning, but my results vary so much that I'm not getting good sense of how this should work. So, just in case you (or anyone else) cares to take a peek, my latest attempt is attached as a hip file. Goal: It's an elementary attempt to destroy a castle tower with a cannonball. Result: It's a mess though. The ball simply passes through the tower without affect and its anim only plays at the obj level. I've tried including it in different ways, but all my attempts have proven fruitless. hotMess_v10.hipnc
  8. Sorry for the ambiguous title, but I'm not sure what an appropriate one would be. Hopefully reading my issue will clear it up. I've created a stony building under the effect of gravity and a ground plane, but am having issues with how to constrain the pieces of the building so they don't immediately collapse when the sim begins. There's a cannonball that's supposed to do its thing first... then gravity, etc.. In some tutorials, the dops is created inside the sops network (where my building is constructed). In others, it's at the obj level. I've tried using both methods but can't get the constraints and the all the other dops stuff to work together. I'm typically left with only one or none of them working. I've heard that dops and sops can be put together at will, but this isn't what I'm experiencing. Can someone provide a clearer rule of how/where these operators are supposed to be constructed? For instance, if I create all the geo for the building, should the cannonball be constructed in that same node, or should it reside on the obj level next to the building node... or maybe inside the dop itself? Just wondering since the dop calls geo via an rbdpackedobject node, so can't the dopnetwork node be inside the building or even the obj level...?? If so, where is the constraint node made?
  9. Understanding rand()

    Thank you anim, merlino and j00ey.
  10. Understanding rand()

    I'm trying to understand how to properly write/understand rand() functions. In particular, when emitting a particle from a random position along the x-axis, within a specific range (e.g. 2.5 to 2.9 units). My best guess is to write the following expression for the x-axis of the POP location node: fit01(rand($F), 2.5, 2.9)) but the particle launches from the same point every time since the starting frame is always the same. However, I don't know any other way to seed the start point to give it a sense of randomness (real, pseudo, or otherwise). Obviously I'm misunderstanding something here so if anyone can point me toward my mistake... Many thanks in advance.
  11. Understanding rand()

    Oops, my bad, but the typo was only here and not in the actual file. X-pos updates every frame (which makes sense given how this is written) but there isn't any randomization on the first frame, so it always starts in the same spot. How do I get the first frame to randomize?
  12. Physics Painter HDA

    Good to know. Thanks Noobini.
  13. Physics Painter HDA

    There's a very helpful looking tool called "Physics Painter" but I can't seem to find/download/install it. Could be my fault since I've never tried downloading a tool before in Houdini. Here are the steps I took: Launched Houdini v17 Asset Browser :: Clicked in the window area which launches Chrome and takes me to www.orbolt.com Signed in via SideFX account Search engine doesn't find it Manual search doesn't either Is this no longer available or am I looking in the wrong place? Here's the tool in question :: http://plugins.cgrecord.net/2018/03/download-physics-painter-for-houdini.html Thanks in advance and happy holidays.
  14. Physics Painter HDA

    I had searched there, but didn't have enough knowledge of Houdini to conduct a proper search. No matter now though, the toolset has been downloaded and installed thanks to this video and to you for guiding me to it. Cheers!
  15. Physics Painter HDA

    Hi Noobini (LOL, love the name)... The only thing that pops up in the filter when I start to type "phys" is the pig head. I've manually looked through every window, and get the same unfortunate result. By geometry context, is when the network window displays "geometry" in the top right corner of the window, correct? Sorry for the question, but I'm still just new enough to this all that I don't want to make any assumptions. Insofar, it's the only place that has anything to do with "Paint" (ie., Volume Paint...) but I don't see the physics painter anywhere. I checked the sideFX site and verified that H17 is on the latest build (0.416).
  16. Physics Painter HDA

    Thanks Sepu. I'd already been to that page and my confusion was with how to find and install it from there. In any case, according to the reply by Noobini it's already a part of Houdini 17. I appreciate the help nonetheless.
  17. Random Scale of Spheres

    Thanks Symek, that fixed it. I've only been learning code & scripting for a little while, but long enough that I should've caught that syntactical error sooner.
  18. Hi, I'm trying to randomize the uniform scale of some spheres which are being copied to points. However, nothing I've tried is working. The best result is using a transform node, but all the spheres merely scale to the first parameter and ignore any type of randomization. The attached file currently has an app wrangle using some vex to randomize pscale that was defined in an att created node, but it's throwing errors I don't understand how to fix. Thanks in advance... wk5_terrain-02.hipnc