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Technical Discussion » Viewing CHOPs audio channel with keyframe parm ?


nicholas_yue: 301 posts; Offline

June 26, 2022 21:04:51

I am able to pin the parm channel but I can't seems to get a channel from the CHOP to show up for me to pin on the left.

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Technical Discussion » Viewing CHOPs audio channel with keyframe parm ?


nicholas_yue: 301 posts; Offline

June 26, 2022 20:51:59

Hi,

I am able to view the keyframe channel values of my parm

I would like to look at them in context with an audio CHOPs I created.

I am troubleshooting some timing/drift issue and was hoping to view them together to better understand the underlying issue.

So my question is, is there a way to view parm animation channel with CHOPs audio channel in the same timeline graph where we can pan and zoom both channels synchronously for debugging?

Cheers

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Technical Discussion » ARM build of Houdini ?


nicholas_yue: 301 posts; Offline

June 19, 2022 01:36:42

Now that there is an Apple Silicon build of Houdini, are there possibility of an ARM (Linux/Windows) build of Houdini ?

I have been following the HPC application on AWS Graviton 3 CPU and wondering if those architecture may boost Mantra/Solaris renders performance.

Cheers

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Technical Discussion » Houdini 19 and Ubuntu 22.04


nicholas_yue: 301 posts; Offline

April 21, 2022 19:45:54

Experimentally install H19 on a Ubuntu 22.04 and got this.

Just running hkey

```
Warning: Ignoring XDG_SESSION_TYPE=wayland on Gnome. Use QT_QPA_PLATFORM=wayland to run on Wayland anyway.
qt.qpa.plugin: Could not load the Qt platform plugin "wayland" in "" even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Available platform plugins are: eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, wayland-egl, wayland, wayland-xcomposite-egl, wayland-xcomposite-glx, webgl, xcb.

Aborted (core dumped)
```

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Houdini Indie and Apprentice » glTF export : Available to Indie ?


nicholas_yue: 301 posts; Offline

Oct. 30, 2021 16:21:45

I tried with both H18.5 and H19.0

All I get is a file containing the following

{
	"asset":{
		"version":"2.0",
		"generator":"Houdini GLTF 2.0 Exporter"
	}
}

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Houdini Indie and Apprentice » How to add color ramp to volume for render in Mantra ?


nicholas_yue: 301 posts; Offline

Oct. 21, 2021 21:32:09

Hi,

I am bringing in some CAT scan data (16bit) to render in Houdini.

I have already transfer the data to a volume BGEO

It is currently just a grey scale render.

I would like to add some material where I can map the scalar value to some ramp.

What nodes in the Material/VEX-Builder should I consider using to bring in the volumetric scalar data in the BGEO's volume primitive and would I need to use principled material for the color to appear in the Mantra render ?

Image Not Found

Cheers

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Technical Discussion » HDK: PRM generated choice list - persistence question


nicholas_yue: 301 posts; Offline

Sept. 29, 2021 00:29:34

Hi,

I am writing a SOP which is building a choice list base on information it obtains from it's input geometry.

When I create the SOP from a blank scene, it allows me to select a choice from the dynamically built menu list.

However, after saving the file and reloading it in a subsequent Houdini session, the menu item turned green and I can't seems to select other visible options in the menu list. Are there additional step I need to take in the SOP for Houdini to know that certain parameters need to be save to the HIP file ?

https://github.com/nyue/HDKQuestions/blob/main/PRM/ChoiceGenFunc/SOP_ChoiceGenFunc.cpp [github.com]

Cheers

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Technical Discussion » HDK/HOM : Custom param type creation ?


nicholas_yue: 301 posts; Offline

Sept. 22, 2021 19:14:46

My solution at the moment is to use HOUDINI_RAMP_PATH environment variable

The file has to be named rgb.ramp

I can customized the content

Cheers

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Technical Discussion » HDK/HOM : Custom param type creation ?


nicholas_yue: 301 posts; Offline

Sept. 22, 2021 14:35:55

I did have a look at the following

https://www.sidefx.com/docs/houdini/hom/hou/RampParmTemplate.html [www.sidefx.com]

but the constructor didn't indicate the possibility of customising the ramp presets which is something I hope to do with a custom ramp.

I also save the code via asCode() to see if there were some hidden gem but didn't find something that jump out at me.

Cheers

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Technical Discussion » HDK/HOM : Custom param type creation ?


nicholas_yue: 301 posts; Offline

Sept. 22, 2021 13:39:36

Hi,

I am looking at creating some custom param type.

