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Sue-Mari Sauer avatar image
Sue-Mari Sauer asked ·

Hey all, Quick Question. Does the hair shader for arnold work on standins?

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Ashley Handscomb Retallack avatar image
Ashley Handscomb Retallack answered ·

This looks like differnce in either render colorspace or the View transform of the render viewer between MtoA and houdini.

What colorspace are you rendereing in? If you save out an .exr and view it in a the same application, do you still get a diffeernce?

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Not sure if you saw my responce last week? But I think its color space. Is there a way to match houdini and mayas colorspaces?

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Sue-Mari Sauer avatar image
Sue-Mari Sauer answered ·
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Ashley Handscomb Retallack avatar image
Ashley Handscomb Retallack answered ·

What is the colorspace of the textures? The colorspace of the file node in Maya?

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there are no texure maps assigned. Its just a shader with a brown color on it.

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Sue-Mari Sauer avatar image
Sue-Mari Sauer answered ·

Maya color space:

Houdini color space?


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image-2.png (17.3 KiB)
houdinicolor.png (129.6 KiB)
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Sue-Mari Sauer avatar image
Sue-Mari Sauer answered ·

So top left sphere is Houdini .exr viewed in rv. Bottom left sphere is Maya render of same sphere in rv. Right big sphere is Houdini .exr render viewed in Maya renderviewer. So as you guys can see the Houdini .exr displays the same as Houdini render view in the Maya renderview. It doesn't change to look like the maya render.


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Sue-Mari Sauer avatar image
Sue-Mari Sauer answered ·

Will look into that now thanks Ashley, also so everybody knows I am doing a test to see if a Standard surface shader comes across correctly on the fur

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Sue-Mari Sauer avatar image
Sue-Mari Sauer answered ·

render setting are the same both sides too


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Rik Dl avatar image
Rik Dl answered ·

is your amount of rays and samples the same?
A higher amount of spec samples and especially spec rays will intensify the spec on the hair.


But based on the look of the 2 renders, the one from maya looks the most correct one based on my experience with the aistandardhair. So maybe check your colormanagement in houdini as well

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Sue-Mari Sauer avatar image
Sue-Mari Sauer answered ·

So I checked that only the fur is in the standin.
Im using the hair shader from houdini in maya(exact same shader)
Only have a white skydomelight in both houdini and maya(same lights)
Have the same version of Arnold

Looks like the Spec is the problem.


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diffuse-ind.png (556.3 KiB)
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Stephen Blair avatar image
Stephen Blair answered ·

Assuming you have the same version of Arnold on both computers, you're going to have the same shader on the curves.

But in Maya, you're also applying that hair shader to any geometry that might be in the ass file (if you applying the hair shader to the aiStandin)

Also, lighting may be different. Color management settings too.

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