any help for using Bump or Normal canal please

[clement]

Hi all ,

I'm facing some trouble when I try to use a simple black&white map in a bump or Normal canal .. is there something special to be able to use them ? (I tried loading the B&W image into an octane imagetexture shader , into a c4d normalizer shader , directly etc .. nothing works )

here a screen of what I get , using the displacement canal , the bump one and the normal one . Displacement 'works' ( but create small holes or polygons separations ) , it gives you the idea of what we should expect to see using the bump or normal canals .

thanks by advance .

[clement]

I've another question about the displacement : seems to works pretty nice in Directlighting but not in Pathtracing ?
here to screenshots .

( I made the displacement using a c4d layer shader, which contains my paint B&W map under a c4d transform shader which distort it a bit , and under a simple noise added .
and those corner edges have received a HN weight of 100% + a phong break command , to keep them sharpen .

so my questions are : can we use Pathtracing ( to be able to use SSS ) and Displacement together ? Why Octane can read my c4d layer shader correctly in the displacement tab , and can't read it in the bump or normal one ?

thanks for any input .

[TonyBoy]

I can see the displacement in the PT image but in the DL image, it's barely visible. I do know that Octane can't deal with Normal or Bump channels if Displacement is used. It would be nice if it could with finer detail in the Normal or Bump channel and greater displacement with a height map (think a denim material deformed by Displacement).

[aoktar]

Do you see this? I hope that's enough. Rest is not about plugins.

[clement]

thanks for the description Aoktar but what does it bring to my problem here ? I said I tested either Displacement only or Bump only or Normal only ..not all at the same time .

Displacement in DL works fine as I said , but not in PT .. why ?

bump doesn't see the c4d layer shader as Displacement (in DL) seems to see it .. why ?

(normal as bump doesn't see the c4d layer shader too .. why ?

I'm ok in not using the c4d layer shader if it doesn't work in octane .. but it works in the displacement canal .. ( and the c4d layer shader allows to distort etc some images .. I'd not know how to do this with octane shaders only )

[aoktar]

Actually this words would give much idea about how we do use C4D shaders. But anyway, It works on displacement, bump and normal. But i see that's very low res on your sample for bump/normal. Effect is barely visible. Increase the resolution for render to texture from "C4D Shader Render Size" in Octane material.

Second, B/W textures are not giving any good results on normal maps. Did you ever checked normal maps, they have vector values as RGB? See: https://en.wikipedia.org/wiki/Normal_mapping

Last one, i haven't heard that displacement choose the kernel. That's also not a plugin issue if that would be so. So i don't have an answer for Renderer's behaviour.

[clement]

thanks Aoktar ,

yes for the normal channel I used a 'normal' version of the B&W map . it's just about the layer shader which doesn't work .

For the displacement difference I got between DL or PT , it was the Ray Epsilon ( didn't know about this at all ) . Someone helped me with that on another forum . setting the RayEpsilon to 0.0001 , make the displace works nice whatever the kernel render choice .