Chaos Corona for Cinema 4D > [C4D] I need help!

Disney Specular and IOR

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Sedrax:
Greetings. I wanted to ask you, if you have time for an answer) I am looking into Corona Physical MTL in more detail, namely Specular/IOR modes. And the question is: is Specular something like Reflection in Legacy MTL? Yes, it converts to IOR, but I mean the very principle of use. Also, how exactly to create textures for it? Previously, it was possible to simply make the texture black and white and adjust it by eye. Now we have to take into account that the color range should be up to 0.5, if I want to get an IOR of 1.5, and this complicates the task quite a bit, I don't know how exactly it can be done. And lastly, if there are ready-made textures for Reflection, how exactly do you convert them for Disney Specular? As I understand the textures from Megascans, namely "Specular" - are they made specifically for this mode? Thank you very much.

James Vella:
Its quite a deep topic, but for the sake of simplicity moving forward I would use the Metallic/Roughness method (default for Corona Physical) to be honest.

If you do want to use the Specular method regarding some textures you have on file then just put them into the appropriate material slots. In regards to the IOR you can read an in-depth topic I went into "Down The Rabbit Hole" on how you convert IOR to specular and bake them into your textures.

If you want to learn more about how Specular works I suggest you read the PBR guide (attached for convenience since I cannot find it online anymore - btw its missing pictures since I had to get it off the wayback machine.

Also if you really want you can also use my Bitmap2PBR plugin I made to do all these conversions for you, I made it quite a few years back but for the sake of learning you could use it if it really interests you (its a paid plugin but it converts a diffuse bitmap to PBR, Specular or Roughness or both). I dont use it myself anymore since I just stick with the Metal/Roughness workflow (and I wont be updating the plugin). FYI the plugin only takes a diffuse texture, and/or a metal mask bitmap, nothing else so if that doesnt help I dont suggest buying it.

burnin:
May help clarify few things: "PBR Texture Conversion" (@ Marmoset.co)

Sedrax:
Thank you very much. I will definitely review everything.

Sedrax:
If you use the standard metalness worflow mode, it turns out that you only need a texture for the Base Color, a roughness texture, and relief textures and the like, of course, having decided on the metalness parameter. But if the mirror image is too large, then you just need to numerically reduce the IOR and that's it? I understand it that way. On the other hand, if you turn on the Disney specular mode, you can more accurately emphasize the depth, and more precisely adjust this ability of specularity, and thereby add new details. Is everything correct?
The only thing I haven't fully understood is how to create textures correctly so that Specular does not exceed 0.5 (for example for IOR 1.5), because Specular in Metalness workflow differs from Reflection in Specular Workflow, as a minimum by the values ​​are converted to IOR and should be fairly accurate. Not using Substance, is there an alternative to creating this exact texture for the Disney Specular mode in Corona Physical? and is it possible to create it from an existing texture for Reflection or Diffuse/Albedo, but in 3d Max itself, for example, in the process of work? Without using third-party programs?

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