OSL issue in Houdini

Anonymous

OSL issue in Houdini

Anonymous
Not applicable

Hi,


I have an issue with OSL shading in Houdini Solaris(18.5.499) using (HtoA 5.6.0.2).

I have written the below OSL shader. This works perfectly fine in Maya (MtoA 4.2.1.1), but when setting up the EXACT same shader network in Houdini the OSL part of it does not work. It doesn't seem to reading the "input" properly like it does in Maya.


It is definitely the OSL part of the shading network that is causing an issue, because I have tested WITHOUT the OSL shader in Maya and Houdini and then I get the same result. Only when I plug in the OSL shader does it stop working properly in Houdini.


1. Is there any reason why this shouldn't work in Houdini Solaris?

2. What can I do to make it work in Solaris or is this a bug?



OSL shader (same in Houdini and Maya).

1614550210851.png


Houdini Shader Network:

1614551169065.png


Houdini result:

1614551196217.png



Maya shader network and result:

1614551117468.png





Maya(left) and Houdini(right) result without OSL shader, just with aiUtility and Random (which I want to plug into OSL input):

1614552834101.png



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Replies (13)

madsd
Advisor
Advisor

Not known for certain why this bugs out.
I wrote a new node that does not need the Arnold utility or the random nodes and instead just wrote the functionalities needed directly into the OSL node ( less noodle chaos )

Added a seed in the UI.

Try it and see if its better.
If it works, you can just move the stuff you need UI access to into the UI area of the code.

qwe.png


shader probabilitymix
(
    int Seed = 42,
    output color Out = 0,
)
{    int Hash;
    string Name = "theThing(tm)";
    getattribute("nodeName", Name);    
    Hash = hash(Name);
    
    float ratio = noise("cell", vector(abs(Hash), abs(Seed), 11)); 
    Out = mix(0,1, ratio);
    
    vector a = vector (1,0,0);
    vector b = vector (0,1,0);
    ratio < 0.5 ? Out = a : Out = b; 
}


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Anonymous
Not applicable

Hey!


Thanks for taking a look at this!

I tried putting your OSL code into my Solaris scene and I am not getting the same result as you unfortunately. Still only a block of colours. If I have the seed set to anything below 1.0 it turn red like below and if the value is 1.0 and over it turn green.


Houdini result of Mads code:

1614594267937.png



Also I tried your code in Maya and not getting the same result as you in 3Ds Max?


Maya result of Mads code:

1614594320878.png





OSL should evaluate the same no matter the software?


Thanks,



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madsd
Advisor
Advisor

I am not happy to hear that this isn't working.
It can then only be because Maya and Houdini is not on par with the OSL specifications.

getattribute("nodeName",something);
SHOULD be a generic construct, not a max thing IIRC.

It also worries me that your original shader doesnt work as it is super generic code, so I think its a case of OSL not really being mature enough in either of those hosts, or in your concrete case, Houdini.

I wont be able to move further, so wait for an Arnold/Houdini dev to come around and probe your concrete case.

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madsd
Advisor
Advisor

oh, just need to ask, those boxes are instances right? not 1 mesh with x number of elements?

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pal.mezei
Advocate
Advocate

Hi Klaus!

I was able to reproduce your issue. It seems that connections to inline OSL nodes are not correctly interpreted in Solaris. I'm still looking for the root cause, so no idea what's going on exactly, but I'll let you know once I have a solution.

Cheers,

Pal.

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Anonymous
Not applicable

Okay that is great news. I feel like this was working in a previous version, as the above OSL have been used on some of our furry creatures before. But now in 18.5 it has stopped working.


Regarding a fix for this in the short term do you have any solution? This has messed with our furShader quite a bit.


Thank you,

Klaus

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madsd
Advisor
Advisor

You could build a small Arnold core node rig that does the filtering.

Where the Compare node in "math" would do it for your 2 conditions.




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pal.mezei
Advocate
Advocate

This is an issue with our shader translator (that translates Arnold shaders to the USD stage in Solaris). It's not something you can fix on your side without modifying the shader translator.

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Anonymous
Not applicable

I created one box and just duplicated it.

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Anonymous
Not applicable

Thanks for your help anyway.. much appreciated!

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pal.mezei
Advocate
Advocate

Hi Klaus!


I have a local solution that fixes your issue, but I'm still investigating the best way to integrate it into HtoA.


For a short-term solution, I attached the updated version of the Arnold shader translator, arnold.py.zip. Just extract the "arnold.py" file inside, and replace "scripts/python/husdshadertranslators/arnold.py" inside your htoa installation.


Cheers,

Pal.

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Anonymous
Not applicable

Hey!


I finally got around to test this today. This solution works and our OSL shader works once again!


As this is a local fix, when can we expect a fix for this in the normal release? Is this something that would just be automatically fixed in the next release?


Thanks a lot for the help!

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pal.mezei
Advocate
Advocate

Hey!


Yes, correct, we already have a fix (though a different approach) for this issue in our release branch.


Cheers,

Pal.

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We use StackAdapt to deploy digital advertising on sites supported by StackAdapt. Ads are based on both StackAdapt data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that StackAdapt has collected from you. We use the data that we provide to StackAdapt to better customize your digital advertising experience and present you with more relevant ads. StackAdapt Privacy Policy
The Trade Desk
We use The Trade Desk to deploy digital advertising on sites supported by The Trade Desk. Ads are based on both The Trade Desk data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that The Trade Desk has collected from you. We use the data that we provide to The Trade Desk to better customize your digital advertising experience and present you with more relevant ads. The Trade Desk Privacy Policy
RollWorks
We use RollWorks to deploy digital advertising on sites supported by RollWorks. Ads are based on both RollWorks data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that RollWorks has collected from you. We use the data that we provide to RollWorks to better customize your digital advertising experience and present you with more relevant ads. RollWorks Privacy Policy

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We can access your data only if you select "yes" for the categories on the previous screen. This lets us tailor our marketing so that it's more relevant for you. You can change your settings at any time by visiting our privacy statement

Your experience. Your choice.

We care about your privacy. The data we collect helps us understand how you use our products, what information you might be interested in, and what we can improve to make your engagement with Autodesk more rewarding.

May we collect and use your data to tailor your experience?

Explore the benefits of a customized experience by managing your privacy settings for this site or visit our Privacy Statement to learn more about your options.