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The Iray uber Shader will be applied to surfaces without Iray shaders as part of the preparation to render - the result will be the same, for good or ill, as just applying the base shader. Surfaces for which that doesn't work should ahve the shader applied manually and then settings tweaked.
I don't think it's the Uber shader that's automatically applied with the just-in-time conversion; I think it's a more rudimentary conversion to an MTL-compatible surface. It's hard to know just looking from the outside, but in my tests I've gotten some different visual results between the JIT conversion and applying the default Uber shader.
All I know is that only some of the things will appear when rendering in iray. Scenes appear blank and I am guessing by the draw settings that this is because they do not have the right properties to render.
I think I'm going to hit Youtube to see if the community have made any good videos to help me get started.
100% agreed. The results will definitely will be the same. If you are looking for videos on this, check out Vimeo as well. Sometimes they have some awesome tutorials that you can't find on Youtube.
It might also be a lighting problem — a scene lit for 3Delight might or might not have its lights convert properly into Iray. Remember the two render engines are very different, not just in the way they handle materials. Some 3Delight lights will not work at all in Iray, you will have to re-light the scene.
The other gotcha about not applying the Iray Uber shader is that you have no real control of what comes out in the render. It's just not practical to tweak 3Delight materials and know for sure what sort of auto-conversion that change will render as. If you apply the Iray Uber shader, then you have the Iray materials parameters right there, and can tweak them in between test renders to get exactly the effect you want.
It is the Uber Shader, Richard is correct.
Note that applying the shader will save time at the start of a render, so it isn't a bad idea, just not a necessary one.
If scenes are appearing blank then it's not just an Iray shader issue. Even unconverted textures should be visible with Iray. I agree with SpottedKitty above that you have a problem with lighting. Either the wrong lighting or a light obscured by something.
I watched a video the other day from the store (5.1 Great Art Now - Lighting) and found the tip about changing the maximum value of the lights so they can be brighter.
From what I am guessing, if the lights have no lumen value they wont appear in Iray. Somehow I have lights in my scenes with only an intesity value and no lumen value. I've deleted those and replaced them with new ones.
The problem that I have with Uber or the automatic application is that some surfaces come out glossy when they aren't supposedd to be. If I'm in a hurry, I just add the rubber-matte shader to those areas to remove the shine.
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