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Rendering with Arnold in Houdini and Solaris using the HtoA plug-in.
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Arnold shader nodes not showing in Houdini

Message 1 of 14
2529 Views, 13 Replies

Arnold shader nodes not showing in Houdini

01_img.pngI'm trying to create a basic material, I can create the Arnold Shader Network but if I dive into it there is no Standard surface nor any other shader.

I guess the Env. file is set up correctly since the Arnold tab is present, so I don't understand what I'm doing wrong.

I'll attach a picture, thanks in advance for the help.

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Message 2 of 14
in reply to: willibarret2000


Can you share your environment with us? Go to Help / About Houdini / Show Details, press Save and share the resulting file.



Message 3 of 14


the same problem

Message 4 of 14

How do you start Houdini? Start it from the Houdini Command Line Tools, don't double click on a hip file.

// Stephen Blair
// Arnold Renderer Support
Message 5 of 14

This is my problem8022-1598221686457.png

Message 6 of 14
in reply to: willibarret2000


I think I found your issue. Looking at the env file, I noticed that the HTOA folders are present twice both in PATH and HOUDINI_PATH, and doing the same thing locally broke my shaders.

You can try the following:

Locate your houdini.env file (should be in C:\Users\pablo\Documents\houdini18.0) and make sure the PATH and HOUDINI_PATH contains the HTOA folders only once.

It should look like if you are using the HtoA installer:

# htoa config start

PATH = "$PATH;C:/Users/pablo/htoa/htoa-5.3.0_r233605f_houdini-18.0.499/htoa-5.3.0_r233605f_houdini-${HOUDINI_VERSION}/scripts/bin"

HOUDINI_PATH = "C:/Users/pablo/htoa/htoa-5.3.0_r233605f_houdini-18.0.499/htoa-5.3.0_r233605f_houdini-${HOUDINI_VERSION};&"

# htoa config end

After this, go to control panel / system / advanced system settings / environment variables and make sure PATH or HOUDINI_PATH does not contain any htoa specific folders there. (and logout/login if you do remove something from there)

After all this, reopen Houdini and the shader nodes should be visible again.

Please let me know if this works for you.


It seems that having HtoA twice in HOUDINI_PATH is the culprit. (same thing happens with HtoA 5.4)

Message 7 of 14

If you double-click a hip file, that runs a different executable (eg on Windows, hview), and the environment is set differently (with the two entries that cause the problem)

// Stephen Blair
// Arnold Renderer Support
Message 8 of 14

How I can start Houdini with Houdini Command Line Tools step by step ??

Message 9 of 14
in reply to: pal.mezei

It doesnt work for me 😞

Message 10 of 14

It's in the Windows Start menu, under Side Effects Software > Houdini > Utilities

Then run houdini or houdinifx or hindie

// Stephen Blair
// Arnold Renderer Support
Message 11 of 14

Stephen that was the problem, SUCCESS!!!!!!!!! I`m very happy 🙂


Message 12 of 14

I have the same problem, I have tried everything and nothing works. I'm going crazy, I've been trying for a week. It's a very expensive product to have so many problems.

Message 13 of 14
in reply to: Stephen.Blair



is there a way to change the env that is used by houdini when double-click on a file?


Message 14 of 14
in reply to: willibarret2000

okay , so i removed one of the 2 path :


and now it work , i can double click scenes and there is arnold nodes, i just try a bit, i don't know if this will cause other problem later, i hope this is the solution !

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