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Showing results for tags 'Expression'.
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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...
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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
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- expression
- vex
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Did I do something wrong here? Getting a "Read only expression on left side of assignment" error... could someone help me solve it.
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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...
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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...
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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,...
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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...
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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...
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- simulation
- vellum
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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...
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- expression
- loop
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get orient attribute from point normals
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- houdini
- expression
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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...????
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- houdini
- expression
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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...
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- python
- unexpanding
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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?
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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...
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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...
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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 ($HIP/`deta...
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- naming
- file cache
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Hi, I constraint two objects together with chops. Everything works until I use expressions in my parent object. What do I have to do to fetch expression values into chops? kind regards Jon express_chop.hip
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- expression
- chops
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hi I was trying to use Sopsolver expression to output the previous timestep, but i am not getting the result. this is the expression i use inside sopnetwork using object merge node. stamps("../OUT", "DATAPATH", "../../.:agents/Geometry") flocking_system.hipnc
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I've been working on trying to simplify how I can make tear drop shapes (bombs, fuselages, etc). So I got most of it figured, until I stumbled on losing a point during the copy sop. Im always missing the last point from my ramp. Any help would be appreciated. I find myself fighting my...
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Hi guys, As i have pre-roll in my simulation, i am starting my sim from 1000th frame. but this is creating a problem, when i am using the "$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...
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- $f
- frame change
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I'm trying to drive a BlendShapes' SOP blend parameter using a point attribute, @fade. The @fade is a point attribute and have it's value animated. But the blend parameter doesn't appear to read this animated values and keep showing 0 instead. The question: the blend parameter doesn't...
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- expression
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Hey, I got a really stupid question but I can't get it to work ATM. I want to put an expression in e.g. a fluid source node in dops. Something like "if($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?