specular index?

[amtberg]

Brand new to Octane and the C4D plugin, but it looks to me like the specular material's "index" channel is meant to set the material's refractive index. As such one would expect a value of around 1.5 to be correct for glass, but it renders completely wrong. The correct setting for material glass appears to be between 0.75 and 0.8. Or am I missing something?

[FooZe]

Hi Amtberg,

You are correct the IOR for glass should be 1.5 (or there abouts).
Can you post some screenshots so we can see what is going on?

Thanks
Chris.

[bepeg4d]

the specular material is the most powerful shader in octane, but has some things must be known in order to use it with all the kernels.
in the attribute editor of specular material, activate the option in the "fake shadow" tab.
in the kernel settings, remember to activate the "alpha shadow" option, and, if you use the direct lighting kernel, set the specular depht at 8.
with this setting you should see a clear glass with 1.5 ior in all the kernels
ciao beppe

[miohn]

Hi,

sorry, asked for this already,
but I really need some material setup tutorials!

For example:
- Where to place the "dirt" shader?
- For bump: should I add a "image texture" shader and
set the mode to "flow" or should I add a "float-shader" from the list?
- How do I get correct saturated colors? (c4d LW turning on does not change anything)
- "Shader to texture" how does it work - "which" c4d shaders are supported?

The manual just lists all the available octane shaders without telling
how th use them.

regards
MIke

[miohn]

btw: the "face shadow" option is not available
when double-clicking the material (open the mat-editor)

I searched and searched - its only visible in the attributes manager

regards
MIke

[amtberg]

I'm sorry for the false alarm. Stupidly, the glass object I was using to test this had the normals reversed. That's not a problem for Cinema's native glass shaders (which is why I didn't notice earlier), but it causes major problems with renderers like VRay and Octane.