I Ray gloss.

cclesue

I recently ran some tests in the IRay renderer of old stuff for Vicky. A clothing items came ou looking like the had a shiny plastic overcoat. I'm new to this IRay stuff an know that there differences. I just don't understand what theya re. I like the textures on the items I tested and have no desired to go to all the trouble of retexturing them. What am I missing. I'm so confused.

zombietaggerung

If you're just applying the default Iray Uber Base shader you usually have to turn up the "Glossy Roughness" setting. At least .5 will get rid of that ridiculous shiny effect.

RobotHeadArt

Are you applying the Iray Uber Base shader to the items before rendering?  If you do not do this step, the materials will automatically get the Iray Uber Base shader applied as a pre-render step.  When the Iray Uber Base shader is applied to an item, it will attempt to convert the values as best it can and move the texture maps to the new surface settings.  The older clothing items may have been originally setup up for Poser 6's or older's render engine which expects some very different ranges of values for gloss than what Iray expects so the conversion is not optimal.  What you will want to do is apply the Iray Uber Base shader and manually adjust the maps and gloss values or get a shader library that has conversion tools that automate the process.

If you are manually adjusting the gloss values, you will want to look at Glossy Layered Weight, Glossy Color, Glossy Reflectivity, Glossy Roughness.

If you want a product to help automating fixing the settings while keeping the original texture maps, I recommend Pd Iray Shader Kit 2 and Convert It! by vyktohria sold at Rendo.

kaotkbliss

First thing I usually try is changing the lighting model from plastic to matte in the surface tab of the shiny object. Usually that works well enough.

cclesue

Kaotkbliss?

How do I do this? I thought I could figure it out but no joy as of this morning. Where is the surface tab to change?

kaotkbliss

select the item that's rendering shiny and click on the surfaces tab

The setting should be right at the top or at the very bottom of the surface settings list (I've seen it in both places)

You'll know the setting when you see it because the option will say "plastic"

Just click on that and more options will drop down such as matte, metal, rubber, etc.

Oso3D

That reminds me... sometimes when I convert Iray to 3DL, gloss translates mostly right. Many times it doesn't. Anyone know why? I should test that.

 

Oso3D

Hmm. I can't replicate that. The only time settings are preserved seems to be with UberSurfaces, which preserve base color (unlike Daz regular shader)

So, yeah, we could really use a script or something to convert. If I knew scripting at all I'd try it.

cclesue

How do I turn up the "Glossy Roughness" setting in the default Iray Uber Base shader. 

Oso3D

Not sure what you mean... you move the slider?

 

Pack58

cclesue said:

Kaotkbliss?

How do I do this? I thought I could figure it out but no joy as of this morning. Where is the surface tab to change?

This is where the Lighting Model settings are but I'm not sure how they apply in this case because I think they are only for Daz 3DL default shaders.

EDIT LOL Lost the screenshot showing Glossy Roughness. Will redo and post.

The Glossy Roughness slider (and the others in the second image) will only show if you have IRay shaders applied.

cclesue

I understand using the surface tool and the revealed dialog. It's the "Glossy Roughness" I can't find.

I'm refering to Zombies post: "If you're just applying the default Iray Uber Base shader you usually have to turn up the "Glossy Roughness" setting. At least .5 will get rid of that ridiculous shiny effect."  So I being the duffus I is I can't find said "Glossy roughness" setting.

 

Richard Haseltine

Do you have the Iray Uber Bse sahder applied? If you just use the item as loaded it will be using a 3delight shader - probably the Default Daz Shader - with DS temporarily applying the Iray shader at render time; if you want to make changes you need to explicitly apply the Iray shader.

cclesue

I guess I'm still not understanding what I need to do. I have applied to each of the items the Uber base shader as indicated now I want to know how and where is the   "Glossy Roughness" refered to by zombie. It's there but I'm not seeing it. What do I have to do to access it?

Taoz

Remember to select the item under both the Scene tab and the Surfaces tab, otherwise the shader will not apply.

DustRider

If you applied the Iray uber base properly, the Base Mixing Mode will typically be "PBR Matalicity/Roughness" (see top portion of the attached image), but if the mixing mode does not have "PBR" in it, you probably haven't applied the shader properly (you need to make sure you have the item you are applying the Iray Uber Base shader to in the Scene pane, the the material zone(s) selected in the surfaces pane). Glossy Roughness with show up below Glossy Reflectivity (see the bottom portion of the attached image).

cclesue

The shaders are applying. I have before and after renders after I applied the "matte" surface. 

Wshat I'm trying to discover is where and how do I access the  "Glossy Roughness" dialog?

 

Taoz

cclesue said:

The shaders are applying. I have before and after renders after I applied the "matte" surface. 

Wshat I'm trying to discover is where and how do I access the  "Glossy Roughness" dialog?

Surface tab. See Pack58's 2nd screenshot above

SpottedKitty

I just spent five minutes going round and round in circles in the online D|S documentation trying to get at any actual documentation pages; I'd forgotten just how incredibly unwieldy and unusable the whole thing is, especially in its current not even half-finished form.

Something that might be getting forgotten is that many of the Surfaces parameters in Iray are visible or not depending on other parameters settings. Here's what the docs have to say:

• Glossiness - This property is the inverse of Glossy Roughness. In this case, the higher the number the the more sharp the highlight becomes.
  
  This property shows in the PBR Specular/Glossiness mode of the shader.

• Glossy Roughness - The property controls the roughness of the surface. The higher the value, the less shine the surface will have. It can also be mapped with an image map to drive its strength.
  
  This setting is essentially one of the only glossy channels that matters when using Metallicity. When set to any value other than 0, this opens up two more properties - Glossy Anisotropy and Glossy Anisotropy Rotations.
  
  This property exists in the PBR Metallicity/Roughness and Weighted modes of the shader.

So, if I'm reading this right, the relevant parameter is either Glossiness or Glossy Roughness, depending on which shader mode is set.