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  1. Hi, OK my scene is roughly a PDG setup with some work items, those have all been merged together into a single work item where all the attributes are merged into arrays. I am looking to access those attributes using component syntax ( @pdgoutput.1 or @pdgoutput.2 ). This works when I m...
  2. I want to know if a group exists in my geo stream. Found a solution in this old topic but doesnt seem to work Any ideas? check_for_group.hip
  3. Did I do something wrong here? Getting a "Read only expression on left side of assignment" error... could someone help me solve it.
  4. Hi guys, I was watching John Moncriefs rock generator talk and I cannot work out the expressions used in the mountain offset to generate random iterations (around 11 mins). There are some really helpful breakdowns in the comments however I cannot get it to work. I've attached a scene...
  5. Hello! I am trying to implement python expressin in Object Merge node in parm "objectpath1" to get geometry from connected nodes to parent geo. So as final result if you connect/disconnect first input of test node geometry should switch to another one. Actually script working fine and storke...
  6. Hi all I am currently working on a feasibility test in order to build up some understanding of procedural modelling, I have a question regarding expressions in Houdini today, I have received great help from artists in the community which I am very grateful for, thus has helped me get this far,...
  7. Hi guys, I am trying to automate my alembic imports by using a string replace on my File path. For example: on my alembic File Name parameter I've written the expression - `strreplace($HIP, "home/fx", "fx/waterfountain_v001")`.abc I would like to be able to replace the version number with a wild...
  8. Hey Guys, i got a question. I got a vellum sim and i am emitting every 8th Frame one sphere into my sim. I did it with -> $FF % 8 == 1 but now i want that emission just between Frame 1 - Frame 48. So between F1 and F48 i want every 8th Frame an emission. How can i get this...
  9. Hey all, I've been trying to learn more about how loops work, right now I've got a faerie, its wings are expression driven (Sin function tied to a controller) and I have the main build in one shelf with a point cloud that it's instanced to in another. I needed to figure out how to random...
  10. To create a round fencing around house, every cube is aligned in same direction, how can we make to face towards the inner circle like real fence...????
  11. Hi, I am studying python to set a parameter of string (cachePath) by script. After executing the code, ideally it pastes original, "`chs("resouceA")`_`chs("resouceB")`", instead of expanded result "G:/Projects/RnD_000_001/geo_element " So far, I am thinking two methods: A a = r(\"\`ch...
  12. Hi everybody, I have one question I'm creating procedural stairs so I have created an attribute name(Steps) and another is (NumPillar), so what I want is, in edit Parameter Interface we can set range but I want the max range should be same as steps value as you can see in image. Blue color...
  13. Hello, i trying to do something simple but i am knid of new to houdini so i dont know the tricks yet. i have a float number in a for loop that i want to divide by two every iteration. What is the appropriate expression for that?
  14. Hi just wondering if any one could give me any advice on how to write an expression which would set the gravity to 1 for the first 30 frames, back to 0 for until 180 where i would turn back on. At the moment i have if($FF >= 30,0,1) which sets the first 30 frames to active but I'm struggling with re...
  15. Hey, I got a very Basic questin regarding an Expression. So this one: point(stamps("../applyrel1", "SOPPATH", ""), ch("ptgroup"), "P", 1) I´m kinda wondering where "ch("ptgroup") Points to. Ist aiming to a Group Expression Node which contains two Points. But I cant see any actual ch...
  16. Hi, I've tried to cache out .obj files which have the same naming as their import counterparts. I managed to write their original name into a string detail attribute (for example "one200_300-236-58_korpus.obj") - next I thought I could reference those attributes in a filecache node ($HIP/`deta...
  17. I want to get number rounding to the second decimal place. like this -1.2345 -> -1.23 i was do that in Houdini 16.0 : But I cant do that in Houdini 16.5 how can I? sorry, I did not write that I used it Font node. i'd like to use this on Font node....
  18. Hi, I constraint two objects together with chops. Everything works until I use expressions in my parent object. What do I have to do to fetch expression values into chops? kind regards Jon express_chop.hip
  19. hi I was trying to use Sopsolver expression to output the previous timestep, but i am not getting the result. this is the expression i use inside sopnetwork using object merge node. stamps("../OUT", "DATAPATH", "../../.:agents/Geometry") flocking_system.hipnc
  20. I've been working on trying to simplify how I can make tear drop shapes (bombs, fuselages, etc). So I got most of it figured, until I stumbled on losing a point during the copy sop. Im always missing the last point from my ramp. Any help would be appreciated. I find myself fighting my...
  21. Hi guys, As i have pre-roll in my simulation, i am starting my sim from 1000th frame. but this is creating a problem, when i am using the "$F" , because i know it is recognising as frame 1. so that is the help i am looking forward here. how do i fix that ?? i want this $F to be the 1000th...
  22. I'm trying to drive a BlendShapes' SOP blend parameter using a point attribute, @fade. The @fade is a point attribute and have it's value animated. But the blend parameter doesn't appear to read this animated values and keep showing 0 instead. The question: the blend parameter doesn't...
  23. Hey, I got a really stupid question but I can't get it to work ATM. I want to put an expression in e.g. a fluid source node in dops. Something like "if($FF)<225, 1, 0)". So when smaller than frame 225 take 1, else 0 (or another expression like a sin curve). What am I missing here?
  24. I'm using Houdini to render point clouds from depth images, and have everything working for a single frame, but can't get it to evaluate each frame in a sequence. I'm using an expression in the parameter that reads in my image files, so the file path looks like this: D:/UNREAL_WORKING/Brush_VR/...
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