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Technical Discussion » Unreliable Curve Sop nodes

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sanostol
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I have to often nodes, that fail on scene load, for example curve Sop nodes. they then have no curve information stored.
That is quite annoying, as there is no way to see it when saving the scene and one have to find a backup with a correct node.

Does this look familiar to You?

Load warnings for //hades/p/_projekte/TRW/300_work3D/fx/102/020/065/Wind/TRW_fx_102_020_065.Wind_sim_v002.mma.h19.5.hip

Warning:     

/obj/curves_source/curve1:

              GeometryIO: Unable to read magic number (empty file)
              GeometryIO: Unable to read magic number (empty file)
             

/obj/curves_sim/curve4:

              GeometryIO: Unable to read magic number (empty file)
              GeometryIO: Unable to read magic number (empty file)
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Houdini Lounge » Sending rigged character to Unreal Engine?

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sanostol
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It would be a great feature. The way You can rig in Houdini is way to good not to use it.
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Houdini Lounge » Sending rigged character to Unreal Engine?

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sanostol
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Hello

in short You need a functional hda of Your character and the unreal engine plugin working in unreal.

The creation of a hda is well documented, You can find a lot of information about in the documentation or more character specific here: https://www.sidefx.com/tutorials/kinefx-rigging-fur-dude/ [www.sidefx.com]

The installation of the engine plugin is covered here: https://www.sidefx.com/docs/unreal/_getting_started.html [www.sidefx.com]

this should get You started. But for characters unfortunately You won't get usable view port handles for Your character controllers as this is not supported. I tried it with unreal and Maya but no luck.

I asked sidefx for this and they might look into this, as for now it is not possible.

It would open a hole knew world of collaboration if we could rig in Houdini and get animators in Maya to work with these rigs, as, at least in my experience, most animators want to work in Maya for many reasons. anim bot (https://animbot.ca/home/) is just one of them
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Houdini Lounge » Thoughts on NeuralVDB/AI Simulation Tech

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sanostol
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orr
I agree, it would be nice for Houdini not to lose its eye on innovation.


hahaha, You made my day. Oh, wait, You mean that seriously.
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Technical Discussion » Muscle Constaints, Muscle to Bones

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sanostol
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Hello,
I try to use the the new muscle sops and to get the muscles more attached to the bones I tried to increase the "tangent stiffness" in the "Muscle Constraint Properties Vellum" sop but it seems to have no effect. I think internally it uses the attach constraint, but it behaves not the same way, as it does in the standard vellum solver.

quick demo file is attached, and the version is 19.5.534
thank You
Image Not Found
Edited by sanostol - March 29, 2023 09:07:00
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Houdini Engine for Maya » kinefx rigpose handles in maya

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sanostol
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Hello,

is it possible to get the kinefx rigpose handles to work in maya? All tests so far had no success. Tthe parameters are visible and working, but not the handles in the viewport. I guess this is a limitation, but it would be good to know for sure that I did not simply miss some steps.
The handles show up and are working, when I load the asset in Houdini.
To have them working in Maya would be a huge advantage, as most animators are used to Maya and there are a lot of tools they don't want to give up ( animbot for example ).

If this is not implemented yet, I wonder if it is on Sidefx list already.
You thoughts are highly appreciated.

Martin
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Technical Discussion » KineFX - can't select control geometry

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sanostol
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Did You expose the rigpose parameters to a digital asset interface?
And did You modify the default state of Your rig asset to "kinefx__rigpose" int the digital asset properties?
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Solaris and Karma » Instances and lights, how to control the individual lights

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sanostol
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I thought way too complicated... it just work

so just for completeness and someone else is looking for it, I attached a hip
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Solaris and Karma » Instances and lights, how to control the individual lights

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sanostol
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hello,
is it possible to instance lights (references) and control the light properties per instance?
I tried light filters, but I hit the wall when I tried to import primvars in the lightfilterlibrary context
For one part the usd primvar node is not available in that context and a copied node has no effect.
Should it work at all?

thank You
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Solaris and Karma » render delegate selection in husk

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sanostol
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just for completeness, packages do work with husk.
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Solaris and Karma » render delegate selection in husk

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sanostol
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Hi Michal,
thank You a lot for Your help.
I completely forgot the houdini.env file. I switched to packages some time ago.

With the houdini.env file it works now, with two errors, do You get them as well?
  • Can't open dophints.cmd
  • Unable to find procedural invoking script: python3.7libs/husd/runprocedurals.py

I will have to check how to reproduce that with a batch file, but it helps a lot.
Martin
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Solaris and Karma » render delegate selection in husk

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sanostol
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hello Michal,
how did You setup the environment variables for Your cmd?
I tried to do it the same way as I start Houdini to use Arnold. I use a batch to set $PATH and $HOUDINI_PATH and start Houdini, but this does not work with Husk for me, either Arnold is not found by Husk or the $HOUDINI_PATH seems to be not correct, as some other tools are not loaded correctly. Would be great if You could tell me more about how You set up the environment to get Arnold with Husk in a cmd

thanks a lot
Martin
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Technical Discussion » Submit job from different HoudiniFX version to the farm

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sanostol
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rhe farm needs the correct version, I guess. You can open files with created by a lower version, but most of the time there are some error messages, probably these will break the process
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Technical Discussion » Hide static object in dopnet from rendering

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sanostol
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It is a good idea to import the dop objects back into sop level to render. there You can apply materials and You have finer control what You want to render.
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Technical Discussion » Objects Fractured to Its Own Pieces

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sanostol
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Hello, every object part, You decide to be independent in a bullet sim, You have to put a unique name attribute on it.
easy example for a input geometry that has some unconnected parts would be

- connectivity SOP
connectivity type = primitive,attribute = "name", attribute type = string and prefix = something like "pie
this creates a unique name name attribute for all independent islands

- assembly SOP
create name attribute = off, create packed primitives = on
this packs all primitives with the same name attribute in one packed geometry, and promotes the name attribute to the point level

now You have a valid geometry for simulation in bullet solver ( most of the time You want to use this one)
very small or very thin elements will give You troubles so better avoid them, so Your geometry is not ideal for this one better give them a thickness as well, not only flat prims
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Technical Discussion » How do I know what frame to start and end of alembic?

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sanostol
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You can middele click on the node in the networkview

or if You need it automated:

import _alembic_hom_extensions as abc
time_range = abc.alembicTimeRange(archive_path)
start_frame = timerange[0]*hou.fps()
end_frame = timerange[1]*hou.fps()
the values are the actual samples, so if You have motion samples they have a additional step
Edited by sanostol - Nov. 30, 2022 05:12:10
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Houdini Lounge » AMD GPU owners, what has been your experience?

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sanostol
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I wonder if the new cards with their chiplet design still count as one gpu unit in opencl context
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Technical Discussion » Directly rendering .usd file with USD Render ROP

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sanostol
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Hello, You can write a usd that has all the rendersettings and targets definded and then You can use husk to render this usd directly. If You want to speed up the process to write out the usd file You can split up the usd, for example one contains a vdb sequence, this will take some time or instances. all this geometry sequences get their own usd files and in the render usd all the usd files get loaded instead of the geometries. no when You write the render usd it is super fast, as all the heavy work is already done
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Technical Discussion » Python inside locked HDA that create chop nodes doesn't work

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sanostol
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Hello, You could create a subnet inside Your hda and set this node to be editable in the hda settings. even if the asst is locked,the user can jump into this node and can create nodes or edit. A python script also can modify this network
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Technical Discussion » Trying to create trails through particles

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sanostol
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in the trailSop change the result type to "preserve original". the addSop connects the points later by id
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