Where in the HDK/HOM should I look into ?

Cheers

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Technical Discussion » Color ramp presets - programmatically creating/adding them ?


nicholas_yue: 301 posts; Offline

Sept. 20, 2021 00:08:30

Hi,

In the color ramp, there are a couple of presets e.g.

Black Body
Grayscale
Infra-Red
Two-Tone
White to Red

I am looking for ways to add more presets programmatically.

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Technical Discussion » VEX color ramp look up


nicholas_yue: 301 posts; Offline

Sept. 19, 2021 13:06:56

Hi,

I am looking at ways to calculate the vertex colour base on certain attributes on the geometry. Those attributes have min and max values which I am using to determine a range.

Currently, I am using the values as RGB for @Cd and it looks to be working so I am looking ahead to a colour ramp.

Building the color lookup in the AttributeWrangler VEX section seems computationally expensive as that gets run over every point.

If using a color ramp outside of the AttributeWrangler, what type of SOP or OP provides an accessible color ramp ?

How would the AttributeWrangler get access to the ramp ? Via the ancillary inputs ?

Or should I write a Custom File SOP with a color ramp so that the AttributeWrangler have access to them ? How would a VEX code looks like which access SOP level color ramp ?

Cheers

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Technical Discussion » Reading geometry's detail in attributewrangler?


nicholas_yue: 301 posts; Offline

Sept. 19, 2021 00:38:58

vector dk = detail("op:/obj/geo1","k");
float pk = point("op:/obj/geo1","k",@ptnum);
//printf("pk = %f\n",pk);
printf("dk = %f, %f\n",dk[0],dk[1]);
float rr = (pk-dk[0])/(dk[1]-dk[0]);
@Cd.r = rr;
@Cd.g = rr;
@Cd.b = rr;

I am trying to read a pair of detail level attribute but I am getting zeros and not those I see in the spreadsheet, what am I doing wrong ? I can see the k and k has values 0 and 16 but my print out says zero.

Thank you.

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Technical Discussion » SOP and Verb - introductory information ?


nicholas_yue: 301 posts; Offline

Sept. 12, 2021 23:50:08

Hi,

Been away from HDK for a couple of years.

Back writing some SOP. I noticed something call Verb within a SOP.

I am hoping someone can direct me to some background of how the Verb came about and some history as to what problems it aims to solve.

Can I still write old-skool SOP without the new Verb thingy?

Cheers

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Technical Discussion » Programmatically selecting camera for viewport in hython


nicholas_yue: 301 posts; Offline

Feb. 12, 2021 17:37:41

I have generate a HIP file scene that has geometry, camera and Mantra node.

How do I set the current camera as the rendering camera ?

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Technical Discussion » Pressing button programmatically in hython ?


nicholas_yue: 301 posts; Offline

Feb. 12, 2021 17:18:28

Answering my own question

camera_geo.parm("buildHierarchy").pressButton()

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Technical Discussion » Pressing button programmatically in hython ?


nicholas_yue: 301 posts; Offline

Feb. 12, 2021 16:44:02

I need to execute the effect of a button press for the following

Build or Update Hierarchy

How can I achieve that in hython ?

Edited by nicholas_yue - Feb. 12, 2021 16:44:53

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Technical Discussion » Alembic hierachy lost


nicholas_yue: 301 posts; Offline

Nov. 6, 2020 18:09:00

Hi,

I have to process (cleaning up) some alembic animated mesh exported from Maya which has a hierarchy.

I am using the Alembic SOP to bring in the file.

When I am done, I am writing out the files via ROP Alembic SOP

(1) I noticed that the files becomes very large (compare to the original input file)
(2) The hierarchy is gone, replaced by names like alembic1_NNN

What Alembic output approach should I use instead to keep the file size in check and also to preserve the hierarchy ?

Cheers

Edited by nicholas_yue - Nov. 6, 2020 18:09:40

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Technical Discussion » Alembic : NURBS surface with trimming curves


nicholas_yue: 301 posts; Offline

Oct. 11, 2020 16:40:53

Hi,

Does Houdini support Alembic NURBS surface with trim curves ?

Cheers

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Technical Discussion » Docker image forthcoming ?


nicholas_yue: 301 posts; Offline

Oct. 2, 2020 13:53:42

Hi,

I see a Docker section in Downloads.

Are these ASWF derived Houdini-as-docker ? Will they be hosted on DockerHub whereby we can point to for CI/CD purposes ?

Hopefully these images will allow headless execution for unit testing.

Cheers

